CFD Online Discussion Forums

Lognormal Distribution for Particle Size in OpenFOAM

Posted May 1, 2018 at 12:13 by Mehar

Tags dpmfoam, lognormal, mppic, openfoam

This is for future reference, if anyone wants to use lognormal particle distribution in OpenFoam.
1) Generate PDF from following formula

Here mu and sigma are the geometric mean and standard deviation of the particle size distribution
Here is an example plot of the lognormal distribution with mean 1 and standard deviations of 1.8, and 3. You can first re-create lognormal distribution with these parameters...

Attached Files

	logNormal Pdf.xlsx (36.0 KB, 519 views)
	kinematicCloudProperties.txt (5.2 KB, 437 views)

Mehar

New Member

Posted in OpenFoam

Views 2982 Comments 1 Mehar is offline

Wall function usage

Posted April 2, 2018 at 23:34 by zacwhee

about wallfunction usage

Quote:

Originally Posted by G_German

Since the documentation on the use of wall functions (or BCs for turbulence models in general) in OpenFOAM is rather small I tried to write up a little summary of what is posted in the internet (for kEpsilon, kOmegaSST & SA).
As this may also be interesting to other people and I would be interested in feedback, please find the summary below:

Basics:
If the grid near the wall is fine enough (~y+<1 everywhere and at least 4-5 nodes

...

zacwhee

New Member

Posted in Uncategorized

Views 2759 Comments 0 zacwhee is offline

Exporting two different meshes simultaneously from salome to openfoam

Posted March 16, 2018 at 15:13 by p@nkaj

Hello,
This is my first post.

I want to export two different meshes at a time from salome 8.3.0 to (OpenFOAM-in-Box-18.02-r638).
I don't want to compound those meshes.
I used med and cgns formats to export, but failed.
When I exported using med, I was unable to convert it into foam file. I tried using ideasUnvToFoam <File_name>.med.
The polymesh folder was created, but all the files i.e. boundary, points, faces, neighbour and owner were empty....

p@nkaj

New Member

Posted in Uncategorized

Views 2529 Comments 0 p@nkaj is offline

cfMesh my steps

Posted March 3, 2018 at 00:48 by student666
Updated September 22, 2018 at 13:53 by student666

fms file creation

Code:

surfaceToFMS file.stl

extraction of edges from stl file

Code:

surfaceFeatureEdges file.stl file.fms -angle 30

This is to visualize with paraview

Code:

FMSToSurface -exportFeatureEdges file.fms fileEdge.fms

#several steps for improving mesh quality

Code:

cartesianMesh.exe
checkMesh.exe >> log.Mesh1
improveMeshQuality.exe
checkMesh.exe >> log.Mesh1
improveMeshQuality.exe
checkMesh.exe >> log.Mesh1
improveSymmetryPlanes.exe

...

student666

Senior Member

Posted in Pre-processing

Views 3128 Comments 1 student666 is offline

MPI barrier inside OpenFoam

Posted March 1, 2018 at 06:34 by kindle

Pstream has two sub directories :
dummy and mpi

Quote:

Originally Posted by matteoL

Hello,
when running in parallel, for some reasons I have some actions that have to be done only by the master core and I would like the other partitions to wait until the master has finished.
(I call those action doing:
If (Pstream::master()){ ...} )

I think the solution in a general c++ code using MPI would be to add a line like:
MPI_BARRIER(MPI_COMM_WORLD)

...

kindle

New Member

Posted in programming

Views 1921 Comments 0 kindle is offline