On Tue, Jun 28, 2016 at 12:53 PM, Abhilash Mathews <amath...@uwo.ca> wrote: > > eq1 = (TransientTerm(var=N1) == ImplicitSourceTerm(coeff=-2.*E1, var=P2) + > ImplicitSourceTerm(coeff= -2.*E2, var=P1) + ImplicitSourceTerm(coeff= > -1./(T1/TR), var=N1)) > > eq2 = (TransientTerm(var=P1) == ImplicitSourceTerm(coeff=2.*E2, var=N1) + > ImplicitSourceTerm(coeff= -1./(T2/TR), var=P1)) > > eq3 = (TransientTerm(var=P1) == ImplicitSourceTerm(coeff=2.*E1, var=N1) + > ImplicitSourceTerm(coeff= -1./(T2/TR), var=P2)) > > eq4 = (CentralDifferenceConvectionTerm(coeff = ones, var=E1) == > ImplicitSourceTerm(coeff=constant3, var=P2) + > ImplicitSourceTerm(coeff=-1./Ldiff, var=E1)) > > eq5 = (CentralDifferenceConvectionTerm(coeff = ones, var=E2) == > ImplicitSourceTerm(coeff=constant3, var=P1) + > ImplicitSourceTerm(coeff=-1./Ldiff, var=E2))
These are not great equations from FiPy's perspective as they are purely convective. However, if you want to persist with FiPy, you may want to use some sort of relaxation for the last two equations. One thing you could do is add in a TransientTerm and DiffusionTerm with small coefficients. Initially, just use coefficients of 1 to see if actually having those terms helps the numerical stability. If that helps, see if you can dial down those coefficients to get a more physical solution or use other techniques that maintain the correct physics. -- Daniel Wheeler _______________________________________________ fipy mailing list fipy@nist.gov http://www.ctcms.nist.gov/fipy [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
