Abstract

A new compressible fluid flow Physics that takes into account the intrinsic compressibility of the fluid is implemented in COMSOL 6.2 using the Coefficient Form PDE in the Mathematics Interface. This Physics solves the standard Navier-Stokes equation along with a new continuity equation that relates the time dependent pressure inside a control volume to the divergence of the fluid flow in that volume. Results from the new Physics are compared with those from the incompressible fluid flow Physics in the standard COMSOL pre-built Laminar Flow CFD interface.