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Search: Posts Made By: Mars409
Forum: OpenFOAM Running, Solving & CFD August 3, 2022, 05:12
Replies: 32
Views: 12,325
Posted By Mars409
How to trace back from 'negative initial temperature T0'

I ran buoyantSimpleFoam with Boussinesq as the EoS but it crashed at Time=3 for ‘negative initial temperature T0=-24’ error. fvOptions limitT solves it, but the resulting flow pattern is unphysical....
Forum: OpenFOAM Running, Solving & CFD May 28, 2022, 11:01
Replies: 17
Views: 30,649
Posted By Mars409
The fixedFluxPressure boundary condition and the...

The fixedFluxPressure boundary condition and the constrainPressure() function are now explained in a detailed openFOAM Wiki article on the SimpleFOAM solver:
...
Forum: OpenFOAM Running, Solving & CFD May 27, 2022, 10:01
Replies: 17
Views: 30,649
Posted By Mars409
All that updateCoeffs() does, as defined in...

All that updateCoeffs() does, as defined in fvPatchField.C, is setting flag update_ to true:

template<class Type>
void Foam::fvPatchField<Type>::updateCoeffs()
{
updated_ = true;
}
Forum: OpenFOAM Pre-Processing July 20, 2020, 05:38
Replies: 37
Views: 9,940
Posted By Mars409
Precisely, "it turns out that I had deleted one...

Precisely, "it turns out that I had deleted one patch in constant/polyMesh/boundary that came from the blockMeshDict, as advised in Callum Douglas' Youtube video on snappyHexMesh" is what caused my...
Forum: OpenFOAM Pre-Processing July 20, 2020, 04:04
Replies: 37
Views: 9,940
Posted By Mars409
I didn't mean to say that snappyHexMesh is...

I didn't mean to say that snappyHexMesh is supposed to be aware of the STL geometry protruding outside the bounding box. The message was merely to set out one case where the decomposePar error...
Forum: OpenFOAM Pre-Processing July 20, 2020, 03:32
Replies: 37
Views: 9,940
Posted By Mars409
I just fixed a problem that showed up with...

I just fixed a problem that showed up with similar error message during decomposePar.

After running 'checkMesh -allTopology -allGeometry', it turns out that I had deleted one patch in...
Forum: OpenFOAM Running, Solving & CFD June 25, 2020, 13:34
Replies: 3
Views: 392
Posted By Mars409
Thanks for the tip off. I ran it and got no...

Thanks for the tip off.

I ran it and got no profiling results.

It turns out need to set compiling option to 'Prof':
export WM_COMPILE_OPTION=Prof

Re-compiled OpenFOAM yesterday evening.
...
Forum: OpenFOAM Running, Solving & CFD June 22, 2020, 04:41
Replies: 30
Views: 7,647
Posted By Mars409
It works perfectly with all volume fields, except...

It works perfectly with all volume fields, except k.bulk and nut.bulk.

Without this remaining obstacle, I can use even smaller writeout time steps.

The fields aren't named in any of the header...
Forum: OpenFOAM Running, Solving & CFD June 21, 2020, 10:16
Replies: 3
Views: 392
Posted By Mars409
A cluster of 2 is almost 5x slower than individual node

I put together a cluster of two(2) raspberryPi-4 boards and ran MPPICFoam (almost, save not writing out the volume fields) across 8 processors, four from each board. The time step is around 5e-6s. No...
Forum: OpenFOAM Running, Solving & CFD June 20, 2020, 09:55
Replies: 30
Views: 7,647
Posted By Mars409
Setting MIN=origID and MAX=origID does it.

Setting MIN=origID and MAX=origID does it.
Forum: OpenFOAM Programming & Development June 20, 2020, 04:07
Replies: 8
Views: 1,803
Posted By Mars409
I ran into a weird debug switch error when I run...

I ran into a weird debug switch error when I run MPPICFoam. It didn't happen until yesterday.
$ MPPICFoam
debug::switchSet(const char*, dictionary*&):
Cannot find DebugSwitches in dictionary...
Forum: OpenFOAM Running, Solving & CFD June 19, 2020, 12:23
Replies: 30
Views: 7,647
Posted By Mars409
Update: The postprocessing output comes in the...

