|
[Sponsors] |
October 25, 2007, 05:59 |
patch: nothing happened..!
|
#1 |
Guest
Posts: n/a
|
Hi,
I have a duct geometry. I want to patch pressure at the inlet and outlet of the duct. I marked the cells using adapt region and used the solve -> initialize -> patch. I ran Fluent and after it converged I plot the pressure along the duct. It turned out that nothing happened. The pressure distribution remained the same. Can you help me explain this problem. Thank you |
|
October 25, 2007, 10:34 |
Re: patch: nothing happened..!
|
#2 |
Guest
Posts: n/a
|
You are patching an initial guess or condition to the zones you have marked. If you don't change the BC you won't get a different answer just by patching. In transient you may get a different answer if your IC is changed.
|
|
October 25, 2007, 11:27 |
Re: patch: nothing happened..!
|
#3 |
Guest
Posts: n/a
|
Hi Bashu,
Thanks for answering. I ran the duct without the pressure patch (case I), after few thousands of iteration, I stopped iterating and recorded the results. Then, I patched the pressure at duct inlet and outlet (case II). Shouldn't these two give different results. If not, then how is the correct procedure for patching pressure? Thank you |
|
October 25, 2007, 13:30 |
Re: patch: nothing happened..!
|
#4 |
Guest
Posts: n/a
|
If you are trying to model your case with different pressure drops you have to set it in BC panel.
Patching is for assigning a value to a ceratin zone at the beginning of your iteration but the zone won't maintain its value. If I misunderstood your question, please explain more. |
|
October 26, 2007, 01:13 |
Re: patch: nothing happened..!
|
#5 |
Guest
Posts: n/a
|
Hi Bashu,
I want to make a transient case, by changing the pressure at the inlet and outlet of the duct in the middle of iteration. I did it like this: Ran without patch -> stop iteration (plot the pressure) -> patch pressure at duct's inlet and outlet -> converge -> plot the pressure -> compare the two plot results Is this correct? If not, can you please tell me the correct way of doing it? Thank you |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[Commercial meshers] Using starToFoam | clo | OpenFOAM Meshing & Mesh Conversion | 33 | September 26, 2012 05:04 |
[Other] StarToFoam error | Kart | OpenFOAM Meshing & Mesh Conversion | 1 | February 4, 2010 05:38 |
CheckMeshbs errors | ivanyao | OpenFOAM Running, Solving & CFD | 2 | March 11, 2009 03:34 |
[Gmsh] Import gmsh msh to Foam | adorean | OpenFOAM Meshing & Mesh Conversion | 24 | April 27, 2005 09:19 |
Multicomponent fluid | Andrea | CFX | 2 | October 11, 2004 06:12 |