On 16/02/11 16:54, Johan Hake wrote: > Question #145534 on DOLFIN changed: > https://answers.launchpad.net/dolfin/+question/145534 > > Johan Hake proposed the following answer: > On Wednesday February 16 2011 08:48:38 Anders Logg wrote: >> Question #145534 on DOLFIN changed: >> https://answers.launchpad.net/dolfin/+question/145534 >> >> Status: Open => Answered >> >> Anders Logg proposed the following answer: >> >> On Tue, Feb 15, 2011 at 10:30:06PM -0000, Yi Jiang wrote: >>> New question #145534 on DOLFIN: >>> https://answers.launchpad.net/dolfin/+question/145534 >>> >>> Hi all, >>> >>> I am using the dolfin to solve a PDE problem by finite element method. >>> However, I met a problem when I try to define the linear form L(v) of >>> right hand side. Suppose the PDE is: >>> >>> F(x) = f. >>> >>> What should I do if the f is a Dirac Delta function. How to define it in >>> ufl? Anybody met and solved the similar problems before? >>> Thank you for attention and kind help. >> >> This is not supported. > > I am also interested in this. What would it require to implement? Changes to > UFL, FFC, DOLFIN? >
A lot of changes. It would require being able to integrate over surfaces/lines within a cell. UFL can be stretched to do this, but extentions to FFC and DOLFIN are needed. Take a look at the modelling discontinuities chapter in the FEniCS book ;). Garth > Johan > _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : [email protected] Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
