Defines the boundary condition of partial differential equations. You must manually select the polymorphic instance to use.


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The following table gives the definitions of a normal derivative for one-dimensional equations and for two-dimensional equations defined on a rectangular domain.

Note If the boundary type is Neumann, you must specify the value of the normal derivative of the unknown function and not the value of derivatives along the x- or y-axes. Moreover, you cannot specify the Neumann condition on a polygonal domain.
Position Normal Derivative (One-Dimension) Normal Derivative (Rectangular Domain)
Start X
End X
Start Y N/A
End Y N/A

The following block diagram is an example of defining the boundary condition for a one-dimensional wave equation. The boundary condition at Start X is Dirichlet, which the VI defines. The boundary condition at End X is Neumann, which the numeric array defines.

Examples

Refer to the following example files included with LabVIEW.

  • labview\examples\Mathematics\Differential Equations - PDE\PDE Flexible Element.vi
  • labview\examples\Mathematics\Differential Equations - PDE\PDE String Vibration.vi
  • labview\examples\Mathematics\Differential Equations - PDE\PDE Thermal Distribution.vi