165 results about "Fluid simulation" patented technology

The invention provides a flow equalizer, which comprises seven to nineteen distributing pipes (2) and a flange short pipe (3). The distributing pipes (2) are arranged in the flange short pipe (3), an inlet flange (4) is arranged at one end of the flange short pipe (3), and an outlet flange (5) is arranged at the other end of the flange short pipe (3). The distributing pipes (2) are fixed in the flange short pipe (3) through a screw fixator (1). According to the characteristics of fluid, diameter, number and length and the like of the distributing pipes are determined by means of simulation of fluid simulation software and computation of computing software, and accordingly fluid can be stable in flowing states and uniform in distribution by the aid of the distributing pipes. In addition, the flow equalizer is suitable for pump inlets on some process conditions.

The invention discloses a fluid simulation method based on the Eulerian-Lagrangian coupling method. According to the aim of achieving efficient fluid simulation and the core idea of solving the N-S equation through the Eulerian method and the Lagrangian method to carry out fluid simulation, research is conducted through the multi-method coupling calculation method on the basis of SPH and LBM fluid simulation. Firstly, large-scale fluid field modeling is carried out through the LBM method based on Eulerian grids to build the main part of fluid simulation; then, simulation is carried out on fluid details such as spindrifts and water drops through the SPH method based on the Lagrangian particle idea, LBM fluid and SPH fluid are integrated by designing a coupling algorithm, and lifelike and rapid large-scale fluid simulation with details involved is achieved.

The invention provides a three-dimensional fluid simulation method based on a graphic processing unit (GPU). The method comprises the following steps of: acquiring and storing data information of a three-dimensional fluid to acquire the data information of the three-dimensional fluid; pre-processing the acquired data information of the three-dimensional fluid by the GPU to acquire a pre-processing result, and performing fluid simulation on the acquired data information of the three-dimensional fluid by the GPU to acquire a fluid simulation result of the data information of the three-dimensional fluid; and rendering the acquired fluid simulation result of the data information of the three-dimensional fluid to acquire a rendered fluid simulation result of the data information of the three-dimensional fluid. By the method, simple and real-time operation of the three-dimensional fluid simulation process can be realized.

A method of processing a rigid body interaction in a particle-based fluid simulation includes determining a collision direction based on a normal vector of a pair of input particles and confirming whether parent objects of the particles actually collide against each other after the determination, and calculating a perpendicular impulse based on properties of the parent objects when the collision is confirmed. The method further includes calculating a final collision based boundary force by applying a tangential friction force to the calculated perpendicular impulse to apply the final collision based boundary force to the respective particles.

The invention belongs to the technical field of computer simulation, and provides an SPH-algorithm-based fluid simulation method and device. The method comprises the steps of initializing a flow field to generate discrete particles; calculating the density of each particle in the current flow field; according to the density of each particle, calculating the physical property of each particle, wherein the physical property comprises the eddy current confinement of each particle; according to the physical property of each particle, calculating the speed variation rate of each particle; according to the speed variation rate of each particle, updating the speed and position of each particle. Due to the fact that eddy current confinement is combined with the SPH algorithm in a seamless mode, the detail representation of fluid simulated based on the SPH algorithm is enhanced, and the fluid simulation fidelity is improved.

The invention discloses a blade number optimization method of a hydraulic torque converter on the basis of a neural network and a complete machine. A blade number neural network model is established and is combined with a digital model of a complete machine system to optimize a blade number. The blade number optimization method comprises the following steps: taking the blade numbers of the pump impeller, the turbine and the guide wheel of the hydraulic torque converter as input variables; utilizing an orthogonal experiment method to reasonably arrange an experiment; taking a pump impeller torque and a turbine torque of three-dimensional fluid simulation as target vectors of a training sample of the neural network so as to determine the structure and the training sample of the natural network; in order to improve the design efficiency and the convergence precision of the natural network, importing a genetic algorithm to optimize the initial weight and the threshold value of the natural network, accurately predicting the performance of the hydraulic torque converter of a non-training sample set by the trained natural network; and combining the blade number neural network model with a digital model of the complete machine system to optimize the blade number. The method has an important engineering application value on improving the operation efficiency of the complete machine.

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.

The invention discloses a third-dimensional fluid simulation method referring to heat conduction and dynamic viscosity. The method comprises the steps that 1, discrete modeling is carried out on the heat conduction process in fluid and the heat conduction process between the fluid and the outside based on a smoothed particle hydrodynamics (SPH) model, and the phase change process is simulated according to the influence of enthalpy of phase change on the phase change temperature; 2, calculation of the dynamic viscosity is introduced to show details in the fluid motion process; 3, a PCISPH algorithm is called to complete the remaining fluid motion simulating process; 4, a GPU accelerating algorithm is utilized for processing the processes of heat conduction, phase change, fluid viscosity changes and the like in parallel on a compute unified device architecture (CUDA), and fast simulation of third-dimensional phase change fluid is achieved. By means of the method, the heat conduction process between different kinds of fluid and the outside and the viscosity change process of the fluid can be simulated really and efficiently, simulation details in an existing method are enhanced, and the sense of reality of fluid simulation is improved.

