COMSOL Multiphysics™

TABLE 2-5: SOLVER ERROR MESSAGES
ERROR NUMBER ERROR MESSAGE EXPLANATION
7081 No parameter name given The parametric solver does not find a name
for the parameter. Check the Name of
parameter edit field on the General page of
the Solver Manager.
7092 Out of memory in Algebraic multigrid The Algebraic multigrid solver/
preconditioner ran out of memory. See
error 7144 regarding general
memory-saving tips.
7093 Out of memory during back substitution The solver ran out of memory during back
substitution. See error 7144 regarding
general memory-saving tips.
7094 Out of memory during LU factorization The solver ran out of memory during LU
factorization. See error 7144 regarding
general memory-saving tips.
7111 Singular matrix The system matrix (Jacobian matrix or
stiffness matrix) is singular, so the solver
cannot invert it. Usually this means that the
system is underdetermined. Check that all
equations are fully specified and that the
boundary conditions are appropriate. For
instance, in a stationary model you usually
need to have a Dirichlet condition on some
boundary. A singular matrix could also
occur if mesh elements are of too low
quality. If the minimum element quality is
less than 0.005 you might be in trouble.
Another reason for this error message is
that you have different element orders for
two variables that are coupled by, for
example, a weak constraint. Use the same
element order for all variables that are
coupled.
7136 Very ill-conditioned preconditioner. The
relative residual is more than 1000 times
larger than the relative tolerance
You need to improve the quality of the
preconditioner to get an accurate solution.
For the Incomplete LU preconditioner,
lower the drop tolerance.
ERROR MESSAGES | 417