How to check for separation

NielsHaw · July 22, 2016, 04:38

Hi,

I'm designing a low-drag vehicle and I'm trying to eliminate all separation. When i plot the skin friction coefficient, my lowest value is 0.004. My question now is: At what value can you assume you actually have separation? Does the skin friction coefficient value have to be exactly zero, or is there a threshold value?

Thanks in advance

NielsHaw · July 29, 2016, 07:52

Anybody pls?

nvarma · July 29, 2016, 09:03

usually it goes to zero and may be a little bit to the negative side (flow reversal).

You can also try plotting stream wise pressure gradient to ensure thats separation

July 22, 2016, 04:38	How to check for separation	#1
NielsHaw New Member Niels Hawinkel Join Date: Mar 2016 Posts: 6 Rep Power: 10	Hi, I'm designing a low-drag vehicle and I'm trying to eliminate all separation. When i plot the skin friction coefficient, my lowest value is 0.004. My question now is: At what value can you assume you actually have separation? Does the skin friction coefficient value have to be exactly zero, or is there a threshold value? Thanks in advance

July 29, 2016, 07:52	ggg	#2
NielsHaw New Member Niels Hawinkel Join Date: Mar 2016 Posts: 6 Rep Power: 10	Anybody pls?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Mesh check failed	subhas.hunasikatti@gmail.	FLUENT	0	January 19, 2014 04:09
[ICEM] Understanding check mesh output	kotimari	ANSYS Meshing & Geometry	0	July 15, 2012 08:33
faceZones and topological check	mturcios777	OpenFOAM Programming & Development	0	June 15, 2012 13:48
OpenFOAM15 paraFoam bug	koen	OpenFOAM Bugs	19	June 30, 2009 10:46
Cell check and Boundary check errors	AB	Siemens	4	October 28, 2004 13:04

July 29, 2016, 09:03		#3
nvarma Senior Member nm Join Date: Mar 2013 Posts: 100 Rep Power: 13	usually it goes to zero and may be a little bit to the negative side (flow reversal). You can also try plotting stream wise pressure gradient to ensure thats separation