An error for two-way nesting with restart

[d.kobashi]

Hi,

I am trying to run the model with two-way nesting (parent and child grids). I was able to run spinup with lower DT (otherwise the model blows up) and then tried to do another run with larger DT using the restart file from spinup. The model ended up with the error below.

Code: Select all

PUT_REFINE2D - unbounded contact points temporal:  interpolation:                                                                                                                            
  cr       = 01        dg         = 01        ng         = 02
  iic(dg)  = 0000001   told       = 1         tnew       = 2
  iic(ng)  = 0000001   Wold       = ********  Wnew       = ********
  time(ng) = *******   time(told) = *******   time(tnew) = *******

 PUT_REFINE2D - unbounded contact points temporal:  interpolation:
  cr       = 01        dg         = 01        ng         = 02
  iic(dg)  = 0000001   told       = 1         tnew       = 2
  iic(ng)  = 0000001   Wold       = ********  Wnew       = ********
  time(ng) = *******   time(told) = *******   time(tnew) = *******

 PUT_REFINE3D - unbounded contact points temporal:  interpolation:
  cr       = 01        dg         = 01        ng         = 02
  iic(dg)  = 0000001   told       = 1         tnew       = 2
  iic(ng)  = 0000001   Wold       = ********  Wnew       = ********
  time(ng) = *******   time(told) = *******   time(tnew) = *******
 Found Error: 08   Line: 6267     Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F
 Found Error: 08   Line: 570      Source: ROMS/Nonlinear/nesting.F

I saw some ROMS users in this forum had the same error, but I don't see the answer.

I used the following time steps. The ratio is 5:1.
Spinup : DT=20.0, DTFAST=40 (parent grid), DT=4.0, DTFAST=40 (child grid)
Restart: DT=100.0 DTFAST=40 (parent grid), DT=20.0, DTFAST=40 (child grid)

I also tried different time steps and none of them work. So I guess it's not related to the time step I chose.
What I don't understand is that the model worked for spinup (2-day run and the output looks fine) and did not work for the restart run. Since the model ran for spinup, I assume that my contact file is fine.
Could someone tell me why? Any comments/suggestions would be appreciated.
BTW, I use the latest version of COAWST (version 3.5).

Thanks in advance.

-DJ

[d.kobashi]

Don't know why, but the error is gone after I changed nrrec from 0 to -1. Strange. Now the model is running, but the computational speed seems to be slow.

[kate]

Two-way nesting is slow in ROMS. That's the way it is. The French croco code may be faster.