Blowing up of south china sea in COAWST

[limaolin]

the south china sea model in COAWST was blowing up, here is the output file, thanks for help.

[kate]

The first thing I would do is change NINFO from 30 to 1 so that you have a better chance of watching things go bad. The second thing I would do is change Vtransform and Vstretching to 2 and 4, respectively.

You have a negative DZmin, perhaps because of the above problem with your vertical coordinate system since your hmin is under water. Your horizontal grid has a significant range of dx,dy values - making sure the grid varies smoothly is important too. Will you show us the grid?

[limaolin]

thanks for reply.

I have modified the NINFO, Vtransform and Vstretching as your advise.

I also modified the depthmin to 15, depthmax to 5000 of the grid file.

Here are the result file and my grid picture.

what's the problem? Thanks a lot.

[kate]

Code: Select all

     11 56228 00:44:00  8.445392E-02  2.057582E+04  2.057591E+04  5.396080E+16
          (187,123,11)  1.391172E+00  1.990482E-02  1.802320E+00  5.233135E+01
 DIAG speed trouble    52.331346771928267     
 DIAG speed ijk    71.540996526572471              187         123          11

You have exceeded the horizontal CFL criterion and you now know exactly where it happened. Look at the restart file (I use ncview for a quick peek) or simply try a shorter timestep.

By the way, it happened at (i,j,k) = (187,123,11).

[limaolin]

thanks kate, i modified the DT == 120.0d0, it run correctly, thanks for your help