186 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 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 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 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 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 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 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 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 discloses a surface texturing bearing lean oil state lubricating oil distribution prediction method and system, and relates to the field of cylindrical roller bearing surface texturing, and the method comprises the steps: extracting a fluid domain from 1 / n of a simplified geometric model; the fluid domain is subjected to unstructured grid division and then imported into FLUENT software, a lubricating oil density cloud picture and a speed vector diagram in a lean oil state are obtained through the software, and then the oil flow density and the speed distribution condition of an inner raceway contact area of the cylindrical roller bearing containing the surface texture are obtained; and utilizing finite element software to perform fluid-solid coupling on the fluid domain subjected to unstructured mesh division and 1 / n of the simplified geometric model to obtain the oil film thickness of the surface texture, and further obtaining the oil film thickness distribution condition of the surface texture. According to the method, the oil flow density distribution and speed distribution condition of the inner raceway contact area of the cylindrical roller bearing containing the surface texture can be predicted, and the oil film thickness distribution condition of the surface texture can be predicted.

The invention belongs to the technical field of aircraft ground support facilities, and particularly relates to a fluid-solid coupling mechanical analysis method for a large-span aircraft ground agile protection structure. According to the method, on the basis of an arbitrary Lagrange-Euler (ALE) algorithm, by integrating HyperMesh pretreatment and an LS-DYNA solver, high-precision simulation of fluid-structure interaction response of the plane ground agile protection structure under the action of a wind load is achieved. Comprising the following steps: establishing an aircraft ground agile protection structure finite element model and carrying out component division and grid division; constructing a semi-cylindrical air drainage basin and setting fluid material attributes and boundary conditions; and defining a fluid-solid coupling interface, and carrying out explicit dynamic calculation by adopting a bidirectional coupling algorithm. According to the method, the problems of low simulation precision and poor convergence of a flexible large-span structure in a traditional method are effectively solved, the stress, deformation and stability of the plane ground agile protection structure at different wind speeds can be accurately evaluated, and a reliable basis is provided for wind resistance design and safety evaluation.

The invention provides an installation method of a back ridge reinforcing system, and belongs to the technical field of building construction.The installation method comprises the steps that a bent arc secondary keel matched with the curvature of a bent arc section is manufactured through a numerical control hot bending forming or thin plate lamination cold bending process, and a frame body supporting system verified through a pre-pressing test is built; a plane secondary keel and a composite back ridge with a tenon-and-mortise structure interface are installed, a fluid-solid coupling numerical model is established to simulate the concrete pouring process and optimize back ridge arrangement, and a continuous load transmission path from a bottom die to a frame body supporting system is formed through the bent arc secondary keel and the tenon-and-mortise structure interface. A layered symmetrical pouring mode is adopted, vertical rod settlement and back ridge strain are monitored in real time, and the technical problem that a formwork deforms and is unstable due to the fact that the space curved surface load of a special-shaped beam curved section formwork system is difficult to accurately transmit to a plane supporting system is solved.

The application provides a wing parachute structure finite element modeling method based on a cable membrane structure, establishes a wing parachute structure single air chamber geometric model; establishes a wing parachute structure primary chord direction folding model and a secondary chord direction folding model; attributes are given to the grid elements, wherein, a film element is selected for a canopy part in the wing parachute structure single air chamber geometric model, a string element is selected for a canopy rope part, and a penalty function method is used to process a contact collision problem between the film element and the string element; a fluid-solid coupling model is established, and wing parachute inflation and deployment simulation calculation is performed. The simulation efficiency is obviously improved, the wing parachute structure model is established and simulation calculation is performed, stress, strain and other parameters of the canopy and the canopy rope structure of the wing parachute can be obtained, and reliable reference is provided for engineering practice.

