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?



How small did you set CTM_MAXSYNC to be?

Hello, I also encountered the above problems, but I have sent CTM_ MAXSYBC has been reduced from 720 to 150, and the same problem is reported.The version I use is CMAQ5.0.2


CMAQv5.0.2 was released in April 2014, more than seven years ago. Please try the latest version of CMAQ. If you get the same error, please create a new thread that describes the issue as clearly and completely as you can (see the posting guidelines).