Flow through Cone with pressure drop

[r.tec]

Hello,
I need some help as it seem that I cannot come any further myself.

Task is that I have a cone with a pressure of air of 100 kPa on the inlet (large area of the cone); 95 kPa on the small area of the cone.

In real life a pressure drop like this would let the fluid flow from the high-pressure-area to the low-pressure area.

Pressure drop 001.png (389.3 KiB) Viewed 1205 times

Meshing went okay.

First question: is it altogether possible to simulate this pressure drop situation?

I have tried many different adjustments in the parameters but all to no avail.

Writing the case is okay:
0.0: Checking dependencies...
0.0: Case writer called
0.2: Matching boundary conditions ...
0.4: Case written successfully

Running the solver gives an error code:
17:52:31 Time = 0
17:52:31
Processor 0: field transfer
17:52:31 Processor 1: field transfer
17:52:31 Processor 2: field transfer
17:52:31 Processor 3: field transfer
17:52:31
End

17:52:31 ERROR: Failed to post close command error 1726
ERROR: unable to tear down the job tree. exiting...
17:52:32

My FC Information:
OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.2.29177 +426 (Git)
Build type: Release
Branch: (HEAD detached from 0.20.2)
Hash: 930dd9a76203a3260b1e6256c70c1c3cad8c5cb8
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3
Locale: German/Germany (de_DE)
Installed mods:
* Cfd
* CfdOF 1.21.6
* CfdOF.bak 1.21.4
* Curves 1.21.6
* Curves.bak 0.6.6
* dodo 1.0.0
* fasteners 0.4.54
* freecad.gears 1.0.0
* Plot 2022.4.17
* sheetmetal 0.2.61

The file:

CFD Kegel_hs.FCStd

(146.77 KiB) Downloaded 55 times

Thank you for any advice.
Kind regards,
Helmut

[NewJoker]

First question: is it altogether possible to simulate this pressure drop situation?

Yes, of course. Pressure difference between inlet and outlet is commonly used in CFD.

I don't get any errors when I submit the analysis from the attached file. Check your CfdOF installation and try submitting some test analysis (something really basic like a pipe).

[Raedchen_im_System]

Hello @r.tec ,

on my computer, your simulation model runs without errors. After 173 iterations, the solution converged. I used the CfdOf-workbench 1.21.4 and ESI-OpenCFD v2206.

When I look on your screenshot, it looks like you have an issue with a phyton-file. The next message tells you to look into your log-file. You can find the logfiles from ESI-OpenFoam pressing the "edit"-button in the Cfd-Solver-Menue:

logfile.jpg (32.16 KiB) Viewed 1118 times

Your message refers to the directory C:\Users\Helmut\AppData\Roaming\FreeCAD\Mod\Cfd. Did you use the Cfd-Workbench or the CfdOf-Workbench?

[oliveroxtoby]

17:52:31 ERROR: Failed to post close command error 1726
ERROR: unable to tear down the job tree. exiting...
17:52:32

From the below post:

[*] On Windows, there can be issues with conflicting MSMPI versions. This is usually indicated by the following error:

Code: Select all

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

The best remedy is usually to uninstall and reinstall the OpenFOAM (or BlueCFD) package, making sure to run the installer with administrator privileges if possible. If asked, answer 'yes' to reinstalling MSMPI.

[r.tec]

...yes, reinstalled MS MPI: FreeCAD runs through. Fine!

Now I get an error-message from Paraview:

Traceback (most recent call last):
File "<string>", line 53, in <module>
File "C:/Program Files/blueCFD-Core-2020/AddOns/ParaView/bin\Lib/site-packages\paraview\servermanager.py", line 424, in __ConvertArgumentsAndCall
retVal = func(*newArgs)
TypeError: ResetCamera argument 1: expected a sequence of 6 values, got bool

Do not know how to remedy it but it seems not to hinder further work with Paraview.

Thanks a lot!

[oliveroxtoby]

...yes, reinstalled MS MPI: FreeCAD runs through. Fine!

Now I get an error-message from Paraview:

Traceback (most recent call last):
File "<string>", line 53, in <module>
File "C:/Program Files/blueCFD-Core-2020/AddOns/ParaView/bin\Lib/site-packages\paraview\servermanager.py", line 424, in __ConvertArgumentsAndCall
retVal = func(*newArgs)
TypeError: ResetCamera argument 1: expected a sequence of 6 values, got bool

Do not know how to remedy it but it seems not to hinder further work with Paraview.

Thanks a lot!

Which version of Paraview is this?

[r.tec]

Version 5.6.2 64-bit
Qt Version 5.12.3