|
[Sponsors] |
cylindrical coordinate vs cartesian coordinate |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
November 29, 2003, 17:28 |
cylindrical coordinate vs cartesian coordinate
|
#1 |
Guest
Posts: n/a
|
I face a problem in comparing my CFD results (Fluent) with my LDA measures(Dantec) because they use cylindrical coordinate and cartesian coordinate respectively. Can I change the Fluent from a cylindrical coordinate to a cartesian coordinate?
|
|
December 1, 2003, 04:52 |
Re: cylindrical coordinate vs cartesian coordinate
|
#2 |
Guest
Posts: n/a
|
Hi, I dunno if it is what you are looking for but here is the linked between the cartesian and cylindrical coord. in fluent Z -> X r -> Y theta -> Z
You can certainly find more informations on the fluent user web site (online documentation). Cheers, thomas |
|
May 1, 2013, 19:33 |
|
#3 |
New Member
Hadi kafil
Join Date: Apr 2013
Location: Istanbul
Posts: 8
Rep Power: 13 |
Hi, I'm solving a natural convection problem in Fluent 13, but I want to model a 3D symetric cylindrical shape in 2-d. I assume (r=x, z=y, theta=0).
How can I change my coordinate from Cartesian to cylindrical??? |
|
May 10, 2013, 05:56 |
|
#4 | |
New Member
Mukesh
Join Date: Sep 2012
Posts: 28
Rep Power: 14 |
Quote:
change your problem from 2D to aisymmetric. That's it. Best Wishes, Mukesh |
||
May 10, 2013, 10:24 |
cylinderical coordinate in Fluent
|
#5 |
New Member
Hadi kafil
Join Date: Apr 2013
Location: Istanbul
Posts: 8
Rep Power: 13 |
I have done it. Draw my half shape, and define the symmetry axis as "axis" in Boundary condition, and select 'Axisymmetry' in define-solver, but there is an error : "Divergence detected in AMG solver: x-momentum"
|
|
May 10, 2013, 14:01 |
|
#6 | |
New Member
Mukesh
Join Date: Sep 2012
Posts: 28
Rep Power: 14 |
Quote:
for UNSTAEDY PROBLEM: reduce the size of time step |
||
May 10, 2013, 19:49 |
|
#7 |
New Member
Hadi kafil
Join Date: Apr 2013
Location: Istanbul
Posts: 8
Rep Power: 13 |
I have reduced relaxation factor of momentum equation from 0.7 to 0.3, 0.4, 0.5, 0.6, ... but there is still that error.
I even close the momentum equation (Solution control-equation) but this time the error was " Divergence detected in AMG solver: temperature " ! |
|
May 10, 2013, 22:22 |
|
#8 | |
New Member
Mukesh
Join Date: Sep 2012
Posts: 28
Rep Power: 14 |
Quote:
Else there is some problem with BC. BTW what is problem you are trying to solve. |
||
May 11, 2013, 10:53 |
|
#9 |
Senior Member
OJ
Join Date: Apr 2012
Location: United Kindom
Posts: 473
Rep Power: 20 |
Can you post BCs please?
OJ |
|
May 11, 2013, 13:39 |
|
#10 |
New Member
Hadi kafil
Join Date: Apr 2013
Location: Istanbul
Posts: 8
Rep Power: 13 |
I have a rectangle ( a cross section of cylinder) I wanna solve Natural convection (and then solidification) problem.
I have a temperature gradient in right and left wall (my rectangle is 40x100). and this UDF is my boundary condition in left and right wall... I solve it in cartesian coordinate, but in Cylindrical, I have problem. #include "udf.h" DEFINE_PROFILE(temperature_profile, thread, index) { real x[ND_ND]; /* this will hold the position vector */ real y; face_t f; begin_f_loop(f,thread) { F_CENTROID(x,f,thread); y = x[1]; F_PROFILE(f, thread, index) =((1000*y)/2)+1223; } end_f_loop(f,thread) } |
|
May 11, 2013, 14:05 |
|
#11 |
New Member
Hadi kafil
Join Date: Apr 2013
Location: Istanbul
Posts: 8
Rep Power: 13 |
I solved this problem in Planer (2d space) without any problem.
I reduce the Under-relaxation factor for energy and momentum. I aslo try to solve it Transient. But there is still this error. for momentum equation: " Divergence detected in AMG solver: x-momentum " for ener Last edited by grayeagle; May 14, 2013 at 11:02. |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
CFD Software with Cylindrical and Spherical Coordinate | cfd2010 | Main CFD Forum | 0 | June 9, 2010 22:55 |
cylindrical to Cartesian coordinate | bharath | CFX | 0 | June 6, 2010 22:43 |
change coordinate system cartesian to cylindrical | tht | FLUENT | 0 | September 6, 2007 06:46 |
cartesian to cylindrical coordinate UDF | Manoj | FLUENT | 0 | December 15, 2005 10:43 |
Cording Ground.for in Cylindrical coordinate | J.H. Lee. | Phoenics | 2 | March 28, 2003 05:28 |