Given the choice of specifying the boundary conditions either on the geometry or on the finite elements which is preferrable?
In general it is preferrable to specify the boundary conditions on the geometry. This way if you decide to chnage the mesh at a later stage then the boundary conditions need not be re-specified. However there are situations where there is no choice but to deal with the f.e.mesh. For example consider the situation where a point load is to be applied to node which is coincident with a point which has been used in the generation of the geometry. Then you need to create the mesh and then apply the load to the node in question. Alternatively create the geometry which will give a coincident point where the concentrated load is to be applied apply it the point Here is a different example : Equal bending moment has to be applied to all the nodes on a particular face. Here the total bending moment is to be equally divided amongst all the nodes. Here one needs to work out how many nodes there is ging to be. Then apply the bending moment divided by the number of the nodes to the geometry.
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