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Surface sensitivities and adjointShapeOptimizationFoam

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Old   March 17, 2016, 12:07
Question Surface sensitivities and adjointShapeOptimizationFoam
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Hi everyone.

I am realtively new in openFoam and I cannot figure it out how to calculate the surface sensitivities to improve the shape of my case. I previously looked for the answer in this forum, and I found
"
The ones at the adjointShapeOptimizationFoam are volumetric sensitivities (design variables = porosity). You can calculate the surface sensitivities very easily.
Just google surface sensitivities and you will definitely find it.

"
in the old thread http://www.cfd-online.com/Forums/ope...imization.html

Anyway, I have not been able to find the solution in google nor in the web. Can anyone tell me please how can I calculate them?

In addition to this, I am trying to use adjointShapeOptimizationFoam to improve the pressure loss in a laminar flow. As it is a SIMPLE-based algorithm, writing

simulationType laminar;
RAS
{
RasModel laminar;
turbulence off;
printCoeffs off;
}

within constant/turbulenceProperties should make it, but it does not. Where is my mistake?

Thank you very much for your time.
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Old   June 21, 2016, 18:53
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Hi,
which version of OF are you using? the file seems correct, could you send the error message you get?

Any advances on the adjoint surface sensitivities solver?
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Old   June 22, 2016, 09:40
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You need to program surface sensitivities into the solver. Which indeed is easily done and equals maybe two or three lines of code change. If you want to update your geometry on the other hand with these sensitivities you need some kind of mesh motion. You could use external software to do that and pass the sensitivities to it or use the mesh motion libraries inside openFoam. This needs a bit more knowledge and testing. Setting the simulation type to laminar works in my version. You can however also use
simulationType RASModel;
RAS
{
RasModel laminar;
turbulence off;
printCoeffs off;
}

which is identical.
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