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global equations
Posted Sep 12, 2021, 1:21 a.m. EDT 2 Replies
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There's a comsol model with 1 module with unknown u and there's another unknown v satisfying an equation f(u,v,a,b,c,d,...)=0, where u is the unknown solved by the module itself, f is defined in 'global expressions' and a~d... are parameters defined in 'global expressions'. In the 'global equations' interface, I set 'name' as v, 'equation' as f and 'initial' as v0. When solving it, an error message says: failed to evaluate u. What's wrong?
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Hello Carl,
You seem to have the same question as in this older thread and the same solution that Magnus provided in that thread should work for you as well. The short answer is that a Global Equation cannot contain terms that are spatially-dependent.
Best,
Jeff
-------------------Jeff Hiller
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Thank you very much Jeff!