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July 23, 2009, 06:09 |
ICEM and CYLINDRICAL CORDINATE SYSTEM
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#1 |
Member
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 17 |
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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July 23, 2009, 07:37 |
CFX and Cylindrical Coordinate
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#2 |
Member
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 17 |
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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July 23, 2009, 08:48 |
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
So won't a simple rotation fix it up?
Glenn |
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July 23, 2009, 12:41 |
CFX and CYLINDRICAL CORDINATE SYSTEM
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#4 |
Member
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 17 |
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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July 23, 2009, 12:43 |
CFX and Cylindrical Coordinate
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#5 |
Member
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 17 |
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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