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How to determine natural boundary condition and essential b.c. in Ritz method

  1. Apr 29, 2012 #1
    I am trying to understand Ritz method, but i have troubles wtih determining the boundary conditions. After weak formulation of a differential equation how do we determine natural and essential b.c.?

    What are boundary terms, secondary variables, primary variables, natural and essential boundary conditions exactly?
    Can somebody explain these terms please?

    For example
    Code_Cogs_Eqn.jpg


    in above differential equation, what are boundary terms, secondary variables, primary variables, natural and essential boundary conditions?
     
  2. jcsd
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