COMSOL Multiphysics™

femtime
TABLE 1-39: VALID PROPERTY/VALUE PAIRS
PROPERTY VALUES DEFAULT DESCRIPTION
Out fem | sol | u | tlist | sol
Output variables
solcompdof | stop |
Kc | Lc | Dc | Ec |
Null | Nnp | ud |
uscale | nullfun |
symmetric | cell array
of these strings
Rtol numeric 0.01 Relative tolerance
Stopcond string with expression Stop before
the expression
becomes negative
Tlist numeric vector Time list
Tout tout | tsteps See below Output times
Tsteps free |
intermediate |
strict
Time-stepping mode
In addition, the properties described in the entry femsolver are supported.
The maximum allowed relative error in each time step (the local error) is specified
using Rtol. However, for small components of the solution vector U, the algorithm
tries only to reduce the absolute local error in U below the tolerance given in Atol.
The absolute tolerance Atol can be given for each degree of freedom separately. The
value for the property Atol can be:
• A scalar.
• A solution vector.
• A solution object.
• A row cell array with alternating degree of freedom names and definitions. The
definitions can be numeric scalars or string expressions. The string expressions
may only depend on constants defined in fem.const or Const. Unspecified
degree of freedom names are given the default value 0.
There is no guarantee that the error tolerances are met strictly, that is, for hard
problems they can be exceeded.
Use Complex=on if complex numbers occur in the solution process.
The property Consistent controls the consistent initialization of a differential
algebraic equation (DAE) system. The value Consistent = off means that the
168 | CHAPTER 1: COMMAND REFERENCE