The uniform grid implementation of an Eulerian mesh assumes that the distance between any two grid points along a
dimension is the same everywhere in the domain. In a sequential implementation, the uniform grid can be viewed as a single
block, while in a parallel implementation, the domain is divided into equal sized blocks where one or more blocks map to one
processor. The FLASH implementation maps one block to one processor, therefore, association with a block implies association
with the corresponding processor. Fig. 3 shows the displacement of a particle after an evolution timestep, where a particle
changes its association to the neighboring block along a corner. In general, a particle leaving its current block may
migrate to any of the 3d 1 neighbors where d is the number of dimensions in the computational domain. Moreover, while
a source block can determine all the destination blocks for its migrating particles locally, the destination blocks themselves
have no local information about incoming particles.
The uniform grid implementation of an Eulerian mesh assumes that the distance between any two grid points along adimension is the same everywhere in the domain. In a sequential implementation, the uniform grid can be viewed as a singleblock, while in a parallel implementation, the domain is divided into equal sized blocks where one or more blocks map to oneprocessor. The FLASH implementation maps one block to one processor, therefore, association with a block implies associationwith the corresponding processor. Fig. 3 shows the displacement of a particle after an evolution timestep, where a particlechanges its association to the neighboring block along a corner. In general, a particle leaving its current block maymigrate to any of the 3d 1 neighbors where d is the number of dimensions in the computational domain. Moreover, whilea source block can determine all the destination blocks for its migrating particles locally, the destination blocks themselveshave no local information about incoming particles.
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