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question of sensitive run

L

lxh@mail_iap_ac_cn

New Member
I want to run the CAM2 with different radius of earth(change the radius of the earth). But I don't know which places I should change. When I run CAM2 with different radius of earth(only change the radius of the earth), the CAM2 will be aborted after a few steps because the program named cubydr.f90 will call endrun and give warning that departure point out of bounds. I don't know what I can do to make the CAM2 run continue.
Any suggestion will be preciated.
 
O

olson

Member
lau said:
I want to run the CAM2 with different radius of earth(change the radius of the earth). But I don't know which places I should change. When I run CAM2 with different radius of earth(only change the radius of the earth), the CAM2 will be aborted after a few steps because the program named cubydr.f90 will call endrun and give warning that departure point out of bounds. I don't know what I can do to make the CAM2 run continue.
Any suggestion will be preciated.
Click to expand...

The place to change "rearth" is in models/csm_share/shr_const_mod.F90

What value are you giving rearth? I would like to try to replicate your problem
with the value you are using.
 
L

lxh@mail_iap_ac_cn

New Member
olson said:
The place to change "rearth" is in models/csm_share/shr_const_mod.F90

What value are you giving rearth? I would like to try to replicate your problem
with the value you are using.
Click to expand...

I have changed the rearth from 6.37122e6 to 3.18561e6 (which is half the radius of the earth). Then the model can't run continuously. I attempted to change the length of time step( make it smaller), then the problem would be resolved. I think the reason perhaps related with the space resolution. When the rearth has been changed, then space resolution would be changed too, so the corresponding length of time step must be adjusted.
 
R

rneale

Rich Neale
CAM Project Scientist
Staff member
This is almost certainly correct as you will be violating the CFL criteria with a smaller grid spacing and the same time-step
 
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