Swirl Angle Calculation

krrishcfd · March 8, 2010, 07:57

Can any one help me in finding the swirl angle in Ansys CFX Post ... before the fluid enters the impeller inlet ...

AliTr · March 9, 2010, 19:04

use the following CEL expression to create a variable which represents the Swirl Angles in any plane.

LIBRARY:
CEL:
EXPRESSIONS:
SwAnglePlane = acos((Velocity u *Normal X + Velocity v * Normal Y + Velocity w *Normal Z)/Velocity)
END
END
END

USER SCALAR VARIABLE:SwAngle
Boundary Values = Conservative
Calculate Global Range = Off
Expression = SwAnglePlane
Recipe = Expression
Variable to Copy = Pressure
END

mwmalkawi · November 4, 2021, 04:34

May i ask what is the reference form where the below formula was taken and are you confident it works and provide the pre-swirl angle because i am facing the same problem and appreciate your help

SwAnglePlane = acos((Velocity u *Normal X + Velocity v * Normal Y + Velocity w *Normal Z)/Velocity)

March 8, 2010, 07:57	Swirl Angle Calculation	#1
krrishcfd New Member KrishnaMohan.Siddu Join Date: Mar 2009 Location: Pune Posts: 8 Rep Power: 17	Can any one help me in finding the swirl angle in Ansys CFX Post ... before the fluid enters the impeller inlet ...

March 9, 2010, 19:04		#2
AliTr Member Ali Torbaty Join Date: Jul 2009 Location: Sydney, Australia Posts: 72 Rep Power: 17	use the following CEL expression to create a variable which represents the Swirl Angles in any plane. LIBRARY: CEL: EXPRESSIONS: SwAnglePlane = acos((Velocity u Normal X + Velocity v Normal Y + Velocity w *Normal Z)/Velocity) END END END USER SCALAR VARIABLE:SwAngle Boundary Values = Conservative Calculate Global Range = Off Expression = SwAnglePlane Recipe = Expression Variable to Copy = Pressure END camestha likes this.

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November 4, 2021, 04:34		#3
mwmalkawi Member Munaf Join Date: May 2019 Posts: 42 Rep Power: 7	May i ask what is the reference form where the below formula was taken and are you confident it works and provide the pre-swirl angle because i am facing the same problem and appreciate your help SwAnglePlane = acos((Velocity u Normal X + Velocity v Normal Y + Velocity w *Normal Z)/Velocity)