Hi, another question. This time on SourceTerm use. I'm checking an article with diffusion and reaction. So some species diffuse, others only react (waiting for diffused species to start). If there is an example with this floating on the internet, do point it my way!
You then have a coupled set of equations, of which one of the non diffusive species will have equation like eqn3 = TransientTerm(var=P0) == ImplicitSourceTerm(-k3*M1, var=P0) + ImplicitSourceTerm(-k5*M2, var=P0) eqn4 = TransientTerm(var=P1) == ImplicitSourceTerm(k3*P0, var=M1) M1 will have another equation that has a diffusionterm. In eqn3 it is normal to use ImplicitSourceTerm as the rhs has -k3 M1 P0. In eqn4, we could actually write eqn4 = TransientTerm(var=P1) == k3*P0*M1 or eqn4 = TransientTerm(var=P1) == ImplicitSourceTerm(k3*M1, var=P0) In light that all will be coupled in one equation to solve, will this lead to different solutions? Or will fipy internally all give this the same matrix formulation? Also, in eqn3, the first term in rhs is actually -k3 M1 P0. It seems nicest if somehow it is guaranteed that values as in eqn4 for this term would be used. Will this be the case in this formulation? Perhaps there is a way to do this nicer and introduce a helper variable, U=M1*P0, so as to have only in eqn3 and eqn4 ImplicitSourceTerm(-k3, var=U) and ImplicitSourceTerm(k3, var=U) respectively. If so, how to go about to do this. If I do ImplicitSourceTerm(-k3, var=M1*P0) I get immediately the error fipy.terms.SolutionVariableNumberError: Different number of solution variables and equations. So, I would need an equation for U, would that be eqnhelper = ImplicitSourceTerm(1, var=U) == M1*P0 Or am I making things too complicated now. Thanks! Benny
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