Swirl Velocity

hamoudi · June 17, 2009, 02:50

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

f-w · July 6, 2009, 15:01

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?

juzer_700 · July 7, 2012, 01:07

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

Blanco · July 18, 2012, 07:03

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...

khaledhmz · March 22, 2019, 10:17

Quote:

Originally Posted by juzer_700

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

do you slove your problem?

khaledhmz · March 23, 2019, 16:13

Quote:

Originally Posted by Blanco

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...

but he want to simulate a 2D codinate not 3D..

khaledhmz · March 25, 2019, 13:23

Quote:

Originally Posted by f-w

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?

brother can you help me plz?

June 17, 2009, 02:50	Swirl Velocity	#1
hamoudi Member Hamoudi djamel Join Date: Apr 2009 Posts: 50 Rep Power: 16	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 khaledhmz likes this.

July 7, 2012, 01:07	Swirl velocity.	#3
juzer_700 Member Join Date: Apr 2012 Location: Mainz, Germany Posts: 60 Rep Power: 13	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

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July 6, 2009, 15:01		#2
f-w Senior Member Join Date: Apr 2009 Posts: 148 Rep Power: 16	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 18, 2012, 07:03		#4
Blanco Senior Member Blanco Join Date: Mar 2009 Location: Torino, Italy Posts: 193 Rep Power: 16	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...