I would like to solve the biharmonic equation D^4(phi) = 0 on a rectangular domain in the xy-plane with second-order boundary conditions. The boundary conditions would be fixed values for phi,xx; phi,yy and phi,xy. Is the NthOrderBoundaryCondition module the right way to implement this, and if so, how do I specify which variables the derivatives are with respect to? What is the correct syntax for specifying phi,xx = 0 and phi,xy = 0 on some faces?
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