149 results about "Fluid models" patented technology

A system and method of monitoring the fluid status of a patient. The system may include a patient monitor that receives blood pressure data. A first fluid model receives the blood pressure data, and a personalized fluid model is derived from the application of the blood pressure data to the first fluid model. An estimation of the patient's fluid status may be derived from the personalized fluid model. The method may include the steps of measuring a first blood pressure value, creating a personalized fluid model, measuring a second blood pressure value, applying the second blood pressure value to the personalized fluid model; and deriving an estimation of the fluid status of the patient.

Formation fluid data based on measurements taken downhole under natural conditions is utilized to help identify reservoir compartments. A geological model of the reservoir including expected pressure and temperature conditions is integrated with a predicted fluid model fitted to measured composition and PVT data on reservoir fluid samples or representative analog. Synthetic downhole fluid analysis (DFA) logs created from the predictive fluid model can be displayed along the proposed borehole trajectory by geological modeling software prior to data acquisition. During a downhole fluid sampling operation, actual measurements can be displayed next to the predicted logs. If agreement exists between the predicted and measured fluid samples, the geologic and fluid models are validated. However, if there is a discrepancy between the predicted and measured fluid samples, the geological model and the fluid model need to be re-analyzed, e.g., to identify reservoir fluid compartments. A quantitative comparative analysis of the sampled fluids can be performed against other samples in the same borehole or in different boreholes in the field or region to calculate the statistical similarity of the fluids, and thus the possible connectivity between two or more reservoir regions.

A computer system and method are disclosed for automatically generating a vascular model of a blood vessel to support, for example, identification of mechanical factors corresponding to the blood vessel. The method includes interpolating data points corresponding to a contour of the blood vessel; generating a structural model representing three-dimensional structural characteristics of the blood vessel based on interpolated contours; generating a fluid model representing three-dimensional characteristics of fluid flow within the vessel; and generating a vascular model based on the structural model and the fluid model. The method may also include performing a mechanical analysis of the vascular model to identify a mechanical factor associated with the vessel, for example, a factor associated with a potential plaque rupture within the vessel. Embodiments of the invention are applicable to the diagnosis, assessment, or treatment of cardiovascular diseases.

The present invention provides a method, a system and a program storage device containing instructions for simulating the flow of fluid in a physical system using a composition-based extensible object-oriented program. A computer program includes: (i) a framework subsystem providing a graph package, a compute package and a property package; (ii) an engine subsystem including engine subsystem packages for performing numerical simulation, the engine subsystem packages including a linear solver package and a non-linear solver package; and (iii) a set of model components providing physical and numerical modeling behaviors utilized by the engine subsystem, the model components including at least one of a reservoir model, a well model, an aquifer model, a fluid model and a SCAL model. The framework subsystem, the engine subsystem and the model components work with one other to simulate the flow of fluid. Preferably, a partition package is used to create a partition of subsets of node and edge indices which can be used optimize computations by the program.

The invention relates to a flight icing numerical value simulation method of a helicopter rotor wing. The flight icing numerical value simulation method is mainly characterized by comprising the following steps that: a vorticity compensation force algorithm is added into a momentum equation and an energy equation in a single fluid model used for vortex movement used for simulating air-super cold water drop two-phase flows under a rotating coordinate system in rotor wing trail traces, and a centrifugal force and geostrophic force algorithm is added into a super cold water drop sliding velocity equation; a water film movement and icing model of the centrifugal force and the geostrophic force is considered; and the algorithms and the models are used for carrying out the flight icing numerical value simulation flow process of the helicopter rotor wing, wherein the model of single fluid two-phase flowing used for simulating the simulating air-super cold water drop movement is realized by a partial differential equation group for describing the movement of air and air-super cold water drop binary mixtures in a rotor wing tail trace flow field, and a two-phase flow slipping speed model. The condition that the quality and energy changes are generated in water films and ice layers because of the rotary movement of the rotor wing is considered in the model of the water film movement and icing process on the rotor wing surface, and the icing shape of the rotor wing surface is obtained.

