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Dynamic Pressure Inlet (turbulent flow)
Posted Dec 9, 2010, 5:52 a.m. EST Fluid & Heat, Computational Fluid Dynamics (CFD), Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.0a 1 Reply
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I have a question regarding a dynamic pressure inlet.
I have a large 3D model with several pressure inlets and one pressure outlet.
Some Informations:
- Comsol 4.0a
- Incompressible turbulent flow
- medium: air
Now I want to have dynamic pressure inlets, which also take Bernoulli (-1/2*rho*v^2) into account. Due to the fact, that I have several inlets the pressure gradients from each inlet to the outlet will change and therefore the velocity field.
I can run this model with a static pressure in- and outlet, which works pretty well. However it is impossible (not converging), when I implement a dynamic pressure inlet.
I tried the following thing:
- an integration variable for each inlet, e.g. v_mean = intop1(-w^2)/intop1(1) (depending on the inlet direction) in order to calculate the average velocity....
- inlet variable: p_in = p(static) - 1/2*rho*v_mean^2
It is for some reasons not working.
What is wrong, or are there any other possiblities to set a dynamic pressure inlet?
Thank you all in advance.
Regards,
Daniel
Hello Daniel Uhlmann
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Did you get any more information about your problem, i would like to also apply dynamic pressure on my model.
Thank you