[will321321]

Hi Gentlemen,

I am trying to simulate a simple duct work with perofrated plate and inorder to save calculation time I am trying to substitute the perforated plate with a porous media.

How do I calculate A & B inputs for porous media, A(kg/m^4) & B (kg/(sxm^3), with equation k=(A*V+B)/Density on the User Guide.

Questions:

1. Are A & B defined as the quadratic and linear resistance coeff. respectively?

2. What equation does FloEFD use for porous media? (is it DeltaP =- (inertial losses + Viscous losses)*Thickness)

Thank you in advance.

-will

[SOHYEON MUN]

Which CFD solver do you use to calculate it?

[will321321]

Hello SOHYEON MUN,

Sorry for the incomplete information above, I am using FloEFD.

-will

[Boris_M]

Hi Will,

1.
why do you want to use that model?
If you don't have any datasheet values that fir that model definition it will be more work that taking a small sample of the perforated plate in a seperate simulation where you run a range of flow rates and measure the pressure loss due to the perforated plate and use that then in the pressure loss vs. flow rate model of the porous media definition.

2.
It is part of the momentum and energy equation terms with the factor k you mentioned above. For more details please look into the documentation called "Technical References" that comes with the software.
But put simple, the loss of course relates to the thickness and area specified for a reference element and relates automatically then to the actual dimensions of the CAD model as EFD knows the dimensions etc.

I hope this helps,
Boris

[will321321]

Hi Boris,

Thank you so much for the input, I have already figured out the relationship between A and B and DeltaP equation, using experimental data, plotting Velocity vs Pressure Drop and graphing it to obtain a second order polynomial curve.

-will