CCTM running error: max iterations exceeded in vppm

Hi all,

I am running CMAQ 5.2 with four nested simulation. It crashed when I run the inner domain with a resolution of 1.33km.
*** ERROR ABORT in subroutine VPPM on PE 010
max iterations exceeded in vppm at 66

I tried to modify the CTM_MAXSYNC in the script to use a shorter time step, but it didn’t work.

Does anybody know how I could fix this issue?

Thanks,

Leonard

How small did you set CTM_MAXSYNC to be?