270 results about "Fluid solid coupling" patented technology

The invention belongs to the technical field of tunnel construction geological disaster prevention and control, and discloses a multi-source data fused refined treatment decision-making method for a complex stratum disaster source, which comprises the following steps: collecting and fusing multi-source geological data, and constructing a three-dimensional geological model; generating a disaster source risk dynamic assessment and treatment scheme; based on a fluid-solid coupling similarity theory, verifying the preliminary treatment scheme by adopting a physical model test, and determining an optimal treatment scheme; the optimal treatment scheme is executed, and the treatment process is dynamically regulated and controlled; after treatment, the treatment effect is evaluated through posterior data, and the effect data is fed back to the three-dimensional geologic model and the knowledge base, so that the dynamic updating of the model and the self-learning of the decision-making system are realized. By the adoption of the treatment decision method, the problems that a traditional method depends on experience, information is one-sided, and treatment is extensive are solved, advanced accurate forecasting and refined and personalized treatment of complex stratum disaster sources are achieved, and the safety and efficiency of tunnel construction are remarkably improved.

The invention discloses a geological modeling, crack propagation and fluid-solid coupling production prediction integrated evaluation method, and relates to the field of multiple technologies, and the method comprises the steps: constructing a three-dimensional geological model of a deep shale gas reservoir; according to the construction model, the attribute model, the three-dimensional ground stress model and the rock mechanical parameter model, a hydraulic fracture model is constructed; based on the hydraulic fracture model and the three-dimensional geological model of the deep shale gas reservoir, establishing a fluid-solid coupling productivity simulation mathematical model of the deep shale gas reservoir; according to the fluid-solid coupling productivity simulation mathematical model of the deep shale gas reservoir, the fractured horizontal well yield of the shale gas reservoir is predicted, and a prediction result is comprehensively evaluated and optimized. According to the method, multiple links of geological modeling, fracture propagation simulation, fluid-solid coupling production prediction and the like are integrated, and the geological characteristics of the gas reservoir, the fracture propagation rule and the interaction between fluid flow and solid deformation are comprehensively considered, so that comprehensive evaluation and optimal development of the deep shale gas reservoir are realized.

The invention discloses a particle dynamic characteristic simulation method and device based on multi-scale fluid-solid coupling, and the method comprises the steps: generating a background grid according to a simulation flow field region, and generating a local grid according to the position of a target particle; inputting the solid domain parameter and the fluid domain parameter of the current time step into a fluid-solid coupling model, and outputting a target solid domain parameter and a target fluid domain parameter; judging whether a local grid needs to be regenerated or not; if yes, a new local grid is generated according to the target solid domain parameters, and solid domain parameters and fluid domain parameters of the new local grid are obtained to serve as input parameters of the next time step; if not, taking the target fluid domain parameter and the target solid domain parameter as input parameters of the next time step; and repeating the inputting and judging processes until the simulation duration is reached, and determining the dynamic characteristics of the solid particles according to the target solid domain parameters of each time step. According to the method, multi-scale fluid-solid coupling calculation can be accurately and efficiently carried out, so that dynamic characteristic simulation of target particles is effectively realized.

The invention relates to an optimization design method for a multi-fulcrum elastic ring supporting structure of an aero-engine rotor system, and belongs to the technical field of aero-engine vibration control and rotor dynamics simulation. Firstly, a finite element or lumped unit model is adopted to establish a coupling kinetic equation of a rotor and an elastic ring, and fluid-solid coupling factors such as inner and outer oil films of the elastic ring and orifice flow are considered; then, through critical rotating speed and vibration harmonic response analysis, sensitivity evaluation is carried out on rigidity and damping characteristics of different supporting positions, and target vibration reduction modes corresponding to all fulcrums are identified; then, coupling simulation and multi-objective optimization are carried out around the number of bosses of the elastic ring, the height of the bosses, the damping aperture, the thickness of a thin wall and other key structure parameters, and the optimal design meeting the vibration reduction requirement of a rotor system and the strength reliability requirement of the elastic ring is obtained through iteration; and finally, an optimization result is applied to structure manufacturing and assembling. The method can effectively reduce the vibration amplitude of the rotor when the rotor crosses the multi-order critical rotating speed.