The invention discloses a low-altitude wind shear three-dimensional backscattering wave simulation method for an airborne meteorological radar. The low-altitude wind shear three-dimensional backscattering wave simulation method comprises the following steps: establishing a three-dimensional meshed computational domain by utilizing scene parameters including a scene range and boundary conditions; performing fluid simulation on the computational domain to generate original wind field data; correcting the original wind field data; establishing an simulation scene and reading the corrected wind field data according to settings of the scene parameters; according to the simulation scene, simulating low-altitude wind shear of the airborne meteorological radar, and performing coherence stack on scattering points within a radar beam to form a radar backscattering wave signal of a scanning direction; respectively updating airplane position information, corrected wind field data and radar beam angle scanning information by utilizing the airborne parameters, the scene parameters and the scanning parameters; judging whether the scanning is completed or not according to a scanning range of the radar parameters. The method can be used for truly reflecting meteorological characteristics of the wind shear three-dimensional backscattering wave signal, so that the simulation data is effective and reliable.

The invention relates to a hemodynamic parameter calculation method and system and an electronic device. The method comprises the following steps of A carrying out preliminary blood vessel segmentation on an original medical image; B extracting a blood vessel center line according to the preliminary blood vessel segmentation result; C calculating a blood vessel contour on a vertical plane along the blood vessel center line; D generating a three-dimensional model of the blood vessel at the intermediate difference value of the blood vessel contour; E gridding the three-dimensional model of the blood vessel to obtain model grid information; F quantifying fluid simulation parameters; and G solving a fluid mechanics equation according to the model grid information and the fluid simulation parameters to obtain the hemodynamic parameters. Compared with the prior art, the application has a complete blood vessel modeling system and a parameter calculation system, by which errors can be greatlyreduced compared with the prior art, and the precision and universality of blood vessel dynamics parameter calculation are integrally improved.

The invention discloses a fluid simulation method based on video reconstruction and eulerian model coupling. The fluid simulation method comprises the steps of 1) reconstructing a three-dimensional density field of each frame of a fluid according to an input video; 2) solving an N-S equation by adopting an eulerian method, and updating the speed field and density field of the fluid; 3) taking the reconstructed density field of adjacent two frames as prior information and taking the result of the eulerian method as correction to reconstruct a three-dimensional speed field of the fluid; and 4) guiding the eulerian fluid simulation by using the reconstructed density field and speed field to generate a new animation effect. By adoption of the fluid simulation method, the density field and the speed field of the fluid can be reconstructed with relatively high precision; and by tightly coupling the reconstructed data and a fluid geometrical model, a fluid animation effect which is more closer to an actual condition can be obtained, and controllable fluid details can be added.

A method for simulating digital watercolor image includes: receiving a background texture on a virtual canvas where a watercolor image will be painted; receiving parameters for fluid simulation; and creating brushstrokes by a mouse pointer's movement on the virtual canvas. Further, the method includes converting coordinates of the brushstrokes on the virtual canvas to fit into simulation grids; calculating movement of colors and water through the fluid simulation by using the parameters and the brushstrokes; and simulating the watercolor image based on the brushstrokes by using the calculated movement of the colors and water.

The invention discloses an aircraft full-automatic aerodynamic optimization method based on reinforcement learning and transfer learning. The method is used for solving the problem that an existing pneumatic optimization method is prone to falling into local optimization or low in convergence speed, manual intervention is excluded in the final high-precision optimization stage through the optimization method, and the optimization efficiency is further improved. According to the technical scheme, firstly, a reinforcement learning environment based on semi-empirical estimation and high-precisionfluid simulation is established; a reinforcement learning neural network is constructed; a reward function is set, the global optimization capability of reinforcement learning is utilized; in the network training process, optimization experience is extracted from a semi-experience estimation method and stored in network parameters; then, another reinforcement learning neural network is constructed, migration learning is used for migrating the extracted optimization experience to the network, then the network is applied to aerodynamic optimization based on high-precision fluid simulation, andfinally, high-precision design parameters with excellent aerodynamic performance are obtained by training the network. Compared with a background technology method, the method has the advantages thatthe convergence speed is increased, the strong global optimization capability is realized, and the engineering value for high-precision pneumatic optimization is very high.

