cannot find .nc file in official cases

[wanglimeng]

Subject: Error: cannot find ocean_frc.nc in flt_test case (ROMS 3.9)

Hi all,

I'm running the official flt_test2d case, which is supposed to be a full analytical case using ANA_FORCING. But I keep getting the error:

NETCDF_OPEN - unable to open existing NetCDF file: ocean_frc.nc

I tried to comment out FRCNAME and set NFFILES=0, but ROMS 3.9 says NFFILES must be >=1.

My .in file has:
NFFILES == 0
! FRCNAME == ocean_frc.nc

And I compiled with -DANA_GRID -DANA_MASK -DANA_INITIAL -DANA_FORCING.

Could anyone tell me why ROMS is still looking for ocean_frc.nc? How to fix this?

Thanks a lot!

[wanglimeng]

This is the wrong message
-------------------------------------------------------------------------------
Model Input Parameters: ROMS/TOMS version 3.9
Tuesday - March 17, 2026 - 3:55:51 PM
--------------------------------------------------------------------------------

READ_PHYPAR - Invalid input parameter, NFFILES 0
Must be equal or greater than one.
Found Error: 04 Line: 153 Source: ROMS/Utility/inp_par.F
Found Error: 04 Line: 111 Source: ROMS/Drivers/nl_ocean.h

Elapsed CPU time (seconds):


>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Dynamic and Automatic memory (MB) usage for Grid 01: 14x12x1 tiling: 1x1

tile Dynamic Automatic USAGE MPI-Buffers

0 0.96 0.01 0.97 0.00

TOTAL 0.96 0.01 0.97 0.00

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

ROMS/TOMS - Output NetCDF summary for Grid 01:
Found Error: 04 Line: 333 Source: ROMS/Utility/close_io.F

ROMS/TOMS - I/O error ............... exit_flag: 4


ERROR: I/O related problem.

[arango]

Well, ANA_FORCING doesn't exist in ROMS. Instead, there are several analytical CPP options for forcing ROMS based on the state-vector configuration. We always recommend users to look at the UPWELLING test case. Also, look at the ROMS test repository https://github.com/myroms/roms_test. There are plenty of examples for you to choose from and learn!