Prediction of vortex shedding from a circular cylinder using a volumetric Lattice-Boltzmann boundary approach

An extended boundary scheme based on the generalized volumetric boundary algorithm for Lattice-Boltzmann method (LBM) is proposed in this paper. This approach applies a local non-equilibrium based scattering correction to the outgoing particle distributions that bounced-back from a solid surface. The correction reduces the near wall numerical smearing when enforcing the no-slip boundary condition and leads to accurate prediction of flow separations on a curved surface. A set of quantitative numerical studies of flow past a circular cylinder at low Reynolds numbers is conducted. Important flow quantities that characterize the vortex shedding phenomena behind cylinder are accurately predicted.