## 2.2. Parallelization of SPH Calculations

One of the main benefits of the SPH solver is its ability to evaluate the governing variables of a nonlinear dynamic analysis without utilizing a mesh or grid structure, thus allowing for very high levels of deformation. This benefit means that the domain cannot be decomposed by choosing grid lines and intersections as occurs with grid calculations.

In order to decompose the SPH calculation we utilize the virtual work units which are set up to facilitate the searching algorithm which is integral to the SPH solver. Each work unit is a cube and together they encompass the entire computational domain with a grid structure. The number of SPH nodes within a work unit is evaluated and a similar algorithm to that used to decompose the grid calculations is used to decompose the work units and therefore SPH nodes in order to minimize inter-processor communication. At present this is a static decomposition; each SPH node stays on the same processor for the length of the calculation.

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