Physical and non-physical mixture-based complex scene fluid-solid coupling efficient simulation method

A complex scene, fluid-structure coupling technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as the limitation of fluid-structure coupling simulation calculation efficiency

Inactive Publication Date: 2018-09-04
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the existing fluid-solid coupling simulation in the field of graphics is limited to a small scene scale due to the limitation of calculation efficiency, and it is impossible to simulate the effects of solid breaking and other effects during the coupling process, and proposes a physics-based Efficient simulation method of fluid-structure interaction in complex scenes mixed with non-physics

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  • Physical and non-physical mixture-based complex scene fluid-solid coupling efficient simulation method
  • Physical and non-physical mixture-based complex scene fluid-solid coupling efficient simulation method
  • Physical and non-physical mixture-based complex scene fluid-solid coupling efficient simulation method

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Embodiment 1

[0117] This embodiment is mainly used to illustrate the advantages of step 1) fluid simulation.

[0118] During the high-efficiency simulation of fluid-solid coupling in the present invention, at first the fluid is discretized into 2 kinds of particles: DFSPH particles and FLIP particles; when starting the simulation, the final speed of the last time slice of the FLIP particles in the interpolation neighborhood (during the initial simulation, the last time slice The final velocity can be selected from the preset initial velocity) to obtain the initial velocity of the DFSPH particle in the current time slice; then, the viscous incompressible fluid is accurately solved by the Divergence-free SPH (DFSPH) method with zero divergence Equation to get the final velocity and position of the DFSPH particles in the current time slice; finally, the final velocity and position of the FLIP particles in the current time slice are obtained by interpolating the final velocity of the DFSPH part...

Embodiment 2

[0158] This embodiment is mainly used to illustrate the advantages of solving the dynamic problem in step 2) fluid-solid coupling.

[0159] In the present invention, during fluid-solid coupling, the rigid body mass is evenly distributed to the rigid body particle collection on the surface of the rigid body; the rigid body particle collection is marked as a special SPH particle and added to the DFSPH particle collection in 1); by accumulating the rigid body particle collection The final position, velocity and rotation of the rigid body in the current time slice are obtained by solving the force and torque vectors; the position and velocity of the fluid particles are updated by the straight tree method to prevent penetrating the surface of the rigid body. The specific implementation process of this step is:

[0160] (16) Use the Poisson disk method to sample the surface of the rigid body to obtain the rigid body particle l;

[0161] (17) Mark the rigid body particle l as a spec...

Embodiment 3

[0191] This embodiment is mainly used to illustrate the technical effect that step A) can produce. This step is only performed when there is a solid that needs to be broken in the simulation scene (such as a dam that is broken after being hit by water, etc.), and it does not need to be performed if there is no such solid in the scene.

[0192] The solid contained in the simulated scene needs to be broken at a predetermined time, so when the predetermined time is reached, step A) is performed before step 2). Step A) is specifically:

[0193] Calculate the strain energy distribution of the solid surface at this moment; calculate all possible central point sets P by minimizing the strain energy distribution through the centroid Voronoi method; finally output the minimized central point set N as the distribution of broken fragments; use the generated fragments as a step 2) Rigid body. The specific implementation of this step is as follows:

[0194] A1) For a solid with a volume ...

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Abstract

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.

Description

technical field [0001] The invention relates to the field of particle-based fluid simulation and fluid-solid two-way coupling simulation, in particular to an efficient simulation method for fluid-solid coupling in complex scenes based on the mixture of physics and non-physics. Background technique [0002] In the field of graphics, the use of fluid-structure interaction methods is often accompanied by fluid simulation. From the calculation object, it can be divided into one-way solid-to-fluid coupling, one-way fluid-to-solid coupling and two-way coupling ). In the solid-fluid one-way coupling method, the solid moves according to the set state, and the fluid will not affect the movement path of the solid. Correspondingly, in the fluid-solid one-way coupling method, the influence of the fluid on the motion of the solid is determined by integrating the fluid pressure and torsional force on the contact surface. However, these two methods can only be used simply as the boundar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 陈晨阳赵建旺王章野
Owner ZHEJIANG UNIV
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