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Unidirectional Porous Media applied to curved sufaces?

Question asked by guilherme silva on Mar 3, 2009
Latest reply on Jan 6, 2012 by Christian Schneider
Dear Flow Simulation Experts,

I would like to apply an unidirectional porous media to a curved heat exchanger. In theory, the unidirectional is appropriated because I have offset strip fins.
Can I do it?

The problem with unidirectional is that the main direction (X, Y, Z of Global Coordinate System) is not aligned to the flow path because it goes around a half circle. I tried to create an new coordinate system but it does not appear as an option to porous media editor.