# Stagnation Pressure in FLUENT

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 March 15, 2012, 13:13 Stagnation Pressure in FLUENT #1 Member   Mahindra Join Date: Jan 2012 Posts: 59 Rep Power: 6 Sponsored Links Hello all I am doing analysis of flow past circular cylinder. I am stagnation pressure value at different reynolds numbers. I am taking this from Total pressure infront of cylinder XY plot in FLUENT. Am I right doing this? Also density value and velocity both equal to 1 in my simulation. Looking at experimental values I am getting nearly 0.5 less for every value. Do I need to add 0.5*density*velocity^2 value to pressure to get stagnation value. If not where I am going wrong? Thanks Regards Mahindra
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 March 15, 2012, 15:42 #2 Member   Robert Join Date: Mar 2011 Location: Warsaw Posts: 62 Rep Power: 8 In FLUENT Total Pressure for incompressible fluids is defined as: total pressure = static pressure + 0.5*density+velocity^2 Question is what is your methodology of measuring pressure during test? Probably you get there only one component of this equation.

March 16, 2012, 00:38
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Mahindra
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Quote:
 Originally Posted by Kwiaci In FLUENT Total Pressure for incompressible fluids is defined as: total pressure = static pressure + 0.5*density+velocity^2 Question is what is your methodology of measuring pressure during test? Probably you get there only one component of this equation.
I mean my simulation values are nearly 0.5 less than experimental values. Experimental values are taken from research journals.

Am I correct taking stagnation pressure from total pressure at front of cylinder?

 March 16, 2012, 07:31 #4 Member   Robert Join Date: Mar 2011 Location: Warsaw Posts: 62 Rep Power: 8 Yes you are. Maybe try to improve mesh in front of cylinder.

March 16, 2012, 10:56
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Mahindra
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Quote:
 Originally Posted by Kwiaci Yes you are. Maybe try to improve mesh in front of cylinder.
I am already using a finer mesh and drag value for this mesh is close to experimental value. Pressure value is not changing much over refinement. Rest of all parameters are good like seperation point etc..

What can I do now?

 March 16, 2012, 11:09 #6 Member   banty Join Date: Mar 2012 Posts: 52 Rep Power: 7 Totel (stagnation) pressure remains constant throughout of domain with compressible or incompressible flow until shock is present in domain.

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