The Diffuse Bounce Back Condition for Lattice Boltzmann Method

Geng Liu, City College of New York
Petascale, Adaptive CFD

Abstract: The lattice Boltzmann method has been widely used in curved and moving boundary fluid simulations. A novel lattice Boltzmann scheme based on diffuse geometry is proposed to better solve these problems. The scheme is derived by directly incorporating the bounce back condition into the weak form of the streaming step of discretized Boltzmann equation. Although diffuse boundary is introduced, this scheme recovers exact bounce back condition at sharp boundary limit, regardless of the shapes and motions of the boundaries. In this talk the detailed derivation for the new scheme is explained and the benchmark problems are solved to test its accuracy and validity. The implementations of this work are parallelized and accelerated by MPI. The theory is then applied to fluid-particle-interaction problems.


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Meeting ID: 117541231 / Participant passcode: 2477