# Swirl Velocity

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 June 17, 2009, 02:50 Swirl Velocity #1 Member   Hamoudi djamel Join Date: Apr 2009 Posts: 50 Rep Power: 8 Hello Everybody, I have a 2D simulation with swirl my geometry is in cylindrical coordinate The two velocities Vr and V (theta) please if any one know for corrcting me this information is it the velocity V (theta) responsible for the swirl or not ************************************************** * i have another question for cheking this formula for transformation from cylindrical coordinate to cartesienne coordinate U= Vr cos (theta)-V(theta) sin (theta) V= Vr sin (theta)+V(theta)cos (theta) Thanck you very Much

 July 6, 2009, 15:01 #2 Senior Member   Join Date: Apr 2009 Posts: 129 Rep Power: 8 I assume when you say 2D, you imply 2D axisymmetric ... Yes, V_theta is the swirl velocity. Your transformation from cylindrical to cartesian coord. systems is correct. Be careful how you use this, are you evaluating swirl velocity, or setting up boundary conditions with swirl velocity?

 July 7, 2012, 01:07 Swirl velocity. #3 Member   Join Date: Apr 2012 Location: Heidenheim Posts: 51 Rep Power: 5 Hello, I am trying to simulate axisymmetric flow in FLUENT. I am required to calcutae the Axial component, Radial and Tangential component. I know the mass flow rate and Swirl number. How to calculate the components. Can you guys help me out. I am new to this. Please

 July 18, 2012, 07:03 #4 Member   Andrea Bianco Join Date: Mar 2009 Location: Torino, Italy Posts: 50 Rep Power: 8 I will assume that you have a sort of cylinder in your geometry... create a cylindrical coordinate system (r,theta,z) on the axis of the cylinder, oriented in such a way that the z axis follow the cylinder axis... Then you have your components: radial comp. = x component on the cylindrical coord sys (r,theta,z) tangengial comp. = y comp. ... axial comp. = z comp...

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