The invention relates to the technical field of geomechanical simulation of tunnel engineering, in particular to a tunnel surrounding rock water immersion weakening fluid-solid coupling simulation method and system.The method comprises the steps that mechanical parameters and seepage parameters of typical tunnel surrounding rock materials are obtained, and then an evolution equation of water immersion equivalent strain along with time is constructed; constructing a water immersion equivalent strain-seepage parameter dynamic correlation model based on the evolution equation and the seepage parameters; a seepage-stress coupling elastic-plastic damage constitutive model is constructed on the basis of a water immersion equivalent strain dynamic evolution model, and coupling circulation of a seepage-stress-damage field under the influence of water immersion degradation is represented on the basis of the seepage-stress coupling elastic-plastic damage constitutive model. The technical blank that bidirectional strong coupling of a seepage field and a mechanical field under water immersion response cannot be realized in the prior art is filled, and a high-precision simulation technical scheme is provided for stability analysis of tunnel surrounding rock in a water-rich environment.

The invention relates to the technical field of geotechnical engineering disaster monitoring and early warning, and discloses a stratum rainfall seepage deformation coupling numerical simulation method and system and a storage medium, and the method comprises the steps: building a three-dimensional geologic model reflecting soft and hard rock interbed characteristics; converting the on-site rainfall data into hydraulic boundary conditions in real time; calculating a rock mass shear expansion volume change rate, determining a chemical damage acceleration factor, and updating a total damage variable; reconstructing a permeation tensor representing the dominant flow channel according to the space gradient of the damage variable; solving a fluid-solid coupling equation based on the permeability tensor, obtaining pore water pressure and calculating a displacement field; building a likelihood function by using field monitoring data to perform inversion correction on model parameters; and evaluating the stability based on the corrected calculation result and outputting an early warning signal. By constructing a mechanical coupling mechanism and a dominant flow channel model, precise simulation of a landslide evolution process in a complex geological environment is realized.

The invention provides a flow-induced vibration analysis method for a large top-exposed plane gate with high submerging water depth. The flow-induced vibration analysis method comprises the steps that a hydraulic parameter set and a gate structure parameter set corresponding to an ultrahigh submerging ratio submerging outflow working condition are obtained; constructing a three-dimensional fluid-structure interaction numerical model comprising a gate solid domain and a water flow fluid domain based on the hydraulic parameter set and the gate structure parameter set; calculating a pressure pulsation load component and a vortex-induced vibration load component distributed on the surface of the gate through the three-dimensional fluid-solid coupling numerical model; inputting the pressure pulsation load component and the vortex-induced vibration load component into a gate structure dynamics solver for transient response analysis, and outputting a gate vibration displacement distribution map and a key component dynamic stress data set; and generating a flow-induced vibration safety performance evaluation conclusion according to the vibration displacement distribution map and the key component dynamic stress data set. The operation reliability and safety of the large top-exposed plane gate under complex working conditions can be improved.

The invention relates to the technical field of intelligent control of heavy equipment, in particular to a hydraulic synchronous intelligent control system for segmented turnover of an overweight steel structure, and discloses the hydraulic synchronous intelligent control system for segmented turnover of the overweight steel structure. According to the system, full-field strain data of a structure surface is acquired by deploying a flexible grid sensor array, and a deformation gradient topological graph is constructed to identify an instability risk area. And a dynamic fluid network model of the hydraulic system is established, fluid-solid coupling simulation is carried out in combination with deformation characteristics, and pressure pulsation transmission paths under different control instructions are predicted. And the system dynamically optimizes a data sampling strategy and network model parameters according to a prediction path, generates a hydraulic cylinder coordination action instruction subjected to pressure balance verification, and finally drives an execution mechanism to complete turnover operation. According to the scheme, full-field real-time sensing of structural deformation and dynamic coupling prediction control of hydraulic fluid are achieved, and the safety and control precision of the overweight component in the turnover process are improved.

The invention discloses a three-dimensional fluid-solid coupling simulation method and device for a rod falling behavior of a control rod drive line, and relates to the technical field of simulation of the rod falling behavior of the control rod drive line. Fluid boundary updating in the rod falling process of the control rod is processed through a structural grid and dynamic grid layer laying technology on the basis of computational fluid dynamics and multi-body dynamics theories; a modal synthesis method and a Hertz contact model are adopted to solve the problems of flexibility and contact friction of a large-length-diameter-ratio moving part, key factors including fluid resistance and mechanical friction resistance influencing rod falling simulation accuracy are calculated, fluid-solid coupling is achieved through one-way data transmission, three-dimensional fluid-solid coupling of the rod falling behavior of the control rod drive wire is achieved, and the control rod drive wire rod falling simulation accuracy is improved. The accuracy of a simulation result is improved, the degree of dependence on a prototype test is reduced, and a technical basis is provided for researching the rod falling behavior of the reactor control rod drive wire.

