Pressure drop prediction in a pipe like structure

violethill · September 22, 2016, 20:28

Hi everyone,

I am having some issues with pressure drop prediction in CFD. The error between CFD and experimental is high, and the higher the cross flow velocities, the higher the error between the two (CFD is over estimating the pressure difference from inlet and outlet).

I am not sure how to proceed from here. My geometry is fairly simple (it is a collection of 13 bundles that are all pipes with no slip wall boundary conditions).

ghorrocks · September 23, 2016, 06:05

FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F

evcelica · September 27, 2016, 15:02

I'm guessing you are using mass flow inlet or some other constant velocity source?
This causes higher pressure drop at the entrance.
You must have an inlet region or define the flow with a developed profile. plot the pressure along a line down the pipe and look at the gradient.

September 22, 2016, 20:28	Pressure drop prediction in a pipe like structure	#1
violethill New Member Violet Join Date: Jun 2016 Posts: 8 Rep Power: 9	Hi everyone, I am having some issues with pressure drop prediction in CFD. The error between CFD and experimental is high, and the higher the cross flow velocities, the higher the error between the two (CFD is over estimating the pressure difference from inlet and outlet). I am not sure how to proceed from here. My geometry is fairly simple (it is a collection of 13 bundles that are all pipes with no slip wall boundary conditions).

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September 23, 2016, 06:05		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F

September 27, 2016, 15:02		#3
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	I'm guessing you are using mass flow inlet or some other constant velocity source? This causes higher pressure drop at the entrance. You must have an inlet region or define the flow with a developed profile. plot the pressure along a line down the pipe and look at the gradient.