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
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