|April 25, 2005, 08:39||
LES of jet in cross flow
I am currently doing a simulation of a jet in cross flow with the RNG based SGS model. The oncoming boundary layer should be laminar, so my inlet BC some diameters upstream of the injection hole is a laminar velocity profile with free stream velocity of 5.5 m/s and turbulence intensity 0.25%. When I used the SL model, the flow developed turbulent so I changed to RNG as it is said to model transitional effects. But in the whole domain the SGS turbulent viscosity is zero since the maximum of the ramp function x (equation 10.7.13 in Fluent 6.0 manual) is around -98. So, in my opinion, I am doing a completely laminar simulation, which would mean DNS.
I compared the resolution of my grid with other works in literature and it is similar. The jet Reynolds number based on maximum jet velocity and hole diameter (8mm) is 1050, blowing ratio is around 0.4. My maximum cell extent around the hole is 0.75mm, y+ below 0.7, and time step size is 0.1ms.
Now I am wondering if it is correct what I am doing. I am thankful for every comment. Maybe someone has experience with the new SGS models in Fluent 6.2 and can recommend one of them.
Thanks in advance, Dirk
|Thread||Thread Starter||Forum||Replies||Last Post|
|how to simulate jet flow?||Benny||FLUENT||18||May 12, 2014 10:53|
|Low Mach number Compressible jet flow using LES||ankgupta8um||OpenFOAM Running, Solving & CFD||7||January 15, 2011 14:38|
|Gas flow in vortex tube - LES and grid resolution||bernarde||Main CFD Forum||1||March 26, 2009 11:50|
|Jet flow problem.. PLZ help URGENT!!||Vinayak||CFX||1||April 3, 2008 18:02|
|LES on two phase flow||Li Yang||Main CFD Forum||0||May 12, 2004 08:10|