[mo___]

Hi all,
I'm trying to perform a grid independence test on turbulence modeling for my problem, which involves the mixing process in a micromixer through LES simulation using OpenFOAM.
In a laminar case, I could easily refine the background mesh by choosing smaller values for dx, dy, and dz to obtain a finer mesh and conduct the grid test analysis straightforwardly. However, since my simulation involves turbulence modeling through LES, I am unsure how to proceed. My geometry is quite complex and not symmetrical, adding to the challenge. I'm also uncertain about the necessary steps for conducting a decent grid test analysis for LES simulation in OpenFOAM.
I would highly appreciate your assistance. If anyone knows of a good resource such as a video tutorial or thesis on this topic, it would be greatly beneficial.
Thank you all so much for your help.