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simple beam meshing

Posted by Ross Williamson at October 23. 2012
Sorry total noob question....
 
I'm currently exporting a simple beam (0.5x0.1x0.05m) from solidworks as a STEP file.  The aim is to compare Solidworks simulationXpress deflection results where one end is fixed and a pressure is applied to the top surface with that produced by Elmer's linear elasticity simulation.
 
I currently just import the step file and create a new mesh using the hexahedron (i,j,k) with the default 3d hexahedron hypothesis (Equidistant distribution).  The problem is that to get close to the correct answer I need to use a very large number of segments. It almost appears the the max displacement is being calculated from the center of the element not the end of the last element. 
 
When I do the meshing do I need to do some kind of specific 2d sub-mesh for the moving end of the bar or do I just need to have a high density of points there? It could also be that I'm screwing something up in Elmer with the simulation but it does seem like a mesh density problem.
 
 
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