Anyone knows how to use wrf-les?

[junius.Wang]

Hello everyone, I want to know if you have a relatively complete WRF-LeS tutorial. Or is it better to apply to LES? I found a lot of documents, but there is no specific setting. I am a novice, so I need some hand-to-hand solutions. If it can have a namelist reference, it is even better. It needs your help very much!

 

[junius.Wang]

can any ones help me?

 

[Ming Chen]

Hi Junius,

I am sorry to tell that there is no tutorial specifically for WRF-LES.
For the default settings, you may refer to the namelist designed for ideal LES simulation.
However, real-data LES simulation is more complicated issue. You need to get information from the literature and correctly set the phys/dynamics options.
Unfortunately we also don't have sufficient experiences for LES simulations.

 

[Whatheway]

Hi Junius,

I am sorry to tell that there is no tutorial specifically for WRF-LES.
For the default settings, you may refer to the namelist designed for ideal LES simulation.
However, real-data LES simulation is more complicated issue. You need to get information from the literature and correctly set the phys/dynamics options.
Unfortunately we also don't have sufficient experiences for LES simulations.

https://www2.mmm.ucar.edu/wrf/users/tutorial/presentation_pdfs/202101/dudhia_physics_pbl_turbulence.pdf

That might help

 

[junius.Wang]

https://www2.mmm.ucar.edu/wrf/users/tutorial/presentation_pdfs/202101/dudhia_physics_pbl_turbulence.pdf

That might help

Thanks for your help!

I did some tests myself, using three nested layers of pbl and one nested layer of les. And placed a wind farm inside the les nesting layer. But I don't know if the result is very strange because of the small locale (given my limited computing resources) and the short simulation time (24h).
1. The data visualization of u v is not real and not coherent, and the wind speed of u will not change after one degree.
2. Although there is a wind farm in my les layer, I can't find any wind farm information from the result file, which is very different from the result without les nesting layer. The power generation is also 0, but it can be clearly seen from the rsl_error that there are fans inserted into the grid.

I'll give the namelist.input file, and I'd be very grateful if you could provide any advice.

Thanks again for your reply and look forward to hearing from you again.

 

[junius.Wang]