Divergence Operator

cute · August 17, 2016, 12:29

Dear members,

I am trying to find source code for discretizing divergent operator. I am checking doxygen documents but did not find any. I checked this but it does not have, what I am looking for.

(1) I am interested to find where is actual discretized mathematical form is implemented in a file or I am missing something here.

(2) I am also interested to know, how the flux is calculated. Is it calculated as geometric mean or the arithmetic mean at the face of the cell.

(3) I am trying to discretize div(D(X)*grad(X)), I am not sure how to implement this in openfoam. I am getting errors on this line. I am using like

Code:

fvm::div(DX*fvc::grad(X))

where DX and X is defined as volScalarField.

Looking for help solving above problems.

Thanks.

Jerryfan · August 17, 2016, 14:29

Hi cute,

For implicit div operation, there is no fvm::div(some vector field.) as of version 2.3.1. (I don't know about other versions. I only know 2.3.1) The correct way should be:
fvm::div(flux, some vector field).

August 17, 2016, 12:29	Divergence Operator	#1
cute Member anonymous Join Date: Mar 2016 Location: Canada Posts: 93 Rep Power: 10	Dear members, I am trying to find source code for discretizing divergent operator. I am checking doxygen documents but did not find any. I checked this but it does not have, what I am looking for. (1) I am interested to find where is actual discretized mathematical form is implemented in a file or I am missing something here. (2) I am also interested to know, how the flux is calculated. Is it calculated as geometric mean or the arithmetic mean at the face of the cell. (3) I am trying to discretize div(D(X)grad(X)), I am not sure how to implement this in openfoam. I am getting errors on this line. I am using like Code: fvm::div(DXfvc::grad(X)) where DX and X is defined as volScalarField. Looking for help solving above problems. Thanks.

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August 17, 2016, 14:29		#2
Jerryfan Member Jerry Join Date: Oct 2013 Location: Salt Lake City, UT, USA Posts: 52 Rep Power: 12	Hi cute, For implicit div operation, there is no fvm::div(some vector field.) as of version 2.3.1. (I don't know about other versions. I only know 2.3.1) The correct way should be: fvm::div(flux, some vector field).