(Oops, that CellVariable should be a FaceVariable.)
Charles On Mon, Apr 7, 2014 at 11:08 AM, Charles Reid <charlesre...@gmail.com>wrote: > Hi there, > > I'm attempting to implement an operator-split scheme that requires me to > apply an Adams Bashforth scheme to a convection term (distinct from other > terms, like diffusion or reaction). The Fipy example covering the similar > Crank-Nicholson scheme showed the approach for an entire equation, however, > not a single term. > > What I'd like to be able to do is assign a term to a CellVariable, so that > I could perform the AB2 averaging with the current value of the variable > and the old value of the variable, something like this: > > -----------------8<---------------------- > > MyConvectionTerm = CellVariable(mesh=m, hasOld=True, value=0.) > > MyConvectionTerm = ConvectionTerm(mycoeff) # initial convection term value > > while t < ttotal: > > [...] > > ContinuityConvection.updateOld() > MyConvectionTerm = (3./2.)*ConvectionTerm(mycoeff) - > (1./2.)*MyConvectionTerm.old() > > [...] > > ------------------8<------------------------- > > However, I can't figure out how to make terms and variables compatible. > Any ideas on how I can do this? How can I store old values of terms? > > Thanks! > > > > Charles >
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