Numerical treatment of boundary conditions
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apply some kind of extrapolation from the inner region for those variables that are not specified by boundary conditions;
introduce additional grid points outside the region such that the finite-difference equations can be used up to and including the boundary; however, this requires some way to define values at the added grid points (e.g. by symmetry arguments);
apply adapted finite-difference equations at the boundary, which use only available grid points, and consequently have an asymmetric grid stencil.
KeywordsGrid Point Open Boundary Homogeneous Boundary Condition Closed Boundary Boundary Treatment
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