Update:
The postprocessing output comes in the form of a text file for each of the patches named in the patchPostProcessing dictionary in each of the time directories, like below (1 escape parcel at...
Forum: OpenFOAM Running, Solving & CFD June 18, 2020, 04:01
Replies: 30
Views: 7,647
Posted By Mars409
Thanks very much. This is great!!! Am developing...

Thanks very much. This is great!!! Am developing a better feel for this suite of tools each time I get a tip-off from you.

Based on your tip-off, I searched by "patchPostProcessing," which turned...
Forum: OpenFOAM Running, Solving & CFD June 17, 2020, 10:22
Replies: 30
Views: 7,647
Posted By Mars409
Thanks. That tip gives me the temerity to tinker....

Thanks. That tip gives me the temerity to tinker.

As an aside, how does one extract origIds, seed positions and ages of particles that escape, from a MPPICFoam solver simulation? I will take that...
Forum: OpenFOAM Running, Solving & CFD June 17, 2020, 06:47
Replies: 30
Views: 7,647
Posted By Mars409
I edited the last two paragraphs of my earlier...

I edited the last two paragraphs of my earlier reply to make them clearer.

Your suggestion to add symlink by the solver is neat. I'm not familiar with OpenFOAM's code structure so won't...
Forum: OpenFOAM Running, Solving & CFD June 17, 2020, 01:39
Replies: 1
Views: 748
Posted By Mars409
There's a short description about...

There's a short description about particleCollector here : https://openfoam.org/release/2-2-0/physical-modelling-particles-porosity-turbulence/, and it points to the splashPanel tutorial (under...
Forum: OpenFOAM Running, Solving & CFD June 16, 2020, 23:54
Replies: 30
Views: 7,647
Posted By Mars409
Tobias, Ali, Thanks. It works! This solver...

Tobias, Ali, Thanks. It works!

This solver is such a great tool. I absolutely love it.

================

On the replacing 'runTime.timeName()' with "0", I guess you are right, though I...
Forum: OpenFOAM Running, Solving & CFD June 16, 2020, 09:09
Replies: 30
Views: 7,647
Posted By Mars409
Does anyone know a way to make...

Does anyone know a way to make icoUncoupledKinematicParcelFoam not recreate files for volume fields of the flow in every time directory? I would think to satisfy ParaView creating links to the volume...
Forum: OpenFOAM Running, Solving & CFD June 15, 2020, 12:07
Replies: 10
Views: 3,717
Posted By Mars409
Thanks. It works now using the Glyph filter. ...

Thanks. It works now using the Glyph filter.

Indeed after posting the last remark yesterday I looked through the time directories and inspected the Lagrangian VTK files (they are in ASCII) and...
Forum: OpenFOAM Running, Solving & CFD June 14, 2020, 05:25
Replies: 10
Views: 3,717
Posted By Mars409
I ran the pitzDaily case with simpleFoam and then...

I ran the pitzDaily case with simpleFoam and then overwrote the system/ directory and constant/ directory files with those from your zip file, and ran icoUncoupledKinematicParcelFoam. Finally, where...
Forum: OpenFOAM Community Contributions June 13, 2020, 11:36
Replies: 23
Views: 5,842
Posted By Mars409
Plotting particles added and escapes

Hi All,

How do you get pyFoamPlotWatcher to plot the added particle count and the escape count from solver.log?

The typical time step output for particles look like below:


Time = 0.875
...
Forum: OpenFOAM Installation May 28, 2020, 05:00
Replies: 1
Views: 544
Posted By Mars409
In directory wmake/rules/linuxARM7Gcc, for two...

In directory wmake/rules/linuxARM7Gcc, for two files, cOpt and c++Opt, option '-mfloat-abi=softfp', change 'softfp' to 'hard'.

ARM7 in RPI4 has a hardware floating point processor. The developers...
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