Hello everybody,
I must say that I am absolutely new to CFD and I want to increase my knowledge just for fun as much as possible.
With the help of Thomas Schrader I manged to get blueCFD, cfMesh and Paraview installed and running.
Now I designed a simple curved channel with
Face1 being the wall
Face2 outlet and
Face3 inlet
Then I watched Pawels video on YT and I set the same parameters like he did, except that I took air as the fluid and a velocity of 6 m/s = 6000 mm/s.
Now I go on from the back, i.e. the result of the solver:
The message in paraview
and
The message in FreeCAD
The meshed model looks like this:
with the mesh-parameters:
The physics model:
to be continued....
Another problem case (solved and updated)
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Another problem case (solved and updated)
Last edited by r.tec on Tue Jan 26, 2021 1:13 pm, edited 1 time in total.
Re: Another problem case
Fluid property:
Initialise flow field:
Boundary condition wall:
Boundary condition inlet:
Boundary condition outlet:
Re: Another problem case
Mesh refinement:
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.23683 (Git)
Build type: Release
Branch: master
Hash: af4de262e326452fd79f036253cf7cac6a7e7e00
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: German/Germany (de_DE)
I appreciate any help.
Kind regards,
Helmut
Mesh case:
What do I do wrong?OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.23683 (Git)
Build type: Release
Branch: master
Hash: af4de262e326452fd79f036253cf7cac6a7e7e00
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: German/Germany (de_DE)
I appreciate any help.
Kind regards,
Helmut
-
- Veteran
- Posts: 3157
- Joined: Sat May 20, 2017 12:06 pm
- Location: Germany
Re: Another problem case
Your inlet definition in "Boundary face list" is wrong. Face 1 is the tube, should be Face 2
Re: Another problem case
Thank you Thomas, you made my day after days of frustration.
Now I have to learn how to get these nice arrows in one plane like other simulaltions here have.
Enough to do.....
Thanks again!
Now I have to learn how to get these nice arrows in one plane like other simulaltions here have.
Enough to do.....
Thanks again!
Re: Another problem case (solved and updated)
Now, that I took out all my mistakes with the help of Thomas I tried another model. This time an inlet-channel of a cylinder head into the cylinder bore. A quite complicated geometry.
U=30 m/s
The next step will be to subtract the valve guide and the valve itself from the model and try deploy CFD to the even more complicated geometry.
U=30 m/s
The next step will be to subtract the valve guide and the valve itself from the model and try deploy CFD to the even more complicated geometry.
Re: Another problem case (solved and updated)
Played a little bit around with Paraview. I am impressed:
Uinlet = 30 m/s, Solver ran for over 7 hours, practically the hole day through (n=1500 iterations)
But still have a lot to learn about Paraview. Let's go....
Uinlet = 30 m/s, Solver ran for over 7 hours, practically the hole day through (n=1500 iterations)
But still have a lot to learn about Paraview. Let's go....
Re: Another problem case (solved and updated)
Apologies to all if I am nerving but I am so amazed of what is possible with "household means", i.e. a not too up-to-date PC, that I simply have to make an update on this fred.
The valve lift is 10 mm.
Unforutunately the top view and the stream line and glyph gif-animations are too large to upload here.
I am absolutely flashed by these CFD possibilities in FC. Thank for everyone who made this come true.
The valve lift is 10 mm.
Unforutunately the top view and the stream line and glyph gif-animations are too large to upload here.
I am absolutely flashed by these CFD possibilities in FC. Thank for everyone who made this come true.
Re: Another problem case (solved and updated)
..now that I have played around with this I wonder if following would be possible with FC-CFD:
- the output had a pressure of 25inHg (Mercury, roughly 0.85 bar) which is in fact a suction
- get the flow rate on the input in cubic feet per minute (cfm) or in litre per minute or cubic metre per minute
Does anybody know if this could be determined and how to do this?
- the output had a pressure of 25inHg (Mercury, roughly 0.85 bar) which is in fact a suction
- get the flow rate on the input in cubic feet per minute (cfm) or in litre per minute or cubic metre per minute
Does anybody know if this could be determined and how to do this?