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nonuniform boundary condition( U=f(y) ) ?

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Old   November 5, 2009, 06:47
Default nonuniform boundary condition( U=f(y) ) ?
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Jiang
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Dear Foamers:
I want to use nonuniform boundary condition in flow inlet. the velocity is changing with height. That is U=f(y). How can I add this condition to inflow boundary condition ?
Thank you very much.
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Old   November 5, 2009, 10:48
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Ulrich Heck
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Hi Jiang

you can either look at the HotRoom example in the heatTransfer/buoyant* example. Here there is initial temperature field generated on a patch. Look at the setHotRoom.C-File and it will be quite clear how to do something similar for U.
Or take a look a the wiki:
http://openfoamwiki.net/index.php/Main_ContribOther
Here you find funkySetFields and groovyBC which also should solve your problem.

Ulrich
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Old   November 5, 2009, 13:28
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Ali Sh
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Here is the sample of boundary condition where your wall moving and you create a file (here called time-series) and add the speed for each time instant:
movingWall
{

type timeVaryingUniformFixedValue;
fileName "$FOAM_CASE/time-series";
outOfBounds clamp;
}
The format for time-series is:
(
(0.001 (Ux Uy Uz))
(0.0011 (0.0100075 0 0))
(0.0012 (0.0100089 0 0))
(0.0013 (0.0100105 0 0))
(0.0014 (0.0100121 0 0))
)
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