The invention discloses a fluid-structure interaction numerical simulation method, device and equipment and a medium, and the method comprises the steps: selecting a fluid-structure interaction computational domain, generating a computational grid, and marking the computational domain according to fluid and solid distribution information; determining a solving time step length and a discrete format, and selecting a control equation set for solving, the control equation set comprising a continuity equation, a fluid dynamics equation, a solid dynamics equation and a phase transfer equation; and analyzing and displaying a solving result. According to the efficient fluid-solid coupling numerical simulation method, global unified calculation is achieved, explicit fluid-solid decoupling is not needed, a global fluid-solid coupling body kinetic equation is adopted, errors caused by fluid-solid decoupling processing in a traditional split-phase solving method are avoided, and the method does not need to depend on and repeatedly generate a complex body-fitted grid; the control equation is based on each phase conservation equation on a physical continuous domain and realizes interphase accurate association through an interface continuity condition, and the fluid-solid coupling problem can be accurately and quickly solved.

The invention discloses a morphology reconstruction method for a deposition layer of a ceramic matrix composite air film cooling structure, and belongs to the field of engineering thermophysics. According to the method, on the basis of traditional fluid-solid coupling heat transfer simulation, a track of dust particles on the surface of the ceramic-based composite material air film cooling structure is simulated in combination with a dispersed phase model, deposition layer thickness distribution characteristics are obtained, and after coordinate positions and normal vectors on surface grids are obtained through a user-defined function, the deposition layer thickness distribution characteristics are obtained. And directionally moving the coordinates at different positions of the component along the normal direction by the distance of the deposition thickness to obtain coordinate values of the surface of the sediment, and sequentially reconstructing the obtained coordinate point clouds into a polygonal mesh surface and a geometric model to obtain the geometric morphology of the reconstructed deposition layer. Therefore, the comprehensive cooling efficiency and attenuation characteristics of the ceramic-based composite material air film cooling structure under the influence of the deposited particles can be accurately calculated by simulating and analyzing the influence of the deposited layer on parameters such as flow characteristics and temperature distribution on the wall surface.

The invention relates to a rock multi-surface direct shear test system and method considering fluid-solid coupling, and relates to the field of rock mechanics and seepage mechanics. Comprising a true triaxial loading frame which is used as a supporting frame of a test system and is used for clamping a sample and realizing a true triaxial stress state; the shear loading device is arranged in the true triaxial loading frame and is used for independently applying a horizontal shear load; the seepage module is connected with the true triaxial loading frame and is used for feeding fluid into the surface of the sample; the data acquisition system is used for monitoring and recording stress, strain, displacement, acoustic emission signals and seepage parameters in the test process in real time; and the servo control system is used for coordinating and controlling static loading, shear loading and seepage processes. According to the invention, the loading precision is improved, more real test conditions are provided for safety assessment of deep rock mass engineering and geological disaster prevention and control, and the device has important engineering application value.

The invention discloses a flexible riser vibration response characteristic analysis method, and relates to the technical field of ocean engineering. According to the method, a flexible riser vibration model is established based on a vibration theoretical model and a fluid control equation for vibration analysis, a theoretical time domain response curve of the flexible riser is obtained through MATLAB calculation, and then a flexible riser three-dimensional simulation model is established in an ANSYS Workbench integrated simulation platform. According to the method, a flexible riser three-dimensional simulation model is constructed, material constitutive parameters, boundary conditions and load application of the flexible riser three-dimensional simulation model are configured, then simulation is performed in an ANSYS Workbench integrated simulation platform by using the flexible riser three-dimensional simulation model, bidirectional fluid-solid coupling analysis is performed by coupling a Fluent flow field system and a Transient Stratum module, the radial displacement time history of the flexible riser under a preset working condition is obtained, and the radial displacement time history of the flexible riser under the preset working condition is calculated. And extracting resonance characteristics of the flexible riser. According to the method, the vibration response characteristics of the deep-sea flexible riser under the influence of internal and external fluids in the service process are accurately obtained, and a foundation is laid for guiding the structural stability of a deep-sea operation system.

