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How to realize this "one way" problem?
Posted May 12, 2011, 11:26 a.m. EDT Studies & Solvers Version 4.1 1 Reply
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My 'one way" problem is,
Domain: 2D or 3D
Two dependent variables: T & MT
Problem: when the temperature T reaches certain point, for instance 100oC, the material melts and the value of MT at this area changes to 1 (initial value is 0), and when the temperature drops back below 100oC, the value of MT wouldl not change back from 1 to 0 (therefore I call it a one-way problem).
I hope I have described my problem clearly. So now how to realize it in comsol? The difficulty for me is how to store the value (of MT) of previous time step in comsol?
Domain: 2D or 3D
Two dependent variables: T & MT
Problem: when the temperature T reaches certain point, for instance 100oC, the material melts and the value of MT at this area changes to 1 (initial value is 0), and when the temperature drops back below 100oC, the value of MT wouldl not change back from 1 to 0 (therefore I call it a one-way problem).
I hope I have described my problem clearly. So now how to realize it in comsol? The difficulty for me is how to store the value (of MT) of previous time step in comsol?
1 Reply Last Post May 12, 2011, 1:35 p.m. EDT
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Posted:
1 decade ago
Perhaps you could set up an additional equation that solves
du/dt=(T>100)
with initial condition u(t=0)=0
and set MT=(u>0).
It's worth a try.
du/dt=(T>100)
with initial condition u(t=0)=0
and set MT=(u>0).
It's worth a try.