What is the difference between the density based and pressure based solver?

The pressure-based approach was historically developed for low-speed incompressible flows, while the density-based approach was mainly used for high-speed compressible flows.

Now both methods have been extended to solve and operate for a wide range of flow conditions ' incompressible to compressible. The density based approach may be more accurate in the case of high speed compressible flows in some cases.

In both methods the velocity field is obtained from the momentum equations.
In the density-based approach, the continuity equation is used to obtain the density field while the pressure field is determined from the equation of state.

In the pressure-based approach, the pressure field is extracted by solving a pressure or pressure correction equation which is obtained by manipulating continuity and momentum equations.

The pressure based solver may offer several model options that are not available with the density based method.

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