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[Libmesh-users] nonlinear structural dynamics

 [Libmesh-users] nonlinear structural dynamics From: Ingo Schmidt - 2007-02-14 12:38:09 ```Hi all, I'm looking for someone with experience applying libmesh to nonlinear structural dynamics, e.g. material and/or large displacements/strains who could answer me some (essential and specific) questions? a) Which "System" (DiffSystem(FEMSystem), NonLinImplicit, TransientSystem) is the best choice? b) It seems that the FEMSystem is in principle a really good framework, but are the necessary changes to consider e.g. the second time derivatives, other time stepping schemes etc. feasible without destroying the given FEMSystem structure? c) I started with the linear case of the problem using the newmarksystem which is inherited from the LinearImplicitSystem class. Is there a chance to extend/use (parts of) my existing code with one of libmesh nonlinear Systems? My specific problem is a numerical model (FEM) for the analysis of dynamic interaction effects of harbour facilities (e.g. quay walls) using the theory of porous media (Biot), that is nonlinear soil dynamics. The PDE/FEM structure is like that: | K(u) -Q | | u | | 0 0 ||u_t] | M 0||u_tt| |fu| | | | | + | || | + | || | = | | | 0 H | | p | | Qt S ||p_t| | G 0||p_tt| |fp| u: Displacement field p: (pore) pressure Hopefully, there is someone who can help me and give some recommendations/hints. Thanks in advance Sincerely Ingo Schmidt -- Dipl.-Ing. Ingo Schmidt Institute of Modelling and Computation Hamburg University of Technology Denickestr.17 Building L/ room: 3032 21075 Hamburg http://www.mub.TU-Harburg.de ```