|
[Sponsors] |
November 19, 2012, 16:57 |
|
#21 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,882
Rep Power: 73 |
- what about your dy+ and dz+ close to walls?
- the plot of the static pressure is for the periodic part? |
|
November 19, 2012, 17:13 |
|
#22 |
Senior Member
|
Sorry, forget about L, i don't know where did it come from... i meant AR=W/H.
The viscosity is what i called mu. The periodicity has to be set via Text User Interface (yes, between inlet and outlet): gr -> mo -> mp Once it is set, you can define your pressure gradient in the relative panel (the dp/dx i defined above) Once you set everything and start by the perturbed RANS solution, an initial development time is required, over which the solution will adapt (slowly, because of the periodicity) to the computational setup. You can see that by monitoring the volume average (over the full domain) of the velocity magnitude squared. Once this quantity starts oscillating around some mean value you are done, you can start collecting the statistics. |
|
November 19, 2012, 18:20 |
|
#23 |
Senior Member
|
||
November 19, 2012, 18:38 |
|
#24 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,882
Rep Power: 73 |
Quote:
y+ is the local position in the direction normal to wall, expressed in wall units, that is y+= u_tau*y/ni = Re_tau* y/h. Not that h is characteristic length used in Re_tau. dy+ and dz+ are the mesh sizes expressed in wall units. Close to the walls you need 3 -4 cells within y+ and z+ =1. The plot of the pressure seems to me not to fulfill the periodic condition in streamwise direction |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
udf code for anisotropy turbulence model- square duct | Eliasjal | Fluent UDF and Scheme Programming | 1 | August 29, 2012 11:26 |
Fully developed temperature profile for square cross section duct at outlet | balkri | Main CFD Forum | 0 | October 5, 2009 12:06 |
Turbulent Flow in a Square Duct using LES | Hock Ming | FLUENT | 0 | February 7, 2009 21:25 |
how to mesh cylinder inside the square duct | kathir | Siemens | 1 | August 1, 2006 09:44 |
problem about square duct. | Bin Li | Main CFD Forum | 0 | December 29, 2003 23:11 |