## Evaluate pressure loss exhaust system

Numerical methods and mathematical models of Elmer
jureekelder2
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### Evaluate pressure loss exhaust system

Dear all,

I am using Elmer to model the pressure loss due to the presence of a perforated plate. The system consists of a vertical plate with holes after which the air is sucked out vertically. Geometry of the problem
Geometry Meshed.PNG (24.17 KiB) Viewed 1864 times
I have some questions:
- Now I am using the SST k-omega turbulence model (better results than k-epsilon), is this model accurate enough for this purpose?
- In reality we want to achieve an exhaust air flow of about 7 m/s. The inlet is ambient air. What are the appropriate boundary conditions? I read that if atmospheric pressure is wanted than the BC Pressure = 0 can be applied?
- Is my mesh dense enough at the holes? If I understand correctly, if the mesh is dense enough the Noslip Wall BC = True option can be applied, in stead of using the Wall Law.
- What is the best procedure to evaluate the pressure loss?

This is the velocity field I obtain: Velocity field
velocity.PNG (72.89 KiB) Viewed 1864 times
Here are my Elmer files
elmerfiles.zip
.SIF and mesh files