Liliputian_123
Member
Dear WRF-experts,
I have some questions related to the CFL error in WRF:
[1] It is recommended that the timestep be equal to 6*dx, where dx is the horizontal resolution in km. I wonder where the "6" comes from.
Do you have documentation explaining why this value is recommended?
[2] I encountered a CFL error. Many online posts suggested reducing the time step. Indeed, when I reduced the timestep, WRF worked perfectly fine.
However, I wonder as to what extent one should reduce the time step?
Right now I am guessing the values of the time step. But I want to know if there is a more objective method on getting the correct timestep in a WRF run.
Sincerely,
Lyndz
I have some questions related to the CFL error in WRF:
[1] It is recommended that the timestep be equal to 6*dx, where dx is the horizontal resolution in km. I wonder where the "6" comes from.
Do you have documentation explaining why this value is recommended?
[2] I encountered a CFL error. Many online posts suggested reducing the time step. Indeed, when I reduced the timestep, WRF worked perfectly fine.
However, I wonder as to what extent one should reduce the time step?
Right now I am guessing the values of the time step. But I want to know if there is a more objective method on getting the correct timestep in a WRF run.
Sincerely,
Lyndz