The invention provides a method for constructing a physical field of a horizontal axis water turbine blade of an agent model, and relates to the technical field of digital twinning. According to the method, rotating speed data of a water turbine under different flow velocity conditions are determined, and rotating speed values corresponding to all flow velocities are obtained; then, fluid-solid coupling simulation is carried out in combination with experimental data, and stress and deformation data of the water turbine blade under the actual operation working condition are further obtained; according to the method, the KNN algorithm is utilized to carry out order reduction processing on the obtained blade structure data, a plurality of grid points are combined into representative points, the calculation complexity is low, the processing requirement of graph rendering software on the data size in the real-time rendering process is met, a combined Kriging method is adopted to carry out digital twinning agent model training on the data after order reduction, and the real-time rendering efficiency is improved. The reconstruction of a real-time physical field of the blade is realized; iteratively optimizing the digital twin physical field proxy model according to a genetic algorithm, and solving the problem of deviation between the proxy physical field model and a real physical model; and finally, deploying the digital twin physical field agent model into a digital twin system and solving physical field distribution in real time.

The invention relates to the field of underwater pressurization, and discloses an underwater contra-rotating compressor blade tip leakage flow vibration prediction method and system based on fluid-solid coupling simulation, and the method comprises the steps: carrying out the division of flow field grids and the division of solid domain grids based on a constructed underwater contra-rotating compressor impeller three-dimensional model; establishing a blade flow field CFD model and a blade solid domain FEA model; aNSYS Fluent software is used for conducting underwater contra-rotating compressor three-dimensional unsteady blade flow field simulation so as to obtain unsteady blade tip leakage flow characteristics of a concerned flow field area; an external data module in ANSYS Workbench software is used for loading the aerodynamic force, obtained through unsteady flow simulation, of the surface of the blade to the surface of a blade solid domain FEA model, transmission of the aerodynamic force load between different blade surface grids is achieved, and one-way fluid-solid coupling is achieved; aNSYS Workbench software is used for conducting underwater counter-rotating compressor blade vibration simulation, vibration response of the blade under the combined action of aerodynamic force and centrifugal force is obtained, and the fatigue life of the blade is predicted based on a fatigue model.

The invention discloses a free vibration semi-analytical calculation method for a liquid filling functional gradient pipeline on an elastic foundation, and relates to the technical field of solid mechanics and fluid-solid coupling vibration analysis. The method comprises the following steps: acquiring materials, geometry and boundary parameters of a pipeline, a fluid and a foundation, establishing a fluid-solid coupling model based on a three-dimensional elastic theory, simulating foundation support by adopting a two-parameter Pasternak model, and deducing a control equation and boundary conditions of a pipeline structural domain and a fluid domain; discretizing a pipeline reference surface and a fluid boundary through a two-dimensional high-order spectrum unit, and converting an equation into a standard coordinate system in combination with proportional boundary coordinate transformation; proportional boundary finite element control equations of a structural domain and a fluid domain are deduced respectively and converted into a first-order differential equation set, then a fine integration method and an eigenvalue decomposition method are adopted for solving, and then based on a fluid-solid coupling condition coupling equation, the equation is converted into a generalized eigenvalue problem for solving the inherent frequency and the vibration mode. According to the method, only precision, efficiency and discrete boundaries are considered, and support is provided for pipeline design optimization and safety evaluation.

The invention discloses a high-pressure-difference self-balancing intelligent ball valve which comprises a pressure sensing module. A friction state detection module; an intelligent control processing unit; a pressure balance execution mechanism; a sealing surface microstructure adjusting mechanism; a multi-time scale control coordination module; the intelligent control processing unit executes a dynamic pressure self-adaptive balance control algorithm; the intelligent control processing unit executes a fluid-solid coupling friction coefficient self-optimization algorithm; according to the double algorithms, deep fusion and optimization control are realized through a multi-objective comprehensive optimization function, and an enhancement effect is formed to improve the overall performance of the system. The method has the following beneficial effects that through double-algorithm fusion, deep integration of a dynamic pressure adaptive balance control algorithm and a fluid-solid coupling friction coefficient self-optimization algorithm is achieved, and the performance of the ball valve under the high pressure difference condition is remarkably improved.

