[MarZ]

Hey guys,

i am writing a thesis for my master degree in engineering about a numerical simulation of incompressible flow for a welding process(simulation of the inert gas flow).
I am using Abaqus/CFD for the simulation and i have no real contact person for the software and CFD simulation in general, so i have to make many decisions by my own.
Is there someone who i can ask some questions/ who use abaqus for CFD simulation?
One important element of the simulation will be a sinter element. It will be handled as flow through a porous medium. I have a curve from the producer of the filter(sinter element), pressure loss over velocity of fluid. So i wanted to validate my model with this curve. The equation of the pressure loss cause of this filter is giving by:

first picture attached

In Abaqus there is this equation given to simulate porous flow:

second picture attached

v
is the extrinsic average or the superficial velocity vector, where the average is taken over a representative volume incorporating both the solid (matrix) and the fluid phases;

p
is the intrinsic average of the pressure (average taken only over the fluid-phase);

rho
is the density of the fluid;

müh
is the viscosity of the fluid;

epsilon
is the porosity (volume fraction of the fluid phase) of the porous medium; and

K
is the permeability of the porous medium.

I have all parameters for the modell but i dont understand how the abaqus model considers a length of the filter element. If i vary the length of the sinter element it will result in a different pressure loss. Which seems logical for me but i cant see how abaqus/CFD consider a length of the filterelement with this given equation.

And the tutorial for porous flow in abaqus is a little bit misleading. It says that i need to define a porous section. If i do he wont run. But if i only use the drag force feature in the wanted section and when i write the needed parameters into the fluid material properties then it run. Which seems weird cause the porosity is a property of the filter, not the fluid.

Thanks for your help

[MarZ]

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