Abstract
A new method to vectorise the SPH (