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-   -   LES turbulence decaying in channel (http://www.cfd-online.com/Forums/fluent/48670-les-turbulence-decaying-channel.html)

cfdIsMad July 3, 2008 17:10

LES turbulence decaying in channel
 
Hi

I am running a channel flow using LES. My problem is that turbulence after developing for a bit starts to decay in channel. And after a while I see zero turbulence in my domain. What can I do under such circumstances to sustain the turbulence. Thank you for your answer.


Renato Pacheco July 4, 2008 12:55

Re: LES turbulence decaying in channel
 
give more details on what you simulating. maybe I can help

cfdIsMad July 4, 2008 13:32

Re: LES turbulence decaying in channel
 
Hi Renato

Thank you for your answer. I am using periodic boundary with pressure drop between inlet and outlet. I am using RANS solution as initial condition. Mesh is hexa unstructured with very low YPlus values, below 1. I have half a million cells in my grid. Courant number is 0.6 and the length of channel is 1.6m. Discretisation scheme is central difference. Thanks in advance for your help.


Renato Pacheco July 4, 2008 14:08

Re: LES turbulence decaying in channel
 
ok, but when you start with RANS you have some turbulence forming and when you change to LES it dissapear? is it?


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