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CFX Multi Domain Interface numeric diffusion problems

CFX Multi Domain Interface numeric diffusion problems

CFX Multi Domain Interface numeric diffusion problems

(OP)
Hi,

I'm trying to model atmospheric flow through and around a forest canopy using a rectangle representing a porous canopy within a fluid domain.

I'm having trouble creating a suitable mesh that doesn't create numerical diffusion problems at the boundaries of the canopy domain.  I'm testing it by setting both domains up as fluid domains - so the canopy should be invisible, however I see disturbances in flow and pressure within the canopy domain which I deduce are due to numerical diffusion.  Initial testing with the same boundary conditions but a single homogenous domain works nicely.

I have tried various approaches to meshing and the best I can do appears to be to refine the mesh massively around the edges of the canopy which is computationally expensive.

Any hints gratefully accepted -more info available if it helps!

Tom

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