I was just ready to send you a code when I realised what the problem was. When I define Q as a scalar expression, updating it after every time step does not update the expression in the weak form (I define a and L outside the time loop and then just call the solver at every time step). Defining the expression by Q_expr = Expression("A*sin(2*pi*F*t)", t=t, A=A, F=F) Q.interpolate(Q_expr) and updating it by Q_expr.t = t works though. Therefore I had to re-define the linear and bilinear parts of the weak form inside the time loop for the first approach to work. On 30/09/15 15:58, Lawrence Mitchell wrote:
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On 30/09/15 15:51, Anna Kalogirou wrote:
Yes, I double - and triple - checked and I believe I am doing the same thing in both approaches. I don't understand then why the results are different. Hmph, can you show us some breaking code?
Lawrence
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-- Dr Anna Kalogirou Research Fellow School of Mathematics University of Leeds http://www1.maths.leeds.ac.uk/~matak/