Question #139887 on DOLFIN changed: https://answers.launchpad.net/dolfin/+question/139887
Johan Hake proposed the following answer: On Sunday January 2 2011 02:25:13 Sungick Kim wrote: > Question #139887 on DOLFIN changed: > https://answers.launchpad.net/dolfin/+question/139887 > > Status: Answered => Open > > Sungick Kim is still having a problem: > Initially, I wanted to change the actual boundary domain. > After checking your answer out, > I think that changing the value of Dirichlet boundary condition for a fixed > boundary would be correct. So I tried this code below. However, the value > is not changing. > Could you give me a hand again? > > --------------------------------------------------------------------------- > ----------------- boundary = compile_subdomains("on_boundary") > > # approximated step function whose value is 1 for x[0] < t > g = Expression("0.0 + 1.0/(1+exp(10*(x[0]-t)))") > > BC = DirichletBC(Q1, g1, boundary) > > # Parameters for time stepping > T = 10.0 > dt = 0.1 > t = 0.0 > > while t < T: > > t += dt > # solve problem > --------------------------------------------------------------------------- > ----------------- You need to update t in your expression: ... while t < T: t += dt g.t = t #!!! # solve problem Johan You received this question notification because you are a member of DOLFIN Team, which is an answer contact for DOLFIN. _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : dolfin@lists.launchpad.net Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
