How can I improve the convergence of calculations involving the use of porous media with a large pressure drop?

In calculations involving the use of porous media, the pressure tends to change rapidly in and around the porous regions of your model. Attempting to resolve these large pressure gradients through higher order discretization schemes such as second order may cause over and undershoots of the solution variables leading to poor convergence or even divergence of the calculation.

The PRESTO pressure interpolation scheme in FLUENT is specifically formulated to handle cases with large body forces such as pressure drops in porous media, high swirl numbers, large buoyancy forces, etc. and is the preferred choice for your application.

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