Can’t parallel the solver

[Maxim Gryaznov]

Hi, CfdOF / CFD members!

I want to run simulations on several cores. So, i write in Solver:
Parallel = true
Parallel cores = 4.

Then i press “Write OpenFOAM case”. When it completes, i press “Run Solver”. After about 30 seconds, it exits with an error:
ERROR: Failed to post close command error 1726
ERROR: unable to tear down the job tree. exiting...

— there are the same two lines in log.simpleFoam only.

Status window:
0.0: Checking dependencies...
0.0: OpenFOAM case writer is called
3.8: Write OpenFOAM case is completed
0.2: Starting solver command:
0.2: C:\BLUECF~1\OPENFO~1.X\..\msys64\usr\bin\bash --login -O expand_aliases -c cd "/c/tselli/FreeCAD CFDOF/Cube/case" && ./Allrun
0.3: Solver started
36.3: Simulation exited with error

Report window:
ERROR: Failed to post close command error 1726
ERROR: unable to tear down the job tree. exiting...

Last lines in Python window:
>>> FreeCAD.getDocument("Cube").getObject("OpenFOAM").Parallel = True
>>> FreeCAD.getDocument("Cube").getObject("OpenFOAM").ParallelCores = 4

report & python.png (201.64 KiB) Viewed 594 times

If i don’t run parallel, it works ok. So, what should i do to run the parallel solver?

P. S. Before FreeCAD/BlueCFD/CfdOF i made parallel simulations in STAR CCM+: 4 cores worked great.

___
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13541 (Git)
Build type: Release
Branch: releases/FreeCAD-0-17
Hash: 9948ee4f1570df9216862a79705afb367b2c6ffb
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: Russian/RussianFederation (ru_RU)

[thschrader]

Hi Maxim,
welcome to the FreeCAD-forum.
Can you post your FreeCAD-file?
It is easier to have a concrete problem than to guess a solution.
Thomas

[Maxim Gryaznov]

Can you post your FreeCAD-file?
It is easier to have a concrete problem than to guess a solution.
Thomas

Thanks for your quick response, Thomas!

There is a working directory with FCStd files and cases. Hope, it’s enough:
https://drive.google.com/file/d/1OYLtXi ... sp=sharing

[thschrader]

Hi Maxim,
I have no problem to run your file. But I get strange results.
When running a laminar case, it "works".
Thomas

cpu_load.JPG (80.83 KiB) Viewed 687 times

your_case_turbulent.JPG (31.59 KiB) Viewed 687 times

cube_laminar.JPG (28.12 KiB) Viewed 687 times

[Maxim Gryaznov]

Thank you Thomas!

But I get strange results.
When running a laminar case, it "works".
Thomas

It’s strange: i got the second picture with the turbulent case.

Turbulent.PNG (141.44 KiB) Viewed 679 times

Did you make any setups on your computer before running parallel calculations? Maybe i should make something to allow OpenFOAM to make parallel runs?

[oliveroxtoby]

Did you make any setups on your computer before running parallel calculations? Maybe i should make something to allow OpenFOAM to make parallel runs?

My guess would be that there is a problem with your installation of MPI. Try re-installing blueCFD-Core, and make sure to install the MSMPI library (it is installed by default).

If that doesn't work please take a look at https://forum.freecadweb.org/viewtopic.php?f=37&t=27055 and follow the instrucitons - there may be some output that would give a clue.

[Maxim Gryaznov]

My guess would be that there is a problem with your installation of MPI. Try re-installing blueCFD-Core, and make sure to install the MSMPI library (it is installed by default).

If that doesn't work please take a look at https://forum.freecadweb.org/viewtopic.php?f=37&t=27055 and follow the instrucitons - there may be some output that would give a clue.

Oliveroxtoby!

Sorry for the late reply. I reinstalled blueCFD-Core and MPI: now i have 7.1.12437.25 version. It was in an installation tutorial (http://bluecfd.github.io/Core/UserGuide/). Unfortunately, i have the same error.

[oliveroxtoby]

If that doesn't work please take a look at https://forum.freecadweb.org/viewtopic.php?f=37&t=27055 and follow the instrucitons - there may be some output that would give a clue.

Apologies - I didn't notice that you had attached a screenshot the first time.

Some googling suggests this is some sort of an issue with MS MPI. I can only suggest you try installing the latest one in place of the version that came with blue CFD - https://docs.microsoft.com/en-us/messag ... rosoft-mpi.

Good luck!

[Maxim Gryaznov]

Hey, oliveroxtoby!

Apologies - I didn't notice that you had attached a screenshot the first time.

No, that’s my bad: i uploaded the screenshot after your message — i didn’t say, that i updated my post. I’m sorry.

Some googling suggests this is some sort of an issue with MS MPI. I can only suggest you try installing the latest one in place of the version that came with blue CFD - https://docs.microsoft.com/en-us/messag ... rosoft-mpi.

I tried three versions:
1. 8.1.many-numbers-after when i created this topic
2. 7.1.12437.25 after your suggestion about reinstallation blue-core
3. 10.0.12498.5 after your last message.

Unfortunately, they didn’t solve my issue.

[thschrader]

Unfortunately, they didn’t solve my issue.

There is a video from Bruno Santos how to install bluecfd.
Goto 2:30. The MS-MPI installer given with bluecfd should overwrite an existing MPI.
But sometimes this does not work (on my machine). So be sure to uninstall all
existing MPI (reboot system) before installing bluecfd.
About computing forces in paraview please see pics.
https://www.youtube.com/watch?v=nl7er2t-TnU

cell_normals.JPG (68.84 KiB) Viewed 533 times

calculator.JPG (76.14 KiB) Viewed 533 times

force.JPG (157.69 KiB) Viewed 533 times