A small question in postprocessing of LES result

[jushi-123]

Dear incompact3d developers,

I have a small question to consult you. For the LES result of turbulent channel flow, I can calculate the utau by using streamwise velocity profile. Actually, the streamwise velocity u is scaled with the centerline velocity in procedure. The utau in LES sometimes has some discrepancy with the DNS result. When we need to plot the uplus-yplus or the urms-yplus, the y/H and the u should be scaled with the utau in LES or utau in DNS?

I look forward to your reply, thanks!

[mathrack]

Hello,

For a given simulation, there are various ways to estimate the friction at the wall :

• Using the derivative of the time-averaged velocity at the walls
• Using the source term in the momentum equation

We do not provide guidelines for post-processing simulations.

Best regards,
Mathrack