# Cylindrical cordinate system

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 July 23, 2009, 02:28 Cylindrical cordinate system #1 Member   Hamoudi djamel Join Date: Apr 2009 Posts: 50 Rep Power: 10 Sponsored Links 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

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