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Old   July 31, 2014, 09:29
Default fluid porous domain interface
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I am running a turbine stage (steady) together with a Porous domain that should be representative of a heat exchanger. Between the wheel and the HX there's a duct. For the porous domain I am using a directional loss model with the porosity parameters tuned (after an initial guess based on some empirical data) in order to get the expected pressure drop at the design mass flow rate. The idea is not to reproduce accurately the flow across the HX but to impose a reliable back pressure at the outlet of the duct, the component on which I am now focusing.

I have applied the fluid-porous interface (the meshes of the two domains overlap in that section)and I used General Connection with None Frame Change.

My first question is if it makes sense to use a porous domain in this case. I found a few tutorials using it for HX modelling but they were not related to turbomachinery simualtions.

Second, assuming the set up is correct, I find hard to interpret the results on the interface section. While I can see the jump in axial velocity for instance (higher at the HX inlet but similar radial trend), I don't understand the difference in the static pressure contours on the two sides of the interface. I would appreciate any comment or link/thread suggestions where I could read and understand better about this. Many thanks in advance

Fluid Porous interface.jpg
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