The invention relates to the technical field of rail transit construction, and discloses an analogue simulation method for a shield mud film gas check test, which comprises the following steps: S1, establishing an analogue simulation system for the shield mud film gas check test; s2, preparing slurry according to requirements; s3, measuring the porosity, density, residual moisture content, water conductivity coefficient, elastic modulus, Poisson's ratio and water holding capacity parameters of the slurry and the stratum soil body; s4, all the material parameters obtained in the S3 are substituted into an analogue simulation system of the shield mud film air closing test, and then a small amount of mud film air closing tests are used for carrying out model verification; and S5, carrying out simulation calculation analysis. According to the method, an indoor gas closing test simulation model is established on the basis of a Biot pore elasticity theory under a fluid-solid coupling condition, different water holding capacity characteristics of a mud film and a stratum are considered, and model verification is carried out through a gas migration rule and leakage flow evolution data obtained through an indoor test; and the rapid evaluation of the closeness characteristic of the mud film under complex geological conditions and shield parameter working conditions is realized.

In order to solve the problems of high calculation complexity and low efficiency in hydraulic fracturing numerical simulation, the invention provides a method for parallel simulation of hydraulic fracturing crack propagation. A three-dimensional fracture grid is constructed by adopting a displacement discontinuity method (DDM) and a finite volume method (FVM), and stress and fluid pressure distribution in fractures are calculated. Crack expansion is driven by optimizing DDM stress coefficient matrix generation and combining FVM to calculate crack tip pressure. OpenMP multi-thread scheduling and Intel MKL and Eigen library optimization are adopted, LU or QR decomposition is dynamically selected according to the matrix scale, and therefore the calculation efficiency is improved. According to the method, by initializing a three-dimensional fracture grid, optimizing a stress matrix, constructing a fluid-solid coupling equation set, carrying out iterative solution, checking convergence and generating a three-dimensional fracture expansion model, efficient fracture expansion simulation is achieved, and an efficient and accurate numerical tool is provided for fracture design of unconventional oil and gas reservoirs.

The invention discloses an ice load calculation method suitable for upward-floating icebreaking of an ultra-large vehicle in a layer ice environment, and the method comprises the steps: carrying out the grid division of a layer ice environment and an ultra-large UUV geometric model, and obtaining an ultra-large UUV upward-floating icebreaking calculation model; the floating icebreaking calculation model comprises a layer ice rink geometric model after grid division and an ultra-large UUV model after grid division; fluid-solid coupling relation definition is carried out on the floating icebreaking calculation model, multiphase fluid-solid coupling unified solution of a water area, an air area, an ice layer and a boat body is achieved, identification, separation and calculation of ice loads in the floating icebreaking process are completed under a unified solution framework, and therefore the stability, precision and engineering applicability of load results are remarkably improved; and performing simulation calculation on floating icebreaking of the ultra-large UUV under each working condition by using the floating icebreaking calculation model to obtain the ice load borne by the ultra-large UUV at each moment.

The invention provides a carbon dioxide geological sequestration assessment method and device based on fluid-solid coupling, and the method comprises the steps: generating a seepage simulation grid based on the collected field survey geological data of a target sequestration site; the simulation parameters corresponding to the seepage simulation grids in the current time period are input into a multiphase flow simulation tool, and seepage field data corresponding to the seepage simulation grids in the future time period are obtained; inputting pore pressure data and temperature in the seepage field data corresponding to each seepage simulation grid in the future time period into a solid mechanical simulator to obtain reservoir deformation data in the corresponding mechanical calculation grid in the future time period; and based on the seepage field data and the reservoir deformation data, generating evaluation information of the carbon dioxide geological sequestration. According to the method, the sealing safety and the reliability of efficiency evaluation are improved by utilizing a carbon dioxide sealing multi-physical field simulation technology coupled by a multiphase flow simulation tool and a solid mechanical simulator.

