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Hi there,

I have built a COMSOL 2D model that uses deformed geometry, where the geometry movement is non uniform. I need to use Automatic Remeshing to update the mesh elements. But after some time (t = 0.29s) it fails.
I tried using moving mesh, mesh refinement as well as segregated solver, but I am unable to get rid of this error. I need to know why this error keeps popping up, and whether there is something that I am missing.
I have given the error, as well as the warning below, and also attached the wireframe and surface plots of the concentration before the error.

Any help would be appreciated.
Thanks.

Warning:
MUMPS allocation factor increased to 1.44.

Error:
The following feature has encountered a problem:
Nonlinear solver did not converge.
In Segregated Step 1
:
Time : 0.2924214449879353
Segregated Step 1
Singular_matrix

There_are x_void_equations_(empty_rows_in_matrix)_for_the_variable_x 14 comp1.cH_1p
at_coordinates (-1e-007,2e-007), (-1e-007,1.5e-007), (-1e-007,1e-007), (-1e-007,5e-008), (-1e-007,-3.08102e-020), ...
There_are x_void_equations_(empty_rows_in_matrix)_for_the_variable_x 14 comp1.cOH_1m
at_coordinates (-1e-007,2e-007), (-1e-007,1.5e-007), (-1e-007,1e-007), (-1e-007,5e-008), (-1e-007,-3.08102e-020), ...
There_are x_void_equations_(empty_rows_in_matrix)_for_the_variable_x 10 comp1.npe.Ceq_eqreac1
at_coordinates (-1e-007,2e-007), (-1e-007,1.5e-007), (-1e-007,1e-007), (-1e-007,5e-008), (-1e-007,-3.08102e-020), ...


Last time step is not converged.
- Feature: Automatic Remeshing 1 (sol1/t1/ar1)
- Feature: Time-Dependent Solver 1 (sol1/t1)