The invention discloses a physical and non-physical mixture-based complex scene fluid-solid coupling efficient simulation method. The method comprises the steps of 1) performing incompressible fluid simulation, combining an Euler method and a Lagrange method, and proposing an implicit particle method-based zero-divergence smooth particle fluid dynamics method; 2) performing dynamics problem solving in fluid-solid coupling, subdividing a motion problem of a simulation object into three sub-problems according to object attributes, and solving the three sub-problems by using different methods respectively to realize a multi-dimensional classification combination computing framework; and 3) combining a strain energy density concept in fracture mechanics with Voronoi spatial segmentation to realize a physical perception-based crushing method. The simulation efficiency problem difficult to solve in complex fluid-solid coupling scene simulation is solved. Compared with a conventional fluid-solid coupling method, the method can simulate a fluid scene with richer details under the same system resources, and can meet the demand of simulating solid crushing under fluid impact.

The invention discloses a fluid simulation rendering method, relating to the technical field of computer image rendering. The fluid simulation rendering method comprises the steps of: A, converting a fluid flow field in a two-dimension or three-dimension space into a one-dimension fluid flow field by using a space filling curve; B, decomposing the one-dimension fluid flow field into components with different frequencies by using an empirical mode decomposition algorithm according to the importance of different areas in the flow field determined on the basis of user view points; C, performing simulation with different precisions on the components with different frequencies according to analysis results; and D, summing the simulation results of the components to obtain a total simulation result serving as output. According to the fluid simulation rendering method and device, the speed and the fineness of the fluid simulation rendering can be improved; meanwhile, the system resources can be effectively saved.

The invention provides an incompressible fluid simulation analysis method based on an inter-belt finite element and a Lagrange coordinate. The incompressible fluid simulation analysis method comprises the following steps: dividing a computational domain [omega] of two-dimensional incompressible fluid into Ne units according to a traditional finite element mesh, wherein each unit is [omega i]; and constructing a displacement interpolation field of the unit [omega i], constructing a dynamic differential equation of the fluid according to the displacement interpolation field, and solving the dynamic differential equation to obtain each physical parameter of the fluid so as to carry out the kinematic analysis of the fluid. The invention is characterized in that the displacement interpolation field is constructed by utilizing an inter-belt finite element method, and the dynamic differential equation of the fluid is obtained on the basis of a descriptive method of the Lagrange coordinate. The descriptive method of the Lagrange coordinate is combined with the finite element method to solve a problem of the motion simulation of incompressible fluid, and the invention aims to improve the calculation efficiency and precision of analysis by utilizing the advantages of the high precision of the inter-belt finite element and convenience in lower boundary processing and good universality of the Lagrange coordinate.

The invention discloses a tropical cyclone dynamic simulation method based on time-varying weather data, and belongs to the computer graphics related technology. The method mainly comprises a tropical cyclone modeling method based on the weather data, a cloud drawing algorithm method of multiple forward scatterings, and a tropical cyclone simulation algorithm method of a fluid based on a position, and the specific steps are as follows: first analyzing the time-varying weather data of the tropical cyclone to extract velocity field data for the fluid simulation use, extracting cloud intensity related data, establishing a particle model of a cloud at the same time, modeling graphic metadata suitable for the computer graphics drawing; and then vividly displaying the graphic metadata; and finally realizing the simulation display of the tropical cyclone in the weather data by use of the fluid simulation algorithm based on the position according to the established graphic model.

The invention relates to a simulative calculation method for an engine lubrication system. The method can better guide the design and the development of the lubrication system to improve the development efficiency and save the experimentation cost. Flow analysis is performed on the lubrication system by using a one-dimensional fluid simulation technology in the design method. The method comprisesthe following steps of: A, acquiring related data of each part of the lubrication system, and performing parametric processing; B, building a one-dimensional model; C, performing simulative calculation of different working conditions; and D, analyzing the calculation result, performing optimal design on the lubrication system when the design result does not reach the expectation, and repeating the steps till the calculation result reaches the design index. The simulative calculation method has unique advantages of low cost, high speed, complete data, capability of simulating various differentworking conditions and the like; by using strong functions of a computer and performing one-dimensional simulation on the lubrication system through commercial fluid software, pressure distribution, flow distribution, temperature distribution and the like of the lubrication system can be simulated at the initial stage of design; and by parameter optimization, optimal matching of parameters is obtained. The information acquired by simulation is more comprehensive compared with experimentation, and the simulation can be mutually verified and mutually supplemented with the experimentation. The development efficiency is improved, and massive experimentation cost is saved.

The invention discloses a method and a system for fluid simulation by using Boltzmann equation. The method for fluid simulation by using Boltzmann equation comprises the following steps: surface meshenvelope treatment; generating spatial Cartesian grids; full transient flow field calculation. This method calculates the molecular cluster density function of each point in the flow field at different time. The particle distribution function satisfies the lattice Boltzmann equation. The method for simulating a fluid by using the Boltzmann equation adopts a full-detail geometric model, does not need to be simplified, and ensures the authenticity and accuracy of the simulation result; full transient algorithm, accurate calculation of the real transient aerodynamic force; accurate solution of separated flow at hgh angle of attack (or stall state); time-marching explicit algorithm, so that there is no divergence problem in the solution process; high-precision automatic solution, so that no manual intervention is needed and high stability is achieved.