Using CFD to calculate minor loss coefficient

mariejanethompson · November 18, 2016, 11:56

If I model a 90 degree bend (turbulent where v=1m/s and d=0.01m) and I get a pressure reading from a monitor before the bend (e.g. 1500Pa), and a pressure reading from another monitor after the bend (e.g. 500Pa) how do I work out the minor loss coefficient from this?

Is CFD calculating the major loss? (1500-500=1000Pa)?

FMDenaro · November 18, 2016, 12:02

Provided you set the correct physical and mathematical model, the correct boundary conditions, provided that your scheme is consistent and stable, your problem has a Re number of O(10^3) that allows a CFD code to run in DNS condition. That means you get all the variables you want.

November 18, 2016, 11:56	Using CFD to calculate minor loss coefficient	#1
mariejanethompson New Member Join Date: Nov 2016 Posts: 3 Rep Power: 10	If I model a 90 degree bend (turbulent where v=1m/s and d=0.01m) and I get a pressure reading from a monitor before the bend (e.g. 1500Pa), and a pressure reading from another monitor after the bend (e.g. 500Pa) how do I work out the minor loss coefficient from this? Is CFD calculating the major loss? (1500-500=1000Pa)?

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November 18, 2016, 12:02		#2
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,882 Rep Power: 73	Provided you set the correct physical and mathematical model, the correct boundary conditions, provided that your scheme is consistent and stable, your problem has a Re number of O(10^3) that allows a CFD code to run in DNS condition. That means you get all the variables you want.