[COMSOL_Users] Weak form problem..

[kwonoh2000]

Dear COMSOL_users

I have got a problems by which below error log is shown.

Error:
Failed to find consistent initial values.
Singular_matrix

There are 88 void equations (empty rows in matrix) for the
variable rhos
at coordinates: (1.79774e-005,0), (3.59548e-005,0), (5.29774e-
005,0), (0,0), (0,1.66667e-005), ...
and similarly for the degrees of freedom (empty columns in matrix)

Last time step is not converged.

rhos is a dependent varialbe of weak form.

how can i solve this problem?

thanks.

[amralabed]

Dear kwonoh,

I had the exact same problem last week. It turned out to be a syntax
error in the weak form equations.

I've noticed that there is a slight difference in weak form notation
between versions 3.4 and 3.5.

you can post your equations so I can have a look at them.

cheers
Amr

Post by kwonoh2000
Dear COMSOL_users
I have got a problems by which below error log is shown.
Failed to find consistent initial values.
Singular_matrix
There are 88 void equations (empty rows in matrix) for the
variable rhos
at coordinates: (1.79774e-005,0), (3.59548e-005,0), (5.29774e-
005,0), (0,0), (0,1.66667e-005), ...
and similarly for the degrees of freedom (empty columns in matrix)
Last time step is not converged.
rhos is a dependent varialbe of weak form.
how can i solve this problem?
thanks.