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Post-processing

Utilities: post average turbulence fields and create turbulence fields for LES

Posted September 25, 2017 at 12:45 by kindle

This seems to be useful

Quote:

Originally Posted by Hanzo

Hi everybody,

I found the following issues in OpenFOAM concerning some turbulence analysis:

- the utility createTurbulenceFields only works for RAS computations
- there is no standard utility to average fields after computation has been done (to get U-mean, U-rms, R-Mean, Reff-Mean ...)

So I worked on these utilities and after mentioning it in some posts I got replies and private messages asking me if I could publish

...

kindle

New Member

Posted in programming, Post-processing

Views 2731 Comments 0 kindle is offline

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 3074 Comments 0 kindle is offline

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

...

kindle

New Member

Posted in Post-processing

Views 2723 Comments 0 kindle is offline

Plot over line without interpolation

Posted May 10, 2017 at 12:49 by kindle
Updated May 10, 2017 at 13:19 by kindle (cannot find "Use Data Array" for plotting with coordinates value in some version of paraview)

Follow the steps as the following post :
1. Create two "Slice"
2. "Plot Data"
3. In tab Display choose "Cell Data" (when using "plot over line", should you choose this option from defaut "Point Data", the lines will disppear). Here you can choose between "Cell Data" and "Point Data". The former will give more sharp curves as the latter does have some interpolation.

Well, after this post. There is...

kindle

New Member

Posted in Post-processing

Views 761 Comments 0 kindle is offline

How to Map Fields in openFOAM using the utility

Posted April 14, 2017 at 11:32 by kindle

simple example for mapFields.

Well, try to map the channel to a smaller channel or some thing else without cyclic BC.

Quote:

Originally Posted by Alhasan

Hey All,

How to use mapping fields function in openFOAM,

-say there are two different case two boxes, one big box and one small box with inlet on one side and outlet on the other side and all the other sides are walls. the small box is within the big box and it is in the right place in space.

-how do i even go about

...

kindle

New Member

Posted in Pre-processing, Post-processing

Views 2281 Comments 0 kindle is offline

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