Another problem case (solved and updated)

[r.tec]

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

013 object.png (59.88 KiB) Viewed 2258 times

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:

001.png (144.41 KiB) Viewed 2258 times

The message in paraview
and

002.png (183.83 KiB) Viewed 2258 times

The message in FreeCAD

The meshed model looks like this:

003.png (347.02 KiB) Viewed 2258 times

with the mesh-parameters:

004.png (16.39 KiB) Viewed 2258 times

The physics model:

004.png (16.39 KiB) Viewed 2258 times

to be continued....

[r.tec]

Fluid property:

006 fluid property.png (14.06 KiB) Viewed 2255 times

Initialise flow field:

007 initialise flow field.png (15.76 KiB) Viewed 2255 times

Boundary condition wall:

008 boundary condition wall.png (13.49 KiB) Viewed 2255 times

Boundary condition inlet:

009 boundary condition inlet.png (23.54 KiB) Viewed 2255 times

Boundary condition outlet:

010 boundary condition outlet.png (21.8 KiB) Viewed 2255 times

[r.tec]

Mesh refinement:

011 mesh refinement.png (17.83 KiB) Viewed 2254 times

Mesh case:

012 mesh case.png (12.14 KiB) Viewed 2254 times

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)

CFD Weber 45DCOE Steel Inlet Manifold Leyland Mini.FCStd

(38.9 KiB) Downloaded 47 times

I appreciate any help.
Kind regards,
Helmut

[thschrader]

Your inlet definition in "Boundary face list" is wrong. Face 1 is the tube, should be Face 2

[r.tec]

Thank you Thomas, you made my day after days of frustration.

015 paraview 01.png (82.92 KiB) Viewed 2178 times

016 glyph1.png (207.48 KiB) Viewed 2178 times

Now I have to learn how to get these nice arrows in one plane like other simulaltions here have.

Enough to do.....

Thanks again!

[r.tec]

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

CFD 30mps 01.png (273.76 KiB) Viewed 2106 times

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.

[r.tec]

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)

ezgif.com-apng-to-gif.gif (521.15 KiB) Viewed 2015 times

But still have a lot to learn about Paraview. Let's go....

[r.tec]

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.

Side view

2021-02-03 side view.gif (833.4 KiB) Viewed 1918 times

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.

[r.tec]

..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?