The invention provides a rock longitudinal wave speed prediction method based on an ellipsoid double porosity model. The method comprises the following steps: rock physical parameters are obtained by acquiring well-logging data and experimental observation data, and a dry skeleton model and a porosity fluid model of the rock are generated; a double porosity medium ellipsoid plaque saturation model is established, the potential energy / kinetic energy of the porosity medium and kinetic energy and dissipative equation of the fluid in an inner embedded body are calculation, an Lagrange equation system is derived, and the longitudinal wave and transverse wave speeds are solved; according to the plane wave analysis method, the dispersion relationship of the wave equations is obtained, and the longitudinal wave speed dispersion and attenuation computational formula is obtained. According to the invention, the rock longitudinal wave speed prediction accuracy can be improved.

The invention discloses a numerical simulation method for aircraft flight icing, which simulates the state of an aircraft encountering icing during flying. The method is mainly characterized by comprising an algorithm of the velocity resolution and the water film thickness of a wall surface water film surface in a single-fluid model used for simulating two phase flow flowing of air-ultracold water drop, an algorithm for tracking an icing interface through mesh refinement method in a water film icing state model for calculating ice layer shape and internal temperature, and a flow based on fixed computational grids and used for performing flight icing numerical simulation calculation through the models and the algorithms.

The invention provides a wind farm predicted wind speed correction method and a wind farm predicted wind speed correction device. The wind farm predicted wind speed correction method comprises steps that a plurality of conventional wind farm wind speed deviation matrixes are established, and wind speed deviations represent differences between the predicted wind speeds of the target wind measuring masts of the conventional wind farms and actual measured wind speeds; based on the plurality of conventional wind farm wind speed deviation matrixes, a wind speed deviation correction model database is established, and comprises a plurality of wind speed deviation correction models corresponding to the conventional wind farms, and the wind speed deviation correction models represent relations between the wind speed deviations of the conventional wind farms and equivalent factors; related parameters of a target wind farm are determined, and according to the related parameters, the matched wind speed deviation correction model is determined in the wind speed deviation correction model database, and then the predicted wind speed of the target wind farm is corrected according to the determined wind speed deviation correction model. Errors generated during the calculation of the wind speeds of the wind farms by using conventional fluid models are effectively remedied.

The invention discloses a fluid video composition method based on stationary images, and belongs to the computer technology field. The method comprises the following steps: building a three-dimensional model of the shifting, the spreading, the rotation and the water wave of a fluid according to the knowledge of hydromechanics; pre-processing images, including matting and separation of the images and complementary drawing of the background; projecting the three dimensional fluid model onto the separated images, and regulating parameters according to the requirement of a video editor in the process; composing video sequences and the complementarily drawn background image to generate new video sequences; and dynamically combining the new video sequences to obtain a continuous fluid dynamic video. The method can be conducted in steps, can ensure the convenient use, strong commonality and small calculation volume of video composition, and can conveniently edit and process stationary images containing fluid.

A method for performing simulation of a field having a subterranean formation, including: obtaining a three-dimensional (3D) porous solid image of a core sample, the core sample representing a portion of the field; generating a digital rock model from the solid image, the digital rock model describing a physical pore structure in the core sample; obtaining phase behavior data of fluids of the field; generating a digital fluid model of the fluids based on the phase behavior data, the digital fluid model describing a physical property of the fluid; performing, on a computer system and based on the digital rock model and the digital fluid model, simulations of the field by varying an input parameter for the simulations; and analyzing an output parameter generated by the simulations to determine an effect of varying the input parameter on the output parameter.

The invention discloses a numerical simulation method for hydraulic fracture of a core wall of a rock-fill dam. The numerical simulation method comprises the following steps of: establishing a double-axis numerical model of a particle discrete element according to a practical stress-strain curve of soil of the core wall obtained from an indoor plane strain test; establishing a core wall framework particle model according to mesomechanics parameters defined by a double-axis test of the particle discrete element; establishing a fluid model by virtue of a continuous medium model, and dispersing a control equation of of the fluid model; and simulating the hydraulic fracture by virtue of the core wall framework particle model and the fluid model. According to the numerical simulation method, on the basis of the mesomechanics parameters obtained from the indoor test, the practical mechanical property of the soil of the core wall is simulated, and the stress boundary condition of the core wall and the practical hydraulic pressure boundary condition of the upstream of the rock-fill dam are applied to conduct numerical simulation, thereby judging whether the hydraulic fracture of the core wall happens or not from a mesomechanics point of view. According to the simulation result, an improvement measure is provided in the aspects of construction or design to avoid the hydraulic fracture of the core wall, so that the numerical simulation method has guiding significance on practical engineering.

