On Mon, Apr 19, 2010 at 11:43:05AM +0200, Patrick Riesen wrote: > Anders Logg wrote: > >On Mon, Apr 19, 2010 at 10:39:26AM +0200, Patrick Riesen wrote: > >>hello, > >> > >>I possibly want to implement a free surface problem with my dolfin > >>code using the dolfin ALE functionality. dolfin can do the automatic > >>updating of the mesh nodes or else shift the nodes by a > >>user-supplied displacement function. > >> > >>in the automatic updating, the vertex-displacements are > >>'method-supplied' and not accessible, but i need to have them in > >>some displacement function in order to compute correct convective > >>velocities at all theeuler/ale/lagrange dofs. > >> > >>i can get the displacements at the mesh vertices from comparing old > >>(not yet moved) and new (moved) mesh, but what's a good way to > >>generate a displacement function in a desired functionspace out of > >>those vertex-values? > > > >What is you input? > > > >Is it displacement on the boundary? Then you can just send in the > >displaced boundary as argument to mesh.move(). > > > i define how the free boundary part will be handled/displaced, and > then i use dolfin ALE to automatically adjust the interior nodes. > > but then don't i need the displacements applied by dolfin at the > interior nodes to keep track of the relative displacement between > mesh and fluid everywhere in the domain (and my equations)?
What if you just make a copy of the mesh (or just its coordinates) before you call DOLFIN to move the interior nodes? Then you can compute the difference after. -- Anders
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