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mixedValue BC reads different Values than fixedGradient BC

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Old   September 15, 2017, 11:29
Default mixedValue BC reads different Values than fixedGradient BC
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Hi Guys!

I'm very new to the forum, but reading some of the threads here always helped a lot! Unfortunately I haven't found anything on my topic.

I am using the solidDisplacement Solver of OpenFOAM-2.3.x (but I couldn't find a solution for my problem on any newer or different Version).
Currently I am trying to "transform" the tractionDisplacement boundary condition, which is fixedGradient into mixedValue, so I can set a specific value at the boundary for certain conditions.
So I copied the code and changed the settings from fixedGradient to mixedValue (in the constructors part and .H file). I cut the codes, so nothing is calculated, but only the sigmaD value read and put out. I tried the code by just testing the following lines

Code:
    const fvPatchField<symmTensor>& sigmaD =
        patch().lookupPatchField<volSymmTensorField, symmTensor>("sigmaD");

Info << "sigmaD" << max((sigmaD)) << " min " << min((sigmaD)) << endl;
I made sure that the code doesn't do anything else, for both BCs fixedGradient and mixedValue. But unfortunately the sigmaD values vary a lot. While the fixedGradient BC is getting values between -7500 and +7500, the midexValue BC gets values between -2e+09 and +2e+08.

This seems very strange to me.

Can anybody help me? Did I miss anything with the constructors? Does that even influence the value?

lohoko
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