Scheduled Downtime
On Friday 21 April 2023 @ 5pm MT, this website will be down for maintenance and expected to return online the morning of 24 April 2023 at the latest

Run BEP-BEM with LES

htan2013

Member
Dear experts,

I have a question about the compatibility between WRF-BEM-BEM and WRF-LES.
I'm trying to simulate an urban run in about 20m resolution (neighborhood scale), which invokes the LES (without PBL). However, the WRF-BEPBEM requires the PBL option.
I have designed 4 domains with a 1:5 ratio from 2.5km, 500m, 100m, and 20m. The PBL options are off in 100m and 20m and the BEP-BEM is on in 20m.
I have tested for several hours only on a 20m domain and the WRF can generate some WRF outputs successfully (don't know why).

Since the LES treats the turbulence in 3D instead of separate vertical and horizontal diffusion schemes. I am wondering whether using BEPBEM without PBL makes any sense.
I am attaching my namelist.input in here although I used ndown to process the simulations.

Best regards,
Haochen
 

Attachments

  • namelist.input.txt
    4.1 KB · Views: 10
Haochen,
BEP-BEM can be used without PBL scheme. The input variables for urban models include wind speed, air temperature, relative humidity, ambient pressure, precipitation, downward shortwave and longwave radiation. Other input parameters of urban geometry, building materials and anthropogenic heat etc. are provided by URBPARM.TBL.
Please look at your results at 20m resolution and check whether they are reasonable.
 
Haochen,
BEP-BEM can be used without PBL scheme. The input variables for urban models include wind speed, air temperature, relative humidity, ambient pressure, precipitation, downward shortwave and longwave radiation. Other input parameters of urban geometry, building materials and anthropogenic heat etc. are provided by URBPARM.TBL.
Please look at your results at 20m resolution and check whether they are reasonable.

Thank you for your reply!
My 20m run crashed after 20mins. I will try to add more vertical levels to test.
 
Last edited:
It is hard to run WRF at such a high resolution, I am not surprised that the model crashed ........
 
Top