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Showing results 1 to 7 of 7 Search took 0.00 seconds. Search: Posts Made By: bigphil

Forum: OpenFOAM Programming & Development February 14, 2023, 05:14

Replies: 15 fvc::grad only gaussGrad Views: 6,889 Posted By bigphil The Gauss gradient is calculated face-by-face,... The Gauss gradient is calculated face-by-face, where the term at each face is equal and opposite for the two cells that share the face (called the "owner" and "neighbour" in OpenFOAM). So, for...

Forum: OpenFOAM Programming & Development August 25, 2015, 04:15

Replies: 15 fvc::grad only gaussGrad Views: 6,889 Posted By bigphil Hi Carla, The definition of the gradient in... Hi Carla, The definition of the gradient in OpenFOAM is given in Equation 2.3 (Page 25) of the Programmer's Guide (http://foam.sourceforge.net/docs/Guides-a4/ProgrammersGuide.pdf). Best, Philip

Forum: OpenFOAM Programming & Development April 16, 2014, 11:00

Replies: 15 fvc::grad only gaussGrad Views: 6,889 Posted By bigphil The volume integral is not considered when the... The volume integral is not considered when the gradient is calculated, as you may want a gradient for some other reason; the volume integral is performed when you add grad(p) to the momentum...

Forum: OpenFOAM Programming & Development April 16, 2014, 10:48

Replies: 15 fvc::grad only gaussGrad Views: 6,889 Posted By bigphil Using "grad(p) Gauss linear" calculates the cell... Using "grad(p) Gauss linear" calculates the cell gradient using the Gauss theorem, whereas "grad(p) leastSquares" calculates the cell gradient by fitting a 'least squares' plane, no need to...

Forum: OpenFOAM Programming & Development May 25, 2013, 07:04

Replies: 15 fvc::grad only gaussGrad Views: 6,889 Posted By bigphil Idefix, If you follow the trail of code from... Idefix, If you follow the trail of code from fvc::grad(volField) you can find where everything is calculated. In short, fvc::grad(volField) -> fvc::grad(volField, word) ->...

Forum: OpenFOAM Programming & Development May 24, 2013, 08:38

Replies: 15 fvc::grad only gaussGrad Views: 6,889 Posted By bigphil Hi, Gauss linear means that the gradient is... Hi, Gauss linear means that the gradient is calculated using the Gauss method (i.e. volume integrals are converted to surface integrals) and linear means that cell centre values are interpolated...

Forum: OpenFOAM Programming & Development January 29, 2012, 09:39

Replies: 15 fvc::grad only gaussGrad Views: 6,889 Posted By bigphil Hi, As far as I can see (in fvcGrad.C), ... Hi, As far as I can see (in fvcGrad.C), fvcGrad of a volumeField checks what gradScheme is specified (i.e. Gauss, leastSquares, etc.) and then uses that to calculate the grad. Philip

Showing results 1 to 7 of 7

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