Radial and Tangential Velocity boundary conditions

N. A. · August 17, 2010, 13:02

Hi Folks,

I have four circular inlets in a cylindrical geometry that gives out inflow at an angle. I am trying to find if there is a way to speificy radial and tangential componets of the velocity and give it as a boundary conditions.
I understand that the normal way of giving is in cartesion approach in (Ux,Uy,Uz) and I am wondering if tehre is a way to give in cylindrical coordinates, viz., (Ur,Ut,Uz) boundary conditions.

Thanks,
N.A.

T.D. · September 16, 2010, 11:48

oh i have the same problem, and no body answered me a clear answer uptill now
i hope that we will get a quick answer

robyn · December 5, 2010, 14:22

Do either of you know how to convert from Ux,y,z to tangential and axial velocity's? I am working on a cyclone geometry and would like to convert my results.

skshukla2000 · September 2, 2011, 07:38

I would like to also know how to transform Cartesian velocity components of Fluent (i.e. Ux, Uy and Uz) into cylindrical components (i.e. axial, tangential and radial)

Bernhard · September 2, 2011, 08:21

That can be achieved by an easy space-dependent matrix multiplication. You have to look it up in your favorite linear algebra book how it is done.

August 17, 2010, 13:02	Radial and Tangential Velocity boundary conditions	#1
N. A. Member N. A. Join Date: May 2010 Posts: 64 Rep Power: 16	Hi Folks, I have four circular inlets in a cylindrical geometry that gives out inflow at an angle. I am trying to find if there is a way to speificy radial and tangential componets of the velocity and give it as a boundary conditions. I understand that the normal way of giving is in cartesion approach in (Ux,Uy,Uz) and I am wondering if tehre is a way to give in cylindrical coordinates, viz., (Ur,Ut,Uz) boundary conditions. Thanks, N.A.

December 5, 2010, 14:22	Tangential & Axial Velocity Profile	#3
robyn New Member Robyn Join Date: Jun 2010 Posts: 14 Rep Power: 16	Do either of you know how to convert from Ux,y,z to tangential and axial velocity's? I am working on a cyclone geometry and would like to convert my results.

September 2, 2011, 07:38	Tangential velocity from cartesian components	#4
skshukla2000 New Member Sujeet Kumar Shukla Join Date: Sep 2011 Posts: 1 Rep Power: 0	I would like to also know how to transform Cartesian velocity components of Fluent (i.e. Ux, Uy and Uz) into cylindrical components (i.e. axial, tangential and radial)

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September 16, 2010, 11:48		#2
T.D. Senior Member Join Date: Sep 2010 Posts: 226 Rep Power: 17	oh i have the same problem, and no body answered me a clear answer uptill now i hope that we will get a quick answer

September 2, 2011, 08:21		#5
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 22	That can be achieved by an easy space-dependent matrix multiplication. You have to look it up in your favorite linear algebra book how it is done.