GPU-Accelerated Regularized LBM with Curved Boundaries: Confine ment Effects on Cylinder Wake Dynamics

Abstract

We present the curved boundary condition for the moments-based regularized lattice Boltzmann (MRLBM) framework in two-dimensional (2D) coordinates. The solver is based on the Bhatnagar-Gross-Krook (BGK) collision model with D2Q9 lattice stencils and developed on the GPU-architecture using CUDA leveraging the inherent locality of the LBM. The accuracy and capability of the solver in handling curved geometries is validated for the canonical benchmark problem of flow past a cylinder inside a channel considering the wall effects. A moments based curved boundary condition is formulated to handle complex geometries on a uniform Cartesian grid, and the