CFD Online Discussion Forums

Updating Boundary Conditions Each Iteration

Posted May 11, 2017 at 10:03 by kindle
Updated June 7, 2017 at 13:13 by kindle

One post downstairs took his "fixed Gradient" to do the update at every time step. But how do I access to the U field of time step before?

Quote:

Originally Posted by thomas99

Hello All,

I have a situation where I would like to calculate some boundary conditions from the internal field. The problem is that, for each time step, the boundary conditions should be iteratively updated as part of the solution. I have searched the forum and noticed that many people have recommended the groovyBC or swak4Foam

...

kindle

New Member

Posted in programming

Views 797 Comments 0 kindle is offline

Plot over line without interpolation

Posted May 10, 2017 at 13:49 by kindle
Updated May 10, 2017 at 14:19 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 822 Comments 0 kindle is offline

Binary gives significant performance advantage (Mesh & Solve)

Posted April 28, 2017 at 06:08 by kindle

Well, binary or ascii. Haha

Quote:

Originally Posted by wyldckat

Greetings to all!

OK, only after 6 months did I manage to find enough time to run some tests of my own on a stable machine (mine isn't as stable

).
The results are now available here: https://github.com/wyldckat/wyldckat...nce_Analysis_2

The summary results:

If no file is written, it doesn't matter if it's configured to write in "binary" or "ascii".
Example

...

kindle

New Member

Posted in Pre-processing

Views 2060 Comments 0 kindle is offline

How to Map Fields in openFOAM using the utility

Posted April 14, 2017 at 12:32 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 2354 Comments 0 kindle is offline

average over cutting plane during runtime

Posted April 12, 2017 at 11:51 by kindle

This is a average on the cutting plane

Quote:

Originally Posted by gigilentini8

Dear FOAMers,
can you confirm me that the function object below in ControlDict is the correct and fastest way to calculate average over cutting planes in a 3D simulation during runtime?
it seems to work but I'm not 100% sure about the results...

Code:

functions
{
    cuttingplane_average
    {
        type            faceSource;
        functionObjectLibs ("libfieldFunctionObjects.so");

...

kindle

New Member

Posted in programming, runtime, Post-processing

Views 1207 Comments 0 kindle is offline

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Updating Boundary Conditions Each Iteration

Plot over line without interpolation

Binary gives significant performance advantage (Mesh & Solve)

How to Map Fields in openFOAM using the utility

average over cutting plane during runtime