Research On Key Technologies Of Realistic Fluid Re-simulation

Fluid simulation is a hotspot in the field of computer simulation, the classical simulation result is mainly obtained through the initialization of an existing physical model, further post-rendering is applied to acquire fluid scene with realistic lighting. While this method demands high-level hardware, to simulate realistic fluid with low-level hardware, the re-simulation method is necessary to research. This method gets the fluid movement trend in low-dimensional space and then realizes the details of the fluid through the physical attributes or geometric properties, which is not critical for the hardware.As used herein, re-simulation method is used to achieve realistic fluid re-simulation. To realize re-simulation, the accurate calculation of fluid velocity based on the laws of physics optimization is needed to be studied firstly, which obtains the initial velocity compliance with the visual effect through using the global-local strategy, under the constraint of the Shallow Water Equation (SWE), the accurate velocity having the laws of physics is obtained. With the accurate velocity, the fluid simulation model, Lattice Boltzmann Methods for Shallow Water (LBMSW), is chose to re-simulate fluid. Since the own characteristics of LBMSW, the details of fluid are missed when re-simulating, which cannot ensure the realistic demand, therefore, two kinds of realistic details simulation strategy are proposed. The two methods use hybrid particle LBMSW strategy and local adaptive strategy of physics data-driven to obtain realistic re-simulation results with details. To achieve realistic lighting effects consistent with the real appearance, explore a technique of recovery mixed Lambert-specular reflection illumination model by analyzing the information that fluid video contained. Fluid is not only reflected by diffuse, but also by specular in real-world, therefore, mixed illumination model can truly reflect the fluid lighting conditions.In this paper, the key techniques of realistic fluid re-simulation are studied well, the fluent experiments verify the validation of the proposed approach, which provides an effective solution for the fluid re-simulation and plays a catalytic role in promoting the application in the actual production and life and the further research in the field of fluid realistic re-simulation.