A colocated-grid, fully coupled algorithm for large eddy simulation of incompressible and compressible flows

摘要

A colocated-grid finite-volume scheme for large eddy simulation of both incompressible and compressible low-speed flows is presented. The compressible Navier-Stokes equations are solved in a fully coupled implicit manner with preconditioning to enable computation of incompressible flows. Basic central difference schemes were combined with the momentum-interpolation correction, adapted to a fully coupled approach, to overcome pressure-velocity decoupling problems typical of colocated-grid methods. The algorithm was validated by simulating driven cavity flows. For the large eddy simulation of an isotropic decaying turbulence, use of the dynamic model resulted in accumulation of energy at the smaller scales for the basic central difference schemes. Computations performed using the momentum-interpolation correction gave excellent agreement with the experimental data. The performance of the dynamic model was also much improved. [References: 27]