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InitializePDECoefficients::femcmsd
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    • Details and Options Details and Options
    范例  
    基本范例  
    相关链接
    NDSolve`FEM`

    InitializePDECoefficients::femcmsd

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    • 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].

    范例

    基本范例  (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: