high porosity values causing flow instability -- CFD Online Discussion Forums

August 11, 2019, 13:14	high porosity values causing flow instability	#1
ufocfd Senior Member Giles Richardson Join Date: Jun 2012 Location: Cambs UK Posts: 102 Rep Power: 14	I'm increasing the porosity values (below) in simpleFoam such that the porous media is causing quite low speed flow eg 0.5m/sec... but when I try to reduce the speed even more it becomes unstable. Is there any way to stabilise the porosity solver for very high values of "d"? d d [0 -2 0 0 0 0 0] (2.0e+09 1.0e+11 1.0e+11); // viscous f f [0 -1 0 0 0 0 0] (0 0 0); // inertia

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