Artificial compressibility method using bulk viscosity term for an unsteady incompressible flow simulation

We introduced bulk viscosity term into the artificial compressibility method (ACM) for unsteady incompressible flow simulation to improve the efficiency of ACM. The stability, accuracy and computational effort were investigated by changing the Mach number, grid resolution and discretization method to clarify the bulk viscosity effects. ACM with bulk viscosity term (BVACM) could improve the stability and the accuracy of the ACM simulation especially for the coarse grid case. As a result, BVACM was 5.94 times faster than ACM within a permissible error of 5 percent. The three-dimensional flow structure of decaying isotropic turbulence, lid-driven cavity flow, channel flow were efficiently solved by BVACM using parallel computation.