Video-based Fluid Surface Reconstruction And Fluid-solid Coupling Simulation

The movement of liquids (including liquid, gas, multiphase and mixed flow) are complex and fluid simulation is indispensable in engineering applications and theory study. Fluid simulation effects, such as rough sea, flood-lake bursts or debris flow disaster and so on hold a significant position in the field of film special effects, national defense technology, and disaster prevention. Conventional methods to create fluid animation are primarily resorting to physically-based simulation via numerical integration, whose performance is at low efficiency. Alternatively, video-based methods could easily reconstruct fluid surfaces, yet only one layer of surface geometric data is obtained and it is not able to realize two-way dynamic interaction with their surrounding environment in a physically-correct manner.In this paper the fluid surface’s height field corresponding to each video frame is estimated by using the shape-from-shading (SFS) method. Then the height field is utilized to calculate the velocity field by minimizing the energy function, where the shallow water model is adopted. Then the reconstructed data is treated as real data to drive the simulation. The surface particles (including 3D position and its velocity) are then employed to guide the spatial sampling of the entire volume underneath in the simulation phase. Second, the volume particles corresponding to each video frame are imported into the SPH system to couple with other virtual objects. The reconstructed data from next frame is adopted to correct the simulation scene to keep data consistency. The resulting animation approximates the reconstruction surface from the input video, and new physically-based coupling behaviors are also appended in local area. The whole coupling simulation is corrected by both reconstructed data and physical model.This paper has explored the combination of video-based fluid surface reconstruction and data-driven physically-based fluid simulation, which takes full advantage of the reconstructed data from input videos and SPH model is used to simulate fluid-solid coupling. Compared with traditional reconstruction and simulation methods, the fluid-solid coupling simulation is more closer to the fluid video data.