Velocity Magnitude near the Wall is off ?!

lolo97 · April 28, 2020, 09:03

Hello everybody,
i hope someone can help me, as I am running out of ideas.
I am simulating a case with chtMultiRegionSimpleFoam in OF. I also have experimental Data from an old paper. Basically, it is a simplified car-interior.
Most important for me is the flow over the windcreen.

My problem is, that though i get a nice velocity distribution near the windscreen, my velocity magnitude is off by 30%. the inlet velocity matches the experimental data.

The problem is not dependend on the mesh, also switching from k-w-SST to k-e turbulence modell didn´t really change a thing. my y+ values are <5 as I use wallLayers.

Does anyone have an idea, what the problem might be?

Thanks in advance,
Leo

Jeeloong · April 28, 2020, 19:17

Have you check the scale of your model? whether it is 1:1 with the paper scale.

lolo97 · April 29, 2020, 00:57

Thank you for your input, Jeeloong!
I actually did check that, as i had some geometry issues before. "Unfortunately" it matches the size of the "paper model" exactly.

April 28, 2020, 09:03	Velocity Magnitude near the Wall is off ?!	#1
lolo97 New Member Lennard Porter Join Date: Mar 2020 Posts: 5 Rep Power: 6	Hello everybody, i hope someone can help me, as I am running out of ideas. I am simulating a case with chtMultiRegionSimpleFoam in OF. I also have experimental Data from an old paper. Basically, it is a simplified car-interior. Most important for me is the flow over the windcreen. My problem is, that though i get a nice velocity distribution near the windscreen, my velocity magnitude is off by 30%. the inlet velocity matches the experimental data. The problem is not dependend on the mesh, also switching from k-w-SST to k-e turbulence modell didn´t really change a thing. my y+ values are <5 as I use wallLayers. Does anyone have an idea, what the problem might be? Thanks in advance, Leo

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April 28, 2020, 19:17		#2
Jeeloong Member Join Date: Jan 2015 Location: United Kingdom Posts: 53 Rep Power: 11	Have you check the scale of your model? whether it is 1:1 with the paper scale.

April 29, 2020, 00:57		#3
lolo97 New Member Lennard Porter Join Date: Mar 2020 Posts: 5 Rep Power: 6	Thank you for your input, Jeeloong! I actually did check that, as i had some geometry issues before. "Unfortunately" it matches the size of the "paper model" exactly.