Is it possible to introduce mesh motion in a domain that is defined as porous? There is a a pull-down menu for "Mesh Deformation" in the "General Options" tab, but unlike for a fluid domain, the only possible option seems to be "None", i.e. no mesh motion.

The combination of 'Mesh Deformation' and 'Porous Domain' is not yet supported (ANSYS CFX 11.0).
You should be able to setup a case with mesh motion, using a fluid domain, with a porous model set up via momentum sources in a subdomain instead.

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