The invention belongs to the technical field of bridge wind vibration control, and discloses a fluid-solid coupling numerical calculation method for studying the control of a friction energy consumption device on the flutter of a large-span bridge, which comprises the following steps: compiling a user-defined function secondary development program by using a dynamic grid technology based on computational fluid dynamics software Fluent, and embedding the program into a solver for calculation. And a motion equation of a rigid main beam-friction energy consumption device coupling system in the wind field is established, fluid-solid coupling solving is achieved in the mode that rigid main beam motion and flow field motion are alternately solved, and vertical and torsional motion responses of the controlled main beam are obtained. Compared with a wind tunnel test method, the method has the advantages that various parameters and stress modes of the rigid main beam and the friction energy consumption device can be accurately set, full-scale simulation can be realized, rich information such as movement time history data of the main beam and a nearby flow field under various parameter conditions can be conveniently and safely obtained, vibration suppression mechanism analysis can be conveniently carried out, and the method is suitable for popularization and application. And the research difficulty, cost and risk are greatly reduced.

The invention discloses a method for predicting the dynamic fatigue life of a fused salt storage tank. The method can be used for simulating the stress and deformation conditions of the fused salt storage tank in the heat charging and discharging process and analyzing and predicting the fatigue life. The invention relates to the technical field of adiabatic compressed air energy storage, in particular to a dynamic fatigue life prediction method for a fused salt storage tank in a heat storage subsystem. According to the method, through finite element modeling, dynamic fluid-solid coupling simulation and cyclic loading calculation and in combination with the fatigue life prediction theory, the structural weak area of the tank body in the dynamic process is determined, and a theoretical basis is provided for structural optimization of the tank body. According to the invention, the stress-strain dynamic distribution rule of the fused salt storage tank in the salt charging and discharging process can be comprehensively simulated, so that the fatigue life of the storage tank under the cyclic load effect can be predicted, and the test cost can be saved for the structural optimization of the storage tank.

The application discloses a reaction flow and solid fluid coupling calculation method, equipment and medium, relates to the fluid coupling calculation technical field, and the method comprises the following steps: performing an estimation process and a correction process in a current time step of a current time cycle; comparing the difference between the result obtained in the last time step and the result obtained in the current time step; in the case of being less than a preset tolerance, entering the next time cycle until the number of time cycles reaches a preset number, and outputting the fluid coupling result; in the case of being greater than or equal to the preset tolerance, entering the next time step until it is determined that each difference is less than the preset tolerance. The application is used to solve the problem that the change of the solid is not considered when the fluid coupling is carried out in the prior art, resulting in low accuracy of the result obtained when the fluid coupling is calculated, and realizes accurate calculation of the fluid coupling by combining the mechanical interaction, thermal interaction and chemical reaction of the reaction flow and the solid.

The application provides a vertical shaft cutting head efficient design method and system, belongs to the technical field of underground coal mine transportation equipment, and comprises a modeling simulation module, a data processing module and an auxiliary module. The modeling simulation module generates a parameterized cutting head model according to input parameters and performs grid division, configures boundary conditions and control parameters required for simulation and performs fluid-solid coupling simulation; the data processing module automatically extracts a slagging index in a simulation result, and completes slagging performance analysis of the parameterized cutting head model; the auxiliary module establishes a working condition-performance-scheme template database, and selects a scheme template according to actual working condition requirements, and assists in realizing scheme integration and local fine adjustment of the scheme, and improves design efficiency. The application realizes whole-process automation and modular design, significantly reduces manual workload, and solves technical problems such as low modeling efficiency, repeated parameter setting and complicated data processing in existing cutting head design.

The invention provides a steam generator pipeline wear simulation method, system and device and a storage medium, and relates to the technical field of physical testing. The simulation method comprises the steps that a fluid-solid coupling model of the heat transfer tube bundle and the foreign matter is established, and the foreign matter model is set to be a rigid body dynamic mesh model; solving the fluid-solid coupling model to determine stress information and motion information of the foreign body model under the action of the flow field; and based on the instantaneous speed and the resistance, the accumulated wear depth of the foreign matter to the heat transfer tube bundle under the action of the flow field is determined. According to the simulation method, the foreign matter stress information is captured in real time in the foreign matter movement process, the foreign matter movement information is updated, meanwhile, the abrasion rate of the heat transfer tube bundle is synchronously calculated based on the foreign matter stress and movement information, and full-process real-time simulation of lifting resistance, displacement and the abrasion rate of the foreign matter in the simulation process is achieved; and the accuracy and the reliability of a wear depth simulation result are greatly improved.

