Characterization of pressure drop

tchup · October 1, 2014, 12:32

Hello,

I tried to search the forum, but I did not find a clear answer to my question :

After a numerical simulation of a turbulent flow (in a quite complex geometry), which parameter do I need to post-process in order to locate the areas contributing the most to the pressure drop (not considering the contribution of the wall) ?

I usually plot the contours of total pressure on a cross section plane, but the conclusion is not obvious.
Can I find an answer checking for exemple the turbulent dissipation rate ?

Thanks in advance !

lovecraft22 · October 3, 2014, 15:45

If you want to characterize the pressure drop then why would you look at anything else rather than the total pressure? If you have a closed geometry such as a pipe you should probably average your total pressure over a cross section.

tchup · October 6, 2014, 10:01

My problem was that because the flow is very disturbed due to the geometry (it isn't a simple cylindrical pipe), the pressure or total pressure varies a lot across the flow, not necesserily indicating a pressure loss.

But I will try to average the total pressure over a cross section and plot it, maybe it will help me.

Thank you !

October 1, 2014, 12:32	Characterization of pressure drop	#1
tchup New Member Sylvère RASERA Join Date: Apr 2011 Posts: 2 Rep Power: 0	Hello, I tried to search the forum, but I did not find a clear answer to my question : After a numerical simulation of a turbulent flow (in a quite complex geometry), which parameter do I need to post-process in order to locate the areas contributing the most to the pressure drop (not considering the contribution of the wall) ? I usually plot the contours of total pressure on a cross section plane, but the conclusion is not obvious. Can I find an answer checking for exemple the turbulent dissipation rate ? Thanks in advance !

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October 3, 2014, 15:45		#2
lovecraft22 Senior Member lore Join Date: Mar 2010 Location: Italy Posts: 460 Rep Power: 18	If you want to characterize the pressure drop then why would you look at anything else rather than the total pressure? If you have a closed geometry such as a pipe you should probably average your total pressure over a cross section.

October 6, 2014, 10:01		#3
tchup New Member Sylvère RASERA Join Date: Apr 2011 Posts: 2 Rep Power: 0	My problem was that because the flow is very disturbed due to the geometry (it isn't a simple cylindrical pipe), the pressure or total pressure varies a lot across the flow, not necesserily indicating a pressure loss. But I will try to average the total pressure over a cross section and plot it, maybe it will help me. Thank you !