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March 3, 2020, 07:19 |
Correct surface normal velocity?
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#1 |
Member
Piotr Ładyński
Join Date: Apr 2017
Posts: 55
Rep Power: 9 |
I wanted to create fixed normal velocity BC on a curved surface (flow outwards the domain), but matching options don't seem to behave according to their descriprion.
I use openfoam.org 7 version, and there are 2 BCs i tried to use: surfaceNormalFixedValue surfaceNormalUniformFixedValue I don't think I understand what is the difference between them, but according to their description they both should provide Umagnitude*normalVector values on a given patch. I expect fixed 1.5 m/s velocity magnitude pointed outwards the domain, but the total magnitude is much larger, because surface tangent velocity component doesn't seem to be fixed [PICTURE ATTACHMENTS]. When you look at the points on my curved surface aligned with X axis they should have zero Ux components, but they clearly don't. My computations seem to act stable, calculation ends at ~1133 iterations. Is there any way to fix this? I expect no tangent component or at least very small tangent component. Last edited by piotr.mecht; March 4, 2020 at 01:53. |
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March 4, 2020, 04:17 |
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#2 |
Member
Piotr Ładyński
Join Date: Apr 2017
Posts: 55
Rep Power: 9 |
I used groovyBC from swak4foam with:
Code:
type groovyBC; variables "velocityMagnitude=1.5;"; valueExpression "velocityMagnitude*normal()"; value uniform (-1.06 -1.06 0); |
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