pressure fluctuations

trentar · August 3, 2011, 02:09

Hallo

does there exist any procedure or equation which enables to calculate pressure fluctuations in turbulent flow.

I need some simple formula which can fastly predict pressure fluctuations in flow. Only for estimation purpose!

thanks

cfdnewbie · August 3, 2011, 04:11

hm, I doubt there's something reliable, otherwise, why would people bother doing LES?

Maybe this bit helps:
The freestream turbulent intensity is often said to be 5-10% of the mean free stream velocity, so you would end up roughly with the same fluctuations in pressure (or, using Bernoulli's law for incom. along a streamline, sth in that range....)

August 3, 2011, 02:09	pressure fluctuations	#1
trentar New Member Join Date: Aug 2011 Posts: 4 Rep Power: 14	Hallo does there exist any procedure or equation which enables to calculate pressure fluctuations in turbulent flow. I need some simple formula which can fastly predict pressure fluctuations in flow. Only for estimation purpose! thanks

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August 3, 2011, 04:11		#2
cfdnewbie Senior Member cfdnewbie Join Date: Mar 2010 Posts: 557 Rep Power: 20	hm, I doubt there's something reliable, otherwise, why would people bother doing LES? Maybe this bit helps: The freestream turbulent intensity is often said to be 5-10% of the mean free stream velocity, so you would end up roughly with the same fluctuations in pressure (or, using Bernoulli's law for incom. along a streamline, sth in that range....)