The application discloses a kind of engine cooling fan assembly strength calculation method based on one-way fluid-solid coupling, comprising: the geometric model of cooling fan assembly is established;Utilize the finite element model of cooling fan assembly and external flow field generated by mesh division software;In structural analysis software, respectively, to cooling fan and fan support plate is endowed with material mechanics characteristics, and boundary condition is set;In computational fluid dynamics software, set the turbulence model and boundary condition of external flow field;Blade surface is set as fluid-solid coupling surface, first solve flow field using computational fluid dynamics software, pass blade surface pressure in calculation result to finite element software by interpolation, and finite element software is used as boundary condition to simulate and analyze the structural strength of cooling fan assembly, and obtain cooling fan assembly strength.The application improves the accuracy of the model and ensures the calculation efficiency by taking the aerodynamic pressure load on the blade as the boundary condition when predicting the structural strength of the cooling fan.

The invention discloses a synchronous dynamic measurement method for a surface boundary layer and an interstage flow field of an aero-engine rotor blade, and belongs to the technical field of mechanical testing of aero-engine / gas turbine impellers. According to the method, fluid-solid coupling numerical simulation is carried out on a to-be-tested rotor system under a given rotating speed and a given working condition, and arrangement positions and installation postures of a surface hot film, a hot wire probe or a dynamic probe and a strain gauge are determined; a synchronous measurement system composed of a surface hot film measurement channel, a hot wire / dynamic probe measurement channel, a strain gauge measurement channel, a synchronous phase locking device, a high-fidelity slip ring and a multi-channel data acquisition system is constructed; and synchronous dynamic measurement and conjoint analysis of a blade surface boundary layer, an interstage flow field and a blade vibration signal are realized. According to the method, high-precision three-field coupling data can be obtained, and a reliable basis is provided for fluid-structure interaction mechanism research and aeroelasticity and fatigue life design of a high-load aero-engine.

The application relates to the technical field of rail transit construction, and discloses a simulation method for shield mud film closed gas test, which comprises the following steps: S1: establishing a simulation system for the shield mud film closed gas test; S2: preparing mud according to requirements; S3: measuring the porosity, density, residual water content, water conductivity coefficient, elastic modulus, Poisson's ratio and water holding capacity parameters of the mud and stratum soil; S4: inputting the material parameters obtained in S3 into the simulation system for the shield mud film closed gas test, and then carrying out model verification by using a small amount of mud film closed gas test; and S5: carrying out simulation calculation and analysis. The application provides an indoor closed gas test simulation model based on the Biot poroelasticity theory and under the fluid-solid coupling condition, considers the different water holding capacity characteristics of mud films and strata, carries out model verification by using the gas migration law and seepage flow evolution data obtained through the indoor test, and realizes rapid evaluation of the mud film closed gas characteristics under complex geological conditions and shield parameter working conditions.

The invention provides an oil field well casing residual strength evaluation method and system based on numerical simulation, and relates to the technical field of oil field development casing safety evaluation. Based on the casing damage evaluation basic data of the target oil field block, establishing a block scale fluid-solid coupling numerical model reflecting an injection-production dynamic and formation mechanical response coupling relationship, and obtaining redistributed crustal stress field data around a shaft; redistributed crustal stress field data are used as boundary conditions, a three-dimensional coupling mechanical model containing a stratum, a cement sheath and a casing pipe is established in combination with the casing pipe structure and material parameters, and the stress distribution and the maximum equivalent stress of the casing pipe under the injection-production load effect are obtained through numerical simulation; and based on the maximum equivalent stress and the yield strength of the casing material, performing residual strength evaluation and damage risk grading on the casing according to the strength utilization rate and the residual strength coefficient. Therefore, the accuracy and the dynamic prediction capability of the residual strength evaluation of the oil field casing are improved, and a scientific decision basis is provided for casing damage treatment.

