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hi, anyone can help me on application of Boundary condition in 3D Fem

Submitted by sameer2008 on

 hi i am solving 3D heat diffusion equation could you tell me the process of boundary condition  application in the main problem. i want to use mixed boundary condition that is robin boundary condition. how the boundary condition will effect the system stiffness and the mass matrix? or plz tell me some good books' name  from where i can get some idea.

 

plz plz plz