[Jack001]

Hello,

I have a steady RANS simulation of a case I want to run transient LES on. I tried running the transient simulation from scratch, but the solver crashes in the beginning. I have read that it is instead recommended to use the RANS simulation as an initial starting point for the LES. I am not sure how I go about doing this in CFX however! Does anyone have experience with this?

Secondly I am wondering if it is acceptable to run my LES on a very very coarse grid and larger than desired time steps (so that I can actually get results on my desktop computer) before I attempt to run a proper simulation on a remote cluster. I am very new to this area so I just want someone with experience to chime in - is this an acceptable way to do it? Otherwise one would have to run the full LES simulation and it would take days/weeks/ even months before one gets a solution to verify the physics, and obviously that is not sustainable as there are bound to be mistakes! So i guess im wondering what is a good way to monitor the integrity of the LES simulation so that one doesnt have to wait ages before finding a mistake!

Thanks!