On Thu, 11 Mar 2010, Liang wrote: > Can I set neumann/natural BC to my square model? I have gone through all > examples, which all set the Dirichlet BC. except the ex15(Biharmonic > Equation). There is a flux boundary condition in ex15 because of the > 4th-order PDE, so May I just take the 'Gradient flux' idea then apply it > to my 2nd-order PDE? Thanks!
The flux is a Dirichlet BC in fourth-order problems but Neumann in second-order. You're better off imposing such weakly, by evaluating (or ignoring, in the homogeneous case) the term you get when integrating by parts. --- Roy ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
