Simulations for gas-liquid two-phase flows and fluid-structure interactions are challenging topics in CFD, since the shapes of gas-liquid interfaces and solid surfaces are dynamically changing in time and space. We have developed two incompressible CFD codes based on weakly compressible schemes with Finite Volume Method and Lattice Boltzmann Method. The sound speed is artificially reduced and we accept a small compression within small velocity divergences. In addition, an AMR (Adaptive Mesh Refinement) method is employed to improve the computational efficiency drastically by assigning high-resolution mesh around moving interfaces. We have successfully implemented the octree-based AMR for GPU supercomputers and a dynamic domain partitioning to maintain the computational load balance. We demonstrate several applications: free swimming of dolphin/water strider, violent flag fluttering, debris flows including rocks and driftwoods and liquid films.
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