Is there such an Industrial case (such as airfoil) in any paper that can show the comparison between PyFR and experimental results ?
There are some comparisons shown in this paper: Redirecting
But also in some other more recent papers there are some experiemental comparisons.
In this paper, PyFR use DNS p5 scheme , but I remember that pyfr use LES model ? How to switch model in PyFR ?
PyFR does not have an LES capability (there are no sub grid models implemented). You can run ILES though (under-resolved DNS).
So in boundary layer , PyFR use wall resolved instead of wall modeled method?
This question has been asked and answered a number of times before. See: