Message Boards

Dwaq error

carlos` g zapata, modified 1 Year ago.

Dwaq error

Youngling Posts: 1 Join Date: 12/23/18 Recent Posts

I am working with Dissolved Oxygen model in a big estuary. After running Delwaq2 afther the first step I got ERROR in GMRES           1
 Stopped with error code :           1. I' ve changed the time step from 30 seg to 20 , 10 ,1. The problem still go on. I have attached the in, lst and lst file.


Could you help me to fix this problem.

Arjen Markus, modified 1 Year ago.

RE: Dwaq error

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts

This is not the best time of year to expect answers fast, given the holiday season. One thing you can try is to set the constants Tolerance or MaxIter to different values:

CONSTANTS Tolerance DATA 1.0e-6


You can set them independently of each other. The first is the tolerance for stopping the iteration process - a larger value means the iteration will finish sooner with a possibly larger residual error, but there ought to be no significant effect on the concentrations. The second is the number of iterations that can be taken before the iteration process is terminated (and the whole calculation is terminated as well, because of lack of convergence).