Solver error in V1.6

[Daniel Parras]

Hello all,

After updating to ATS v1.6, we converted an XML file that previously ran successfully in v1.4 using the python script from the git. Since the update, the simulation struggles to converge in the surface–subsurface coupled solve, causing the timestep to decrease significantly and the model to make very little progress.

The model represents a watershed-scale domain with a 3D subsurface mesh and a surface mesh generated from it. The subsurface is defined using seven vertical geologic layers, and the system simulates fully coupled variably saturated flow and pressure-based overland flow within a water-balance framework, with a PK structure similar to the priestley_taylor example.

I have attached the output log and a screenshot of the failed message for reference. Any guidance on common causes of this issue in v1.6 would be greatly appreciated.

Thank you for your time.

Best regards,
Daniel Parras

[Bo Gao]

Hi Daniel,

Can you provide your input files for v1.4 and v1.6? When you ran it successfully with v1.4, did you also start from canopy-snow-surface-subsurface coupling without spinup for initialization? Thanks.

Best,

Bo Gao

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