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Forum: OpenFOAM

February 7, 2023, 05:32

Replies: 7

gSum( ) vs sum()

Views: 10,080

Posted By bigphil

The total energy can be calculated as ...

The total energy can be calculated as

const volScalarField kineticEnergy("kineticEnergy", 0.5*magSqr(U));
const scalar totalKineticEnergy = gSum(kineticEnergy);

and the arithmetic...

Forum: OpenFOAM

June 1, 2018, 06:37

Replies: 7

gSum( ) vs sum()

Views: 10,080

Posted By bigphil

vf.dimensions(); will return the dimensions...

vf.dimensions();

will return the dimensions of the vf field.

As regards "vf[cellI] gives a very large value when the real value is very small as 1e-100": this should not be the case: if...

Forum: OpenFOAM

June 1, 2018, 04:21

Replies: 7

gSum( ) vs sum()

Views: 10,080

Posted By bigphil

Depending on the cells of interest, you could do...

Depending on the cells of interest, you could do something like this (assuming a volScalarField called "vf" exists; I am using a simple criterion but these can be changed to whatever you want):

...

Forum: OpenFOAM

November 2, 2010, 15:01

Replies: 7

gSum( ) vs sum()

Views: 10,080

Posted By bigphil

Hi, I think that gSum() is global sum, which...

Hi,

I think that gSum() is global sum, which means that gSum() sums over all the processors in a parallel run.

Philip

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