COMSOL Multiphysics™

femwave
TABLE 1-40: TRANSFORMATION DONE BY FEMWAVE
PDE COEFFICIENT COEFFICIENT FORM GENERAL FORM
g
0
g
0
g
h
∂h h
∂t
h 0
∂h h
∂t
h 0
r
∂r
∂t
r
∂r
– hv
∂t
r
When the property Tdiff is off, the following modifications to the table applies:
TABLE 1-41: TRANSFORMATION DONE BY FEMWAVE
h
00
h 0
00
h 0
r
0
r
0
r
For a PDE problem in general form, femwave produces h using femdiff, when the
Diff property is on and the field h does not exist.
If the coefficients weak, dweak and constr are present, either in addition to the
above coefficients, or on their own because the problem is in weak form, they also
become doubled in size, but their treatment is very special because they may contain
explicit references to the n dependent variables u, their time derivatives u_time and
the test functions u_test, ux_test, etc.
174 | CHAPTER 1: COMMAND REFERENCE