Matching analytical and simulated pressure drop

harsh_kgp · October 18, 2017, 00:41

Hi,
Inlet velocity of water -0.066m/s.Laminar Flow(Re=1000) Length of pipe is 1m. The diameter of pipe-15mm. Analytically using Haigen Poisulle eq, I am getting pressure drop in pipe 9.4 Pa. But numerically using steady-state solver in Fluent, I am getting 12.1 Pa in Fluent.

Please help me to resolve this.

MKuhn · October 18, 2017, 06:48

You have very low flow velocities. Practical it doesn't matter if it is 9 or 12 Pa.

Refine your mesh, and check if this affect your result
Run the simulation with higher mass flows and compare the results with your analytical calculation again
Compare the thermodynamic properties of water in fluent and of your analytical calculation.

October 18, 2017, 00:41	Matching analytical and simulated pressure drop	#1
harsh_kgp New Member West Bengal Join Date: Oct 2017 Posts: 1 Rep Power: 0	Hi, Inlet velocity of water -0.066m/s.Laminar Flow(Re=1000) Length of pipe is 1m. The diameter of pipe-15mm. Analytically using Haigen Poisulle eq, I am getting pressure drop in pipe 9.4 Pa. But numerically using steady-state solver in Fluent, I am getting 12.1 Pa in Fluent. Please help me to resolve this.

October 18, 2017, 06:48		#2
MKuhn Senior Member Moritz Kuhn Join Date: Apr 2010 Location: Germany, Dresden Posts: 218 Rep Power: 17	You have very low flow velocities. Practical it doesn't matter if it is 9 or 12 Pa. Refine your mesh, and check if this affect your result Run the simulation with higher mass flows and compare the results with your analytical calculation again Compare the thermodynamic properties of water in fluent and of your analytical calculation.

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