26.2.3 Choosing the Pressure Interpolation Scheme

As discussed in this section in the separate Theory Guide , a number of pressure interpolation schemes are available when the pressure-based solver is used in ANSYS FLUENT. For most cases the "standard'' scheme is acceptable, but some types of models may benefit from one of the other schemes:

• For problems involving large body forces, the body-force-weighted scheme is recommended.

• For flows with high swirl numbers, high-Rayleigh-number natural convection, high-speed rotating flows, flows involving porous media, and flows in strongly curved domains, use the PRESTO! scheme.

• For compressible flows, the second-order scheme is recommended.

• Use the second-order scheme for improved accuracy when one of the other schemes is not applicable.

  The second-order scheme cannot be used with porous media or porous jump.

  Only PRESTO! and body-force-weighted schemes are available for the VOF model.

Note that you will not specify the pressure interpolation scheme if you are using the Eulerian multiphase model. ANSYS FLUENT will use the solution method described in this section in the separate Theory Guide for Eulerian multiphase calculations.