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okay, the Womersley solution validation

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Old   March 7, 2011, 23:46
Default okay, the Womersley solution validation
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nobody answers my last post. So I think I need to ask my question in another way.

I think people in this community already did validation against the theoritical solution a lot before.

My question is this:

I have a velocity inlet V(t)=cos(t), I use icoFoam as the solver, (as in the cavity tutorial), but I need to change the BC from constant inlet velocity to varying bc. How to do it then?

One answer I found online is oscillatingFixedValue:

http://openfoamwiki.net/index.php/Ma...tingFixedValue

But after checking the result, i do not think it is pure oscilating, instead, it is a function of sine together with a steady positive flow rate.

like

if I delete 1 from the above formular, there is simly no flow then.

I want a flow with back flow at some time steps.

Anybody knows what is wrong? or any other function instead of oscillatingFixedValue?

Thanks

Last edited by nobound; March 8, 2011 at 12:11.
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Old   March 8, 2011, 02:42
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Why are you applying this BC in the cavity, and not in pipe, or duct flow, as one would expect? What are your outflow boundary conditions?
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Old   March 8, 2011, 12:09
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it is a 3d pipe, the outlet BC is pressure is zero.
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