A ghost entity is a local, read-only copy of a real entity on another chunk. Ghosts are typically added to the boundary of a chunk to allow the real (non-ghost) elements at the boundary to access values across the processor boundary. This makes a chunk ``feel'' as if it was part of a complete unpartitioned mesh; and can be useful with cell-centered methods, and in mesh modification.
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In Figure 4, we begin with a small mesh partitioned into pieces on the left and right. In Figure 5, we have added ghost elements (dark hashing) that share an edge with adjacent real elements (light hatching). In Figure 6, we add ghost elements that share at least one node with adjacent real elements.
January 17, 2008
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