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Strange errors about several "uncorrelative problem".
Posted Oct 9, 2010, 10:30 p.m. EDT 0 Replies
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I am in trouble when solve PDE problem. There are 5 sets of couplied PDEs and 8 boundary conditions, and a term of "(u1/u2)^0.5" is in one of the eqations.
Then whether there must have 10 boundary conditions for 5 sets of PDEs (2:1)?
The strange error is show below.
1. When I remove 2 boundary conditions, i.e, the number of conditions now is 6, Comsol would cue that: "Failed to evaluate expression" when solving, that mean that the expression of "(u1/u2)^0.5" is wrong.
2. When I sovle the 5 sets of couplied PDEs with 8 boundary conditions, the result can be received even if it is not so good. Then how the wrong of "(u1/u2)^0.5" disappear ?
So weather the term of "(u1/u2)^0.5" is wrong? How to handle the number of boundary conditions? How to treat the PDE problem?
Could anybody guard me a alternative way?
Thank you very much!
youf.
Hello youf Blue
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