165 results about "Fluid simulation" patented technology

A method is disclosed for executing a physics simulation in a system comprising a computational platform, a main application stored in the computational platform, a secondary application stored in the computational platform, and a smoothed particle hydrodynamics (SPH) application programming interface (API) implemented in the computational platform. The method defines a SPH call in the SPH API, and by operation of the main application, invokes a software routine using the SPH call. Additionally, by operation of the secondary application, a state of the physics simulation is updated in response to the software routine.

The method provides a new fluid simulation technique that significantly reduces the non-physical dissipation of velocity using particles and derivative information. In solving the conventional Navier-Stokes equations, the method replace the advection part with a particle simulation. When swapping between the grid-based and particle-based simulators, the physical quantities such as the level set and velocity must be converted. A novel dissipation-suppressing conversion procedure that utilizes the derivative information stored in the particles as well as in the grid points is developed. Through several experiments, the proposed technique can reproduce the detailed movements of high-Reynolds-number fluids, such as droplets / bubbles, thin water sheets, and whirlpools. The increased accuracy in the advection, which forms the basis of the proposed technique, can also be used to produce better results in larger scale fluid simulations.

A fluid-flow simulation over a computer-generated surface is generated using a quasi-simultaneous technique. The simulation includes a fluid-flow mesh of inviscid and boundary-layer fluid cells. An initial fluid property for an inviscid fluid cell is determined using an inviscid fluid simulation that does not simulate fluid viscous effects. An initial boundary-layer fluid property a boundary-layer fluid cell is determined using the initial fluid property and a viscous fluid simulation that simulates fluid viscous effects. An updated boundary-layer fluid property is determined for the boundary-layer fluid cell using the initial fluid property, initial boundary-layer fluid property, and an interaction law. The interaction law approximates the inviscid fluid simulation using a matrix of aerodynamic influence coefficients computed using a two-dimensional surface panel technique and a fluid-property vector. An updated fluid property is determined for the inviscid fluid cell using the updated boundary-layer fluid property.

The invention discloses a parallel acceleration method and a system of a lattice Boltzmann method (LBM), which overcome the defect that an X86 server cluster is higher in consumption of time and the like for LBM treatment at present. The method comprises the steps that a CPU (Central Processing Unit) end determines macro parameters and initial values of the macro parameters of all lattice points of a grid, defines a data structure and a storage mode for storing equilibrium distribution functions of all the lattice points in all directions and the macro parameters of all the lattice points, computes the equilibrium distribution functions of all the lattice points in all the directions according to the macro parameters, and sets thread execution configuration of an inner core of an MIC (Many Integrated Core) card; an MIC end conducts parallel computation of migration and impact and parallel boundary processing according to the macro parameters, the initial values of the macro parameters, the thread execution configuration and the equilibrium distribution functions of all the lattice points of the grid in all the directions, and obtains a convergence status according to the equilibrium distribution functions of all the lattice points of the grid in all the directions. With the adoption of the method and the system, the processing property of the lattice Boltzmann method is improved, and the demand of fluid simulation is satisfied.

The invention relates to a parallel fluid simulation acceleration method based on a GPU (Graphics Processing Unit) cluster. Aiming at the characteristics of large fluid simulation calculated quantity and high degree of parallelism, an automatic parallel acceleration method is designed to carry out simulation and algorithm research on fluid. The invention provides and realizes a load-balancing algorithm between multiple GPUs and between multiple nodes in the same node. In a given space, a fluid simulation algorithm based on location is used to simulate physical action of the fluid, and the algorithm is accelerated through reducing branches and shrinking a neighbor region searching range. The space where the fluid is located is divided, each node processes one sub-space, and the corresponding sub-space is further divided in each node according to the quantity of GPUs, so that the parallelization of fluid simulation on the GPU cluster is completed.

Realistic sprays for simulated fluids are created by adding a set of spray particles to a boundary region just below the fluid surface. The fluid surface is determined by solving a level set equation for a zero level corresponding to the fluid surface. Additionally, the boundary region is determined by solving the level set equation for a non-zero level corresponding to a surface at the specified depth from the fluid surface. The set of spray particles inherit an initial state, for example a velocity, from the fluid simulation. Subsequent motion of the spray particles is determined according to a ballistic simulation, rather than a fluid simulation, thereby substantially reducing the computational burden required to animate the fluid. Spray particles that sink below a specified depth from the fluid surface are removed.

Fluid-flow simulation over a computer-generated aircraft surface is generated using inviscid and viscous simulations. A fluid-flow mesh of fluid cells is obtained. At least one inviscid fluid property for the fluid cells is determined using an inviscid fluid simulation that does not simulate fluid viscous effects. A set of intersecting fluid cells that intersects the aircraft surface are identified. One surface mesh polygon of the surface mesh is identified for each intersecting fluid cell. A boundary-layer prediction point for each identified surface mesh polygon is determined. At least one boundary-layer fluid property for each boundary-layer prediction point is determined using the at least one inviscid fluid property of the corresponding intersecting fluid cell and a boundary-layer simulation that simulates fluid viscous effects. At least one updated fluid property for at least one fluid cell is determined using the at least one boundary-layer fluid property and the inviscid fluid simulation.