How to check for separation

NielsHaw · July 22, 2016, 05:38

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, 08:52

Anybody pls?

nvarma · July 29, 2016, 10:03

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, 05:38	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, 08:52	ggg	#2
NielsHaw New Member Niels Hawinkel Join Date: Mar 2016 Posts: 6 Rep Power: 10	Anybody pls?

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July 29, 2016, 10:03		#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