The invention provides a fluid-solid coupling experiment system for a vortex ring and a flexible body, and relates to the technical field of fluid-solid coupling experiments.The fluid-solid coupling experiment system for the vortex ring and the flexible body comprises an experiment cabin module and a push type vortex ring generation module, and the experiment cabin module comprises an experiment cabin body, a laser mechanism, the flexible body and a particle generator; the flexible body is hung in the middle of the experiment module body, the laser mechanisms are arranged on the two sides of the flexible body respectively, the particle generator is arranged outside the experiment module body, the output end of the particle generator is communicated with the interior of the experiment module body, and the push type vortex ring generation module is arranged on one side of the experiment module body. The propelling type vortex ring generation module is used for generating a vortex ring facing the flexible body in the experiment cabin body, and the experiment cabin body module and the propelling type vortex ring generation module are used for being arranged on an optical platform. According to the invention, the accuracy of the fluid-solid coupling experiment of the vortex ring and the flexible body can be effectively improved.

The invention records a risk assessment method for a shale oil and gas gathering and transportation pipeline, and the method comprises the following steps: S1, constructing a defect-containing pipeline model of the gathering and transportation pipeline in three-dimensional software, and endowing the defect-containing pipeline model with pipeline defect parameters; s2, inputting the defect-containing pipeline model into ANSYS, performing fluid-solid coupling calculation on the defect-containing pipeline model through the ANSYS, and outputting pipeline mechanical change characteristics based on pipeline defect parameters; s3, monitoring the internal bearing pressure P of the pipeline in real time, and dynamically comparing the internal bearing pressure P with the residual strength Pmax of the pipeline in real time to obtain Pgt; and when Pmax is greater than Pmax, judging that the pipeline is invalid. According to the method, ANSYS fluid-solid coupling calculation and the residual strength criterion are adopted, the influence mechanism of different pipeline defect parameters on pipeline failure can be systematically explored, data support is provided for pipeline design, material selection and engineering maintenance, the service life of the pipeline is effectively prolonged, and the sudden failure risk is reduced.

The invention discloses a proportion design method of a cement-based rock stratum modified material, and relates to the technical field of rock stratum modified materials. The method comprises the following steps: firstly, determining a component parameter range based on cement, an anti-dispersing agent, a reinforcing agent and a toughening agent, wherein the water-binder ratio is fixed to 0.6; determining an anti-dispersing agent mixing amount constraint through a response surface method in combination with hydrogeological conditions; a discrete element fluid-solid coupling simulation and response surface method is utilized, and rock mass structure parameters are combined to determine the doping amount constraint of a reinforcing agent and a toughening agent; then, by taking the lowest cost as a target, constructing a multivariable nonlinear optimization model to solve an optimal ratio; and finally, according to the on-site grouting effect, the ratio is dynamically optimized according to a set gradient lifting performance threshold value. According to the method, engineering conditions are quantified into rigid constraints, unification of performance and cost is achieved, the proportion has dynamic self-adaptability, and the reliability and economical efficiency of grouting engineering are improved.

The invention discloses a multi-channel injection system and method for an ultra-large rock core hydraulic fracturing experiment. The system comprises a three-dimensional injection array module, a modular injection panel, a variable impedance regulation and control unit, a dual-medium consistency injection module and a fluid-solid coupling compensation control unit. The method comprises the following steps: constructing a three-dimensional matrix type injection network, preparing sand-carrying fluid with uniform concentration, configuring initial fluid impedance to realize multi-channel flow matching, starting synchronous injection, monitoring pressure and stress signals in real time, and dynamically adjusting the impedance of each channel to compensate the heterogeneity of the rock core. And finally, a uniform and stable volumetric pressure field is formed and maintained in the ultra-large rock core, and meanwhile, the concentration deviation of the sand-carrying fluid between the channels is controlled within a preset threshold value. The technical problems that a pressure field in a large-scale rock core is not uniform, proppant conveying is not stable and multi-channel interference is not stable are solved, and the method is suitable for complex crack expansion and proppant laying mechanism research.