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July 23, 2009, 05:09 
ICEM and CYLINDRICAL CORDINATE SYSTEM

#1 
Member
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 9 
Hi Everybody,
I have a problem,I have 2D simulation i build my geometry and my Mesh in ICEMCFD, then I export them to Starcd, all thing is well in the same coordinate system cartesian to cartesian coordinate system. But when i build my geometry and do my Mesh (ICEMCFD) in cylindrical coordinate system in (r,theta,z) then i have my geometry in (y,z) plane, so for the velocities the radial velocity U(r) is in  y direction and U (theta) tangential velocity is in x direction and U(z) is in  z direction  after that i export my Mesh to StarCD in boundary condition at the inlet part i change the coordinate system from cartesian to cylindrical from number 1 to number 2 from ( x,y,z) to (r,theta,z) then StarCD consider that the radial velocity U(r) is  in x direction U (theta) is in y direction U(z) is in z direction  so you can observe that there is a confusion in the axis from the initial case I try to do changement of the velocities to the axis I put U(r) in y direction and U (theta) in x direction then my simulation did not convergt i have got a bad convergence  I am in waiting for your suggestion Thank you very much for you 

July 23, 2009, 06:37 
CFX and Cylindrical Coordinate

#2 
Member
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 9 
Hi Everybody,
I have a problem,I have 2D simulation i build my geometry and my Mesh in ICEMCFD, then I export them to Starcd, all thing is well in the same coordinate system cartesian to cartesian coordinate system. But when i build my geometry and do my Mesh (ICEMCFD) in cylindrical coordinate system in (r,theta,z) then i have my geometry in (y,z) plane, so for the velocities the radial velocity U(r) is in  y direction and U (theta) tangential velocity is in x direction and U(z) is in  z direction  after that i export my Mesh to StarCD in boundary condition at the inlet part i change the coordinate system from cartesian to cylindrical from number 1 to number 2 from ( x,y,z) to (r,theta,z) then StarCD consider that the radial velocity U(r) is  in x direction U (theta) is in y direction U(z) is in z direction  so you can observe that there is a confusion in the axis from the initial case I try to do changement of the velocities to the axis I put U(r) in y direction and U (theta) in x direction then my simulation did not convergt i have got a bad convergence  I am in waiting for your suggestion Thank you very much for you 

July 23, 2009, 07:48 

#3 
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,067
Rep Power: 94 
So won't a simple rotation fix it up?
Glenn 

July 23, 2009, 11:41 
CFX and CYLINDRICAL CORDINATE SYSTEM

#4 
Member
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 9 
Hi Everybody,
I have a problem, I have 2D simulation i build my geometry and my Mesh in ICEMCFD, then I export them to Starcd, all thing is well in the same coordinate system cartesian to cartesian coordinate system. But when i build my geometry and do my Mesh (ICEMCFD) in cylindrical coordinate system in (r,theta,z) then i have my geometry in (y,z) plane, so for the velocities the radial velocity U(r) is in  y direction and U (theta) tangential velocity is in x direction and U(z) is in  z direction  after that i export my Mesh to StarCD in boundary condition at the inlet part i change the coordinate system from cartesian to cylindrical from number 1 to number 2 from ( x,y,z) to (r,theta,z) then StarCD consider that the radial velocity U(r) is  in x direction U (theta) is in y direction U(z) is in z direction  so you can observe that there is a confusion in the axis from the initial case I try to do changement of the velocities to the axis I put U(r) in y direction and U (theta) in x direction then my simulation did not convergt i have got a bad convergence  I am in waiting for your suggestion ** I try to do all rotation of the plane but there is no changement in results *** Thank you very much for you 

July 23, 2009, 11:43 
CFX and Cylindrical Coordinate

#5 
Member
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 9 
Hi Everybody,
I have a problem, I have 2D simulation i build my geometry and my Mesh in ICEMCFD, then I export them to Starcd, all thing is well in the same coordinate system cartesian to cartesian coordinate system. But when i build my geometry and do my Mesh (ICEMCFD) in cylindrical coordinate system in (r,theta,z) then i have my geometry in (y,z) plane, so for the velocities the radial velocity U(r) is in  y direction and U (theta) tangential velocity is in x direction and U(z) is in  z direction  after that i export my Mesh to StarCD in boundary condition at the inlet part i change the coordinate system from cartesian to cylindrical from number 1 to number 2 from ( x,y,z) to (r,theta,z) then StarCD consider that the radial velocity U(r) is  in x direction U (theta) is in y direction U(z) is in z direction  so you can observe that there is a confusion in the axis from the initial case I try to do changement of the velocities to the axis I put U(r) in y direction and U (theta) in x direction then my simulation did not convergt i have got a bad convergence  I am in waiting for your suggestion ** I try to do all rotation of the plane but there is no changement in results *** Thank you very much for you 

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