The pressure distribution error ABL

xinsui178 · October 16, 2017, 02:39

Hi,

I found this strange pressure distribution when I was trying to test the ABL consistence in Openfoam.
Capture.JPG
I thought this is probably caused by my size ratio but I have no idea how to adjust the solver or anything to deal with my current mesh.
mesh.JPG

Could anyone give me any advice on it?

Many thanks,

Xin

eric · October 30, 2017, 04:25

This looks reasonable to me. You will get some peaks in the corners, and obviously some pressure drop through the domain. The important thing with horizontal homogeneity of the ABL is the velocity profile and the turbulent properties, how do they look? What are your boundary conditions on the various patches?

cedric_duprat · October 30, 2017, 11:35

Xin,

As already said by Eric, your pressure looks reasonable.

If you want to check the ABL consistency in Openfoam, what could be done is to plot your streamwise velocity profile along the wall normal direction. These profiles should not change along the streamwise direction. (which is a much more challenging problem)

I hope this will help you

Cedric

xinsui178 · October 31, 2017, 22:03

Hi guys,

Thanks for your replies. I manage to get a relatively consistent ABL profile based on a modified velocity and kinetic energy profile. The results seem Ok.
Picture1.png
Picture2.png

October 16, 2017, 02:39	The pressure distribution error ABL	#1
xinsui178 New Member xin Join Date: Jun 2016 Posts: 9 Rep Power: 9	Hi, I found this strange pressure distribution when I was trying to test the ABL consistence in Openfoam. Capture.JPG I thought this is probably caused by my size ratio but I have no idea how to adjust the solver or anything to deal with my current mesh. mesh.JPG Could anyone give me any advice on it? Many thanks, Xin

October 31, 2017, 22:03	Abl	#4
xinsui178 New Member xin Join Date: Jun 2016 Posts: 9 Rep Power: 9	Hi guys, Thanks for your replies. I manage to get a relatively consistent ABL profile based on a modified velocity and kinetic energy profile. The results seem Ok. Picture1.png Picture2.png

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October 30, 2017, 04:25		#2
eric Member Knut Erik T. Giljarhus Join Date: Mar 2009 Location: Norway Posts: 35 Rep Power: 22	This looks reasonable to me. You will get some peaks in the corners, and obviously some pressure drop through the domain. The important thing with horizontal homogeneity of the ABL is the velocity profile and the turbulent properties, how do they look? What are your boundary conditions on the various patches?

October 30, 2017, 11:35		#3
cedric_duprat Senior Member Cedric DUPRAT Join Date: Mar 2009 Location: Nantes, France Posts: 195 Rep Power: 17	Xin, As already said by Eric, your pressure looks reasonable. If you want to check the ABL consistency in Openfoam, what could be done is to plot your streamwise velocity profile along the wall normal direction. These profiles should not change along the streamwise direction. (which is a much more challenging problem) I hope this will help you Cedric