The invention relates to a post-fracture dynamic evolution diagnosis method based on distributed optical fiber strain sensing, and the method comprises the following steps: (1) building a segmented multi-cluster fractured reservoir model, and carrying out the spatial discrete processing of the model; (2) establishing a wellbore-reservoir-fracture fluid-solid coupling mathematical model and a numerical solution format considering fracture stress sensitivity; (3) on the basis of actual production dynamic data of the field fractured well of the oil and gas field, fluid-solid coupling numerical simulation of the production process of the fractured well is carried out, and strain signals at distributed optical fibers along the well are calculated; and (4) comparing the strain signal with an actual monitoring signal, adjusting the geometrical morphology and property parameters of each cluster of cracks, ensuring that the strain signal is matched with the monitoring signal, and realizing dynamic evolution interpretation of the fractured cracks. According to the method, the optical fiber sensing strain response and the fracture dynamic evolution of the multi-cluster fracture reservoir in the production period can be effectively represented, and the fracture dynamic evolution interpretation after fracturing is realized.

The invention discloses a risk control method for the influence of foundation pit dewatering excavation on an adjacent subway tunnel, and the method comprises the steps: constructing a three-dimensional fluid-solid coupling model which comprises an underground diaphragm wall, a supporting system and a subway tunnel; the rainfall excavation process is simulated step by step, and the tunnel displacement risk is evaluated; and risk control is carried out by optimizing a precipitation scheme, improving an excavation time sequence and strengthening monitoring feedback. According to the method, the three-dimensional fluid-solid coupling model is established, dynamic monitoring data feedback is combined, the comprehensive influence of bilateral foundation pit dewatering excavation on the subway tunnel is comprehensively evaluated, the evaluation precision and real-time performance are improved, and construction safety and subway operation stability are ensured.

The invention relates to the technical field of environmental pollution abatement, in particular to a new pollutant abatement effect digital twinborn deduction method and system, and the method comprises the steps: obtaining hydrogeological parameters and pollutant characteristic data of a polluted site; constructing a three-dimensional digital twinborn body of the polluted site; establishing a fluid-solid coupling calculation model of pollutant diffusion; collecting real-time monitoring data and inputting the data into the digital twin; constructing a multi-agent environment sensing system to sense a pollution state and dynamic characteristics; a treatment scheme is generated through deep reinforcement learning, wherein the treatment scheme comprises environment state space construction, pollution situation reasoning and treatment strategy optimization; determining a technical combination and parameter configuration of pollutant treatment; implementing treatment; an actual treatment effect is monitored and fed back; the digital twinborn and deep reinforcement learning model is calibrated, through fusion application of digital twinborn and multi-agent deep reinforcement learning, accurate prediction and optimal control are achieved, the treatment cost can be reduced by 30%-50%, and the treatment period can be shortened by 40%-60%.

The invention belongs to the field of gas storage safety evaluation, and particularly relates to a method for calculating the vibration mode and harmonic response process of a gas storage pressurization area pipeline. Comprising the following steps: dividing grids for a fluid domain and a solid domain of a three-dimensional model of a supercharged area pipeline and setting constraints; a pre-stress coupling wet mode method is adopted to carry out fluid-structure interaction statics analysis to obtain initial pre-stress, and then a multi-order vibration wet mode is calculated; and applying external excitation based on a wet mode result, and obtaining deformation and stress concentration conditions during vibration by using a direct complete harmonic response method. According to the method, multi-load coupling is considered, fine modeling is conducted on dangerous positions such as welding seams and supports and a high-pressure container, self-adaptive grid division and high-precision constraint are adopted, the pre-stress wet mode and a direct complete harmonic response analysis method are innovatively combined, the calculation accuracy is greatly improved, and the method is suitable for large-scale popularization and application. Powerful support is provided for design optimization, safety evaluation and maintenance of the pipeline in the pressurization area, the safety risk is reduced, and the system reliability is improved.

The invention discloses a wet clutch sliding friction state prediction method based on friction pair fluid-solid heat behavior calculation and a vehicle, and the method comprises the steps: carrying out the iterative calculation of the internal fluid-solid pressure, oil film thickness and rough contact area of a friction pair based on the structure and working condition parameters of a wet clutch through a fluid-solid bearing equation, and representing the fluid-solid coupling behavior of a friction gap; a heat-source-input-free heat balance equation and a contact temperature continuity equation are established in combination with physical property parameters, the sliding friction interface heat flow dynamic distribution proportion is calculated at the same time, and a wet clutch temperature field prediction model is established by superposing heat conduction characteristics; through a non-dominated sorting genetic algorithm, clutch dry friction test data and a rough torque model considering radial temperature difference are fused, a rough friction coefficient-temperature fitting equation is solved, and a temperature field prediction model is combined to achieve updating of rough friction coefficients under different thermal load characteristics; and rough torque and viscous torque are respectively solved by integrating fluid-solid heat behaviors of the wet clutch, and the rough torque and the viscous torque and the temperature field jointly represent the sliding friction state of the wet clutch.