The invention belongs to the field of oil gas geophysical exploration and provides a sandstone rock physical modeling method for tight sandstones. The method comprises the steps of constructing a rock core matrix model; constructing a rock framework model; constructing a rock fluid-containing model; and predicting the elastic properties of rocks. The invention provides a novel compact sandstone rock physical model containing different porosity characteristics, wherein the quantitative relationship among the mineral composition, the porosity, the pore type, the fluidity-containing property and rock elasticity parameters is established. The rock core and well-logging data-based calibration fully proves the good application prospect of the model.

The invention relates to an intelligent simulation algorithm matching method for three-dimensional dynamic fluid. The intelligent simulation algorithm matching method includes: building fluid simulation algorithm libraries comprising an algorithm equation library, a fluid material library, a three-dimensional flow field library and a target fluid describing language; intelligently matching fluid simulation algorithms: setting the target fluid describing language, finding the describing language corresponding to given conditions from the algorithm equation library by a system according to input condition information and utilizing an algorithm equation mapped by the describing language as a matched simulation algorithm equation of a target fluid; rebuilding a three-dimensional dynamic fluid model in real time, drawing three-dimensional fluid, proving simulation effect of the fluid and analyzing accuracy and effectiveness of the algorithms and parameters; controlling parameter and algorithm reconstitution; establishing an intelligent learning mechanism of the fluid simulation algorithms, storing the intelligent learning mechanism into the algorithm library together with the reconstitution algorithms and parameters passing effect proving, and setting up a matching relation between the intelligent learning mechanism and the keyed-in conditional information describing the fluid to be as a matching algorithm alternative item in future similar occasions, so that the system can complete the optimum screening configuration through intelligent learning.

Model predictive control methods are disclosed which provide, among other things, efficient strategies for controlling heat-transfer to a fluid.

The invention discloses a temperature field simulated analysis method applied to a multi-disk dry brake under the comprehensive action of multiple physical fields. Firstly, a three-dimensional model of the brake is established by starting from the mechanism and movement principle of the multi-disk dry brake. Then according to the complementarity between a fluid field and the brake structure, a rough fluid model is established and then modified and cut, and thus a final fluid model is acquired. Then fluid region and solid region boundary conditions are computed, a heat-flux coupling analysis is performed, and a temperature distribution rule of the whole brake is acquired. At last, a thermo-solid coupling analysis is performed, and a temperature field-to-brake structure deformation parameter is acquired. The temperature field simulated analysis method can achieve the temperature field simulated analysis of the multi-disk dry brake under the comprehensive action of multiple physical fields, is more accurate and reliable than the traditional single temperature field analysis, adopts zonal solving and boundary coupling methods, thus optimizing the information flow among the physical fields, and thus, the simulation is simpler, the operation is convenient and the consumed time is greatly shortened.

A method and apparatus for the control of a system comprising of a plurality of items through the scheduling of actions and the allocation of resources is disclosed. Primary areas of utility include manufacturing systems, city wide vehicle traffic control, multiple project scheduling, communications networks and economic systems. The method and apparatus comprise modeling the parts in such a system as fluid, formulating the control problem as a continuous linear program, using a novel algorithm to solve it, displaying the fluid solution in a meaningful way, and using the fluid solution in the control of the system.

