Calculating gradient of the discontinuous scalar in Foam

Huihui Xiao · June 19, 2020, 09:48

Hello,

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.

shuxuejia · August 22, 2020, 01:20

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.

June 19, 2020, 09:48	Calculating gradient of the discontinuous scalar in Foam	#1
Huihui Xiao New Member Join Date: Mar 2020 Posts: 12 Rep Power: 6	Hello, 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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August 22, 2020, 01:20		#2
shuxuejia New Member dp Join Date: Jul 2020 Posts: 6 Rep Power: 6	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.