Performance Comparison of Parallel PCISPH and WCSPH

In this report we present performance measurements of our parallel predictive-corrective incompressible SPH (PCISPH) implementation. PCISPH is an incompressible fluid simulation method based on the Lagrangian SPH model. In this method, incompressibility is enforced by using a prediction-correction scheme to determine the particle pressures. The information about density fluctuations is actively propagated through the fluid and pressure values are updated until the targeted density is satisfied. With this approach, the computational expenses of solving a pressure Poisson equation is avoided while still being able to use large time steps in the simulation. The results of our implementation show that the multi-threaded execution of both methods leads to another increase in speed-up of PCISPH over WCSPH of up to 40% compared to the single-threaded versions. We furthermore demonstrate that PCISPH can be applied to simulate compressible fluids, still outperforming a standard SPH solver with equal density fluctuations.