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Enforcing max/min values in PDE mode
Posted 13.04.2012, 10:04 GMT-4 Parameters, Variables, & Functions Version 4.2a 0 Replies
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I'm currently solving a system of equations, all entered in PDE mode. Only one is time dependent and is of the form:
Ft + v . grad(F) = (1-F)div(v)
I used the coefficient PDE mode for this equation and a reasonable solution is returned, but I would like to be able to set max and min values for F but can't seem to figure out how. I tried setting adding a term to all the coefficients:
Ft + (F<Fmax) v . grad(F) = (F<Fmax)*(1-F)div(v)
I had hoped that this would just make Ft = 0 where F exceeds the maximum value, so that F would no longer change in those locations but it doesn't have any effect at all.
Does anyone know:
1. Why my attempt doesn't work?
2. How I can go about enforcing max/min values?
3. How I could stop calculations if a max/min value is exceeded?
Hello c_h_r_i_s
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