The invention discloses a pump turbine flow-induced vibration multi-scale coupling calculation method, and belongs to the technical field of pump turbine fluid-solid coupling dynamics. According to the method, the gap flow effect is included in a multi-scale unsteady fluid-solid coupling analysis framework of the pump turbine, the gap drainage basin is included in three-dimensional modeling of the pump turbine, the three-dimensional model is subjected to grid division by adopting a multi-scale grid technology, and a small transition region is arranged between a movable guide vane and a rotating wheel, so that the gap flow effect is obtained. The transverse direction is consistent with a main runner grid, and the longitudinal direction corresponds to a gap grid, so that data coordination of large-scale and small-scale regions is realized. A fluid-solid coupling solving method of a bidirectional iteration strategy is adopted, a flow field and a structure field are solved respectively, a system coupling module carries out load transmission and coordinated updating in a residual weighting and node mapping mode, the physical consistency and numerical stability of coupling simulation are effectively improved, and the system performance is improved. The method has remarkable advantages in the aspects of improving simulation precision, enhancing calculation stability, improving design efficiency and the like.

The invention relates to the technical field of petroleum and natural gas drilling engineering, and particularly discloses a multi-field coupled complex fractured formation fracture width distribution inversion method, which is characterized in that a drilling fluid leakage model considering a fluid-solid coupling effect is constructed based on a porous elastic mechanics theory, and a roughness correction factor is introduced to correct a traditional cubic law; the application of the Darcy law in the matrix is perfected, a matrix and crack coupled drilling fluid leakage mathematical model is established, the influence rule of key parameters such as fluid viscosity, pressure difference and crack width on the drilling fluid leakage amount is obtained through numerical simulation, and on the basis, the drilling fluid leakage amount is calculated. According to the method, the crack width multiple linear regression inversion equation with the fluid viscosity, the pressure difference and the accumulated leakage as independent variables is established, the inversion equation has high prediction precision and practicability and can be used for rapidly and accurately inversing the crack width on site, and theoretical and technical supports are provided for multi-scale fractured formation leakage mechanism understanding and leakage prevention and control optimization.

The invention discloses a centrifugal pump vibration digital twinning method and system based on deep learning. The method comprises the steps that real-time working condition data and real-time vibration data of a centrifugal pump are obtained; constructing a fluid domain model and a solid domain model of the centrifugal pump, and performing fluid-solid coupling simulation based on the fluid domain model and the solid domain model to obtain vibration data under the extreme working condition; fusing the vibration data under the extreme working condition and the real-time vibration data to obtain fused vibration data; and on the basis of the real-time working condition data and the fused vibration data, an LSTM-CNN deep learning network model is constructed, and the LSTM-CNN deep learning network model is used for achieving mapping from the real-time working condition data to vibration response and obtaining the vibration acceleration of the centrifugal pump. According to the invention, through the LSTM-CNN hybrid deep learning model, a high-precision vibration prediction function is realized.

The invention provides an unconventional oil and gas reservoir heat-fluid-solid coupling numerical simulation method and system. The method comprises the steps that a multiphase numerical model of a coupling temperature field, a seepage field and a stress field is built; the multiphase numerical model is integrated with a Cahn-Hilliard equation, a heat conduction equation, a continuity equation, a Navier-Stokes equation and a mechanical equilibrium equation; determining a model computational domain of the multiphase numerical model; performing grid discretization processing on the model calculation domain and performing grid refinement processing on the peripheries of the mass flow inlet and the pressure outlet to obtain a plurality of grid units; inputting the environmental parameters and the initial condition parameters into the multiphase numerical model, controlling the multiphase numerical model to perform discrete calculation in each grid unit, judging whether a convergence condition is met or not, and if yes, updating the physical property parameters of the multiphase fluid according to the current temperature and pressure, and outputting a numerical simulation result of the unconventional oil and gas reservoir. According to the invention, the productivity prediction deviation can be reduced.