# ICEM and CYLINDRICAL CORDINATE SYSTEM

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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 ICEM-CFD, then I export them to Star-cd, all thing is well in the same coordinate system cartesian to cartesian coordinate system. But when i build my geometry and do my Mesh (ICEM-CFD) 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 Star-CD 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 Star-CD 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 ICEM-CFD, then I export them to Star-cd, all thing is well in the same coordinate system cartesian to cartesian coordinate system. But when i build my geometry and do my Mesh (ICEM-CFD) 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 Star-CD 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 Star-CD 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: 12,832 Rep Power: 100 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 ICEM-CFD, then I export them to Star-cd, all thing is well in the same coordinate system cartesian to cartesian coordinate system. But when i build my geometry and do my Mesh (ICEM-CFD) 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 Star-CD 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 Star-CD 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 ICEM-CFD, then I export them to Star-cd, all thing is well in the same coordinate system cartesian to cartesian coordinate system. But when i build my geometry and do my Mesh (ICEM-CFD) 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 Star-CD 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 Star-CD 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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