Evaluate pressure loss exhaust system

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

Post by jureekelder2 » 04 Jan 2018, 16:35

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 of the problem
Geometry Meshed.PNG (24.17 KiB) Viewed 1860 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 field
velocity.PNG (72.89 KiB) Viewed 1860 times
Here are my Elmer files
.SIF and mesh files
(304.12 KiB) Downloaded 160 times
Do these results make any sense?
What would be your improvements?

In the end I want to make different geometries (change hole diameter, chamfer holes, plate porosity) and see which has the lowest pressure losss.

Thanks in advance,
Jur Eekelder

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