Difference between revisions of "Ghost nodes (theory)"
From Medusa: Coordinate Free Mehless Method implementation
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| − | + | Ghost nodes are a technique for discretizing (mostly) Neumann boundary conditions in PDEs. | |
| + | |||
| + | == Introduction == | ||
| + | Ghost are a technique used for disretizing Neumann boundary conditions in FDM. To be able to use the central difference for first derivative, additional point, called ghost point, is introduced outside the domain boudanry. | ||
| + | The unknown function value at the ghost node is added as a variable. At the boundary node, the Neumann condition is enforced, as well as the equation itself (two equations for two unknowns, the ghost and the boundary function value). | ||
| + | |||
| + | == Meshless setting (implicit) == | ||
| + | TODO Jure | ||
| + | |||
| + | === Explicit version === | ||
| + | TODO Jure | ||
Revision as of 13:46, 15 May 2019
Ghost nodes are a technique for discretizing (mostly) Neumann boundary conditions in PDEs.
Introduction
Ghost are a technique used for disretizing Neumann boundary conditions in FDM. To be able to use the central difference for first derivative, additional point, called ghost point, is introduced outside the domain boudanry. The unknown function value at the ghost node is added as a variable. At the boundary node, the Neumann condition is enforced, as well as the equation itself (two equations for two unknowns, the ghost and the boundary function value).
Meshless setting (implicit)
TODO Jure
Explicit version
TODO Jure
