On Wed, 9 Sep 2009, Vasilis Vavourakis wrote: > not sure whether this topic is already discussed in this list... > has anyone utilized LibMesh in multi-region problems (i.e. fluid-solid > interaction, different material solid-solid etc)???
Different material solid-solid is relatively easy; you've got the same variables, even the same equations, just with different constitutive properties. As long as the boundary between regions is a subset of the boundaries between elements, the finite element method handles that pretty naturally. For fluid-solid interaction, there are a couple more complex issues: To solve them fully coupled, you need to define a System with different variables in different subdomains. This support is fairly new, only in the libMesh svn head, and AFAIK has only been tested on a benchmark problem or two. To handle large deformations, you'll probably want an ALE method. There's some support in the svn head for building ALE residuals automatically with FEMSystem, but it's as experimental as can be, and as yet there's no support for automatically building a correct analytic Jacobian for these cases; I'd currently recommend handling the whole formulation yourself instead. --- Roy ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
