A finite-volume model for fluid flow and nonequilibrium heat transfer in conjugate fluid-porous domains using general unstructured grids

摘要

A numerical model for computing fluid flow and heat transfer, under the assumption of local thermal nonequilibrium, is proposed for use with general unstructured, nonorthogonal grids. This model introduces novel interface conditions which are physically-reasoned and ensure strong coupling between the pressure and velocity fields. Special attention is given to the numerical approximation of diffusive and advective fluxes, pressure forces in the momentum equations, pressure-velocity coupling, and gradient reconstruction at interfaces while maintaining second-order accuracy. The resulting model is very robust and is shown to produce physically reasonable results for high laminar Reynolds numbers on nonorthogonal grids.