Discussion Forum

Hi everyone,

I have a simple set up where I'm solving a PDE for a variable u(x,t) and an ode for f(t). After a certain time t*, f reaches a maximum value of 1 and I have a change in boundary conditions for my PDE. What I've been trying to do is solve my PDE and ODE together up until this time t*. I have a separate PDE for u2, defined for the system after t* with my changed boundary conditions and where I've substituted in 0 and 1 for f and ft respectively. I want to use my solution for u at t* as my initial condition for u2.

I've tried having one study solving for u and f from t=0:t* and then another for u2 for t>t*. In my initial values in my pde for u2, I write u. Then, in my Study 2 I specify that the values of variables not solved for, i.e u, are taken from my solution from Study 1 at time t*. However, when I run this I see that it is in fact taking a zero solution as my initial condition intead of u(x,t*). I think I'm missing some simple step as it seems like it should be straightforward. I'd appreciate any help anyone can give me.