Numerical Simulation of Solid-Gas-Liquid Multiphase Flow on GPU

Abstract

By using the programming language C++ AMP, we have developed a new computational code working on GPU to be capable to compute incompressible free-surface flows including 6 DoF solid objects. The present computational code based on the CLSVOF method has been combined with an immersed boundary method to express and capture solid surfaces accurately. We have demonstrated several multiphase simulations such as binary collision of liquid drops in zero gravity field, a single rising bubble in a viscous liquid, a collapse of water column, milk coronet formation, and falling solid objects onto a liquid surface. The present code developed conserves the volume of each phase during the process of such complex flows and it exhibits the accurate estimation of the surface normal force. The computational results for the binary collision of liquid drops and the rising bubble in the viscous liquid have exhibited good agreement in comparison with the previous experimental results. The numerical results for the various multiphase flow phenomena have been successfully computed with relatively high speed owing to the appropriate combined computation between GPU and CPU, and visualized together with a ray-tracing technique to reproduce a kind of real flow phenomena.