NDSolve`FEM`
NDSolve`FEM`

InitializePDECoefficients::femcmsd

Details

  • This message is generated when the PDE has higher-than-second-order spatial derivatives.
  • Off[message] switches off the message; On[message] switches it on. For example: Off[InitializePDECoefficients::femcmsd].

Examples

Basic Examples  (1)

In the case of a biharmonic equation, higher-than-second-order derivatives are present:

The solution is to rewrite the equation as a system of two equations:

Note that the derivative boundary conditions from the original problem are now Dirichlet conditions for the system of equations.

Plot the solution: