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Calculating gradient of the discontinuous scalar in Foam

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Old   June 19, 2020, 09:48
Default Calculating gradient of the discontinuous scalar in Foam
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I defined a scalar only in a portion of mesh (domian 1), and thus it is a discontinuous scalar at the interface which separate the whole domain (domain 1 and domain 2), now I need to calculate the gradient of this scalar, let call it "s".

My question is that whether I can still use the "fvc::gard()" to calculate the gradient (s)?

If not, could you please recommend another scheme in Openfoam to calculate it, many thanks.
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Old   August 22, 2020, 01:20
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Do you mean it is on the boundary of domain 1? if it is a boundary, you can use snGrad. However, since it is discontinuous, the gradient calculated on domain 1 and 2 may be different.
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gradient, interface

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