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Modelling grid as porous media

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Old   April 2, 2019, 04:42
Default Modelling grid as porous media
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Iljar Dickhof
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Hello experts,

I'm trying to model a grid/grille as a porous media in CFX. However I've never worked with porous media before and I want to ask advice.

I've read you can fill in a resistance coefficient (linear/quadratic) to model the resistance but how can I calculate this coefficient if I only know the amount of holes and the area and thickness of the grid/grille.

Does someone have experience with this kind of problem?

Greetings,

Iljar Dickhof
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Old   April 2, 2019, 09:51
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Erik
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-Run a small simulation of one representative section of the grill. (one hole, or quarter hole if you can use symmetry)
-Construct a curve for pressure drop vs flow velocity.
-Calculate your linear and quadratic loss coefficients to fit this curve.
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