How to output diffusion coefficients in WRF-les?

[xifeng cao]

Hello, I have been trying to simulate a plume with the WRF-LES model. The horizontal resolution is 70 m. I'm looking to output diffusion coefficients for each moment. But I don't know what to do. Which files do I need to modify? I would be very grateful if you could help me with this.

 

[Pechudin]

I am not an expert (only used LES in a couple of cases), but the coeffiecients are usually connected to (for example) TKE (look at the WRF design document) and grid step, so you could calculate the coefficient in terms of that.

EDIT: Meaning, if you can get TKE then you can calculate the coefficients too.

 

[Ming Chen]

@xifeng cao
Are you running a real-data LES simulation? Can you upload your namelist.input for me to take a look?

 

[xifeng cao]

I am not an expert (only used LES in a couple of cases), but the coeffiecients are usually connected to (for example) TKE (look at the WRF design document) and grid step, so you could calculate the coefficient in terms of that.

EDIT: Meaning, if you can get TKE then you can calculate the coefficients too.

Thanks for your help!

 

[xifeng cao]

@xifeng cao
Are you running a real-data LES simulation? Can you upload your namelist.input for me to take a look?

Thank you for your response.
The simulation is carried out in an ideal state. The namelist.input is in the attachment.

 

[Ming Chen]

The model does not output diffusion coefficients from LES (xkm*, xkh*), but they can be added to the output file. Code needs to be added to output the terms that use these coefficients. But because these are all instantaneous fields, you must be cautious when interpreting the results.

 

[xifeng cao]

Thanks for your help!