The invention discloses a diffusion frontal surface curtain grouting numerical simulation method based on cement slurry thixotropy and VOF calculation. The method comprises the following steps: establishing a three-dimensional geological model and a grouting hole model, and coupling the three-dimensional geological model with the grouting hole model to form a three-dimensional unified model; introducing the three-dimensional unified model to CFD calculation software, and dividing computational grids; building a cement slurry thixotropic fluid model, capturing a slurry diffusion frontal surface by the VOF method; achieving dam bed rock curtain grouting three-dimensional numerical simulation of the slurry diffusion frontal surface based on the cement slurry thixotropy and the VOF calculation under complex geological conditions. According to the method, the three-dimensional numerical simulation of the slurry diffusion frontal surface based on the cement slurry thixotropy and the VOF calculation is achieved under the complex geological conditions, the macroscopic effect is accurately known after the bedrock curtain grouting under the complicated geological conditions, and a precise numerical means is provided for forecast before the grouting or analysis after the grouting for dam curtain grouting.

The present invention is directed to a method of preparing aqueous fluids for use in a hydrocarbon well. The method includes analyzing a water sample to produce a profile including at least one analyte concentration of the water sample, inputting at least a portion of the profile into a formulation database, wherein the formulation database generates an fluid model including at least one recommendation for the fluid composition of the aqueous fluid for use in the hydrocarbon well.

The invention provides a method for simulating the flow of supercritical CO2 in displacement of natural gas with the supercritical CO2. The method comprises the following steps that: a three-dimensional geological model is established according to the geological characteristics of a gas reservoir; a fluid model is established through an improved state equation, so that the basic parameters of thefluid of the gas reservoir are determined; the diffusion coefficient of the CO2 is determined; the multi-component numerical simulation model of the displacement of the natural gas with the supercritical CO2, which considers diffusion, is established; and corresponding relations between different CO2 flooding quantities and natural gas production quantities are calculated through using the model.The present invention provides the new mathematical model and processing method to simulate the flow characteristics of the supercritical CO2 in the displacement of the natural gas with the supercritical CO2. Compared with a conventional numerical model, the model can better evaluate the flow characteristic of the CO2 in the displacement of the natural gas and the displacement effect of the CO2.

The invention belongs to the technical field of petroleum and natural gas geophysics, and particularly relates to an establishing method and application of a rock physical model of an unconventional tight sandstone reservoir. Experimental data of a lot of tight sandstone core samples is used, and on the basis of a equivalent medium theory, steps of establishing a rock skeleton model, establishinga mixed fluid model, establishing an isotropic saturated rock model and establishing a rock physical model of the unconventional tight sandstone reservoir are included. Thus, the rock physical characteristics of the e unconventional tight sandstone reservoir can be accurately represented, a theoretical basis is provided for optimization of a seismic reservoir prediction technology and seismic inversion quantitative interpretation, and the risk of seismic interpretation is reduced.

The invention provides a method for analyzing the whole process of soil slope landslide. According to the method, an ideal elastic-plastic solid model is adopted when the soil slope is in a small deformation state, so that the method can be suitable for stability analysis, and the model is automatically converted into a Bingham fluid model after the soil slope is unstable to generate a landslide,so that the method can be suitable for large deformation analysis of the landslide. The whole process analysis of the soil slope from stabilization to critical instability to instability sliding to final sedimentation is realized.

The invention discloses a waveguide device microwave gas discharge numerical simulation method. According to the method, a microwave gas discharge fluid model in a waveguide structure is built, accurate numerical analysis is performed on electron density, electron fluid velocity and average electron energy during gas breakdown, and accordingly, the law of changing of the electric field intensity and the electron density at different observation positions along with the time in the condition of gas discharge of waveguide devices in different geometric profile complicated structures. The modeling of waveguide devices in any complicated structures can be achieved based on the time domain spectral element method; the generated mass matrix is a block diagonal matrix, and an inverse matrix can be obtained directly, so that the calculation time is reduced greatly; meanwhile, by the aid of the numerical simulation method, the breakdown threshold obtained through electric field distribution and electron density inside the waveguide devices through repeated experiments can be prevented, and accordingly, the design period is shortened, the design cost is saved, and the method is quite applicable to effective simulation design and numerical simulation of waveguide devices with discontinuous structures.

The invention provides a method and system for measuring a flow characteristic of a biomass circulating fluidized bed boiler. The method comprises the step of establishing an Euler double-fluid model used for simulating the flow characteristic of the biomass circulating fluidized bed boiler, the step of establishing a full size model of the biomass circulating fluidized bed boiler according to structural parameters of the biomass circulating fluidized bed boiler, the step of carrying out grid dividing on the full size model of the biomass circulating fluidized bed boiler and establishing a grid model of the biomass circulating fluidized bed boiler, the step of obtaining gas parameters, particle parameters, boundary condition parameters and initial wind speed of the biomass circulating fluidized bed boiler, the step of simulating the gas-solid two-phase flowing process inside the biomass circulating fluidized bed boiler according to the parameters, the Euler double-fluid model and the grid model, and the step of measuring a gas-solid two-phase velocity field distributing rule inside a furnace according to the simulated flowing process to obtain the flow characteristic of the biomass circulating fluidized bed boiler. By means of the method and system for measuring the flow characteristic of the biomass circulating fluidized bed boiler, measurement cost can be reduced, and the measurement period is shortened.

A method and apparatus for the control of a system comprising of a plurality of items through the scheduling of actions and the allocation of resources is disclosed. Primary areas of utility include manufacturing systems, city wide vehicle traffic control, multiple project scheduling, communications networks and economic systems. The method and apparatus comprise modeling the parts in such a system as fluid, formulating the control problem as a continuous linear program, using a novel algorithm to solve it, displaying the fluid solution in a meaningful way, and using the fluid solution in the control of the system.

The invention relates to a simulation method of an upflow biological hydrogen production reactor flow field, and solves the problem of the existing upflow biological hydrogen production reactor that control parameter selection causes a flow state phenomenon which is not beneficial to mass transfer and biological fermentative degradation. The simulation method comprises the following steps: 1, dividing a reactor profile into grid cells; 2, establishing a two-dimensional computed field Euler-Euler three-phase fluid model; 3, establishing a glucose fermentative degradation dynamical model of the profile of the upflow biological hydrogen production reactor; 4, determining a boundary value condition and an initial condition; and 5, solving a coupling model to obtain the flow field data of each grid cell in the profile of the upflow biological hydrogen production reactor. The simulation method is applicable to the design field of the upflow biological hydrogen production reactor.

The invention discloses a method for establishing an internal leakage model of a vane type continuous rotary electro-hydraulic servomotor. The invention is intended to fill a blank field of an internal leakage mathematic model, which is based on numerical simulation and theoretical calculation in a micro clearance and in different working conditions, of the vane type continuous rotary electro-hydraulic servomotor, so as to establish an internal leakage model of a motor. The method for establishing the internal leakage model of the vane type continuous rotary electro-hydraulic servomotor comprises the following steps: step A, establishing internal leakage formulas of four positions of the motor; step B, analyzing four working conditions of the motor; step C, establishing a fluid model formed by enclosing a stator, a rotor, a vane and an oil distribution disc; step D, carrying out grid division on the four fluid models by using CFD (Computational Fluid Dynamics) software, importing files in CFX (Computational Fluid X) to simulate calculation in a stable state, and establishing solid models of the stator, the rotor, the vane and the oil distribution disc; step E, establishing a workflow chart in a WORKBENCH, and carrying out fluid-solid coupling analysis on the motor; step F, obtaining aberration nephograms of all components through the post processing by the WORKBENCH, substituting aberration nephograms of all the components into the corresponding formulas in step A, so that a leakage amount caused by an initial clearance and solid-fluid coupling deformation can be obtained.

The invention relates to a method and device for acquiring the viscosity and the density of drilling fluids in the drilling process. The method comprises the following steps of: arranging at least three pressure measuring equipment in a pitshaft, wherein the at least three pressure measuring equipment are positioned at different depths; acquiring the pressure values of the drilling fluids, which are measured by each pressure measuring equipment; selecting two groups of pressure measuring equipment from the at least three pressure measuring equipment, wherein each group includes two pressure measuring equipment; respectively building a fluid model of each group of pressure measuring equipment according to the pressure values of two drilling fluids, which are acquired by the each group of pressure measuring equipment, and the depth difference value between two pressure measuring equipment; and generating the viscosity and the density of the drilling fluids according to the two built fluid models.