CFD vs Test Pressure

dulalerbap · November 27, 2012, 17:10

Hi All:
I ran CFD simulation (FLUENT) of a component (many concepts to find the lowest pressure drop one) and then measured static pressure at several points to match. But what we found out that measured static pressure matches well with the CFD Total pressure (not static). Did anybody face this type of situation? Does anybody have any explanation/guess why this is happening?
-static pressure is measured by pressure transducer.

Thanks.

Engr.RZA · November 28, 2012, 11:18

Fluent gives the exact value of the static pressure even if you are using RANS instead of LES.

Give some details about the geometry and problem description then i can suggest whats happening in the flow.

dulalerbap · November 28, 2012, 13:25

Thanks RZA.
Basically two (2) pipes after the compressor going to a aftercooler. So pressure drop I was talking about is between the section : after the compressor (2 pipes) to the aftercooler (after two pipes merged) in to a rectangular section. So static pressure drop is negative (from theoretical point and FLUENT). But the test gives postive pressure drop which is similar to the total pressure drop from FLUENT.

November 27, 2012, 17:10	CFD vs Test Pressure	#1
dulalerbap New Member Join Date: Nov 2012 Posts: 5 Rep Power: 13	Hi All: I ran CFD simulation (FLUENT) of a component (many concepts to find the lowest pressure drop one) and then measured static pressure at several points to match. But what we found out that measured static pressure matches well with the CFD Total pressure (not static). Did anybody face this type of situation? Does anybody have any explanation/guess why this is happening? -static pressure is measured by pressure transducer. Thanks.

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November 28, 2012, 11:18		#2
Engr.RZA New Member RZA Join Date: Nov 2012 Posts: 25 Rep Power: 13	Fluent gives the exact value of the static pressure even if you are using RANS instead of LES. Give some details about the geometry and problem description then i can suggest whats happening in the flow.

November 28, 2012, 13:25		#3
dulalerbap New Member Join Date: Nov 2012 Posts: 5 Rep Power: 13	Thanks RZA. Basically two (2) pipes after the compressor going to a aftercooler. So pressure drop I was talking about is between the section : after the compressor (2 pipes) to the aftercooler (after two pipes merged) in to a rectangular section. So static pressure drop is negative (from theoretical point and FLUENT). But the test gives postive pressure drop which is similar to the total pressure drop from FLUENT.