CFD Online Discussion Forums

Average values on Boundary Conditions

Posted July 17, 2017 at 04:42 by kindle

Great example of profit from the Openfoam

Quote:

Originally Posted by bigphil

helloworld11,

patchIntegrate and patchAverage only operate on volScalarFields, so if you decompose your velocity field into its components first using foamCalc, i.e.

Code:

foamCalc components U

Then you can run patchAverage on each component:

Code:

patchAverage Ux myInlet

You can also use foamCalc to do other things like calculate the magnitude of a volVectorField:

Code:

foamCalc mag U

If you

...

kindle

New Member

Posted in programming, Post-processing

Views 1547 Comments 0 kindle is offline

relations between master and slave boundary condtions

Posted July 7, 2017 at 03:16 by kindle

Mapped boudnary condition?

Quote:

Originally Posted by wyldckat

Hi Vimal,

Of course! The mapped BC, I wasn't remembering it. One such tutorial is "incompressible/pisoFoam/les/pitzDailyMapped".
And as of OpenFOAM 2.2, you can find more details about boundary conditions and function objects here: http://foam.sourceforge.net/docs/cpp/modules.html

What you're looking for is in the section Coupled boundary Conditions

The general idea is that:

You define

...

kindle

New Member

Posted in programming

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Installation of OpenFOAM 2.3.0 / 2.3.x on RHEL 5.8 without root permissions

Posted July 7, 2017 at 03:08 by kindle
Updated July 10, 2017 at 03:55 by kindle (add the right way to check the interior mesh)

Take a look at the paraview setting.

Here is a page saying that to check the mesh inside a geometry (https://openfoamwiki.net/index.php/FAQ/Postprocessing). The right thing to do is not the clip nor the slice. But
1. load the case unchecking polyhedral decomposition
2. filter : Extract Cells by Region

Quote:

Originally Posted by niX1337

Hello Bruno,

my bad, I have no idea why it did not work for OF 2.3.1 ... but it worked perfectly with OF 2.3.x. That's why I guess I made a mistake

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kindle

New Member

Posted in Post-processing

Views 1389 Comments 0 kindle is offline

Function component in field

Posted June 9, 2017 at 04:10 by kindle
Updated June 9, 2017 at 12:05 by kindle

On the explaination of laplacianFoam
This is extracted from the blog dyfluid.com.

Code:

volVectorField gradT(fvc::grad(T));//创建gradT场，其值为fvc::grad(T)，即为∇T显性离散的值          
volScalarField gradTx        
(             IOobject             
              ("gradTx",
                 runTime.timeName(),
                 DimensionedFieldmesh,
                 IOobject::NO_READ,
                 IOobject::AUTO_WRITE

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kindle

New Member

Posted in programming

Views 1055 Comments 0 kindle is offline

Reology with Fortran program available

Posted June 7, 2017 at 12:11 by kindle

This phd on Reology may be interesting.
Code : http://www.vvpf.net/download.html

Here he talked about memory function and a big memory footprint which will need special treatment in programming.

Quote:

Originally Posted by JonW

Hi there again,
I see what you mean. I am pretty sure that this is not in OF. You have to program it your self

I just send you the paper you asked, and it might be a use after all, for your problem.
If you look at Eq. (8) in the paper (see also eq

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kindle

New Member

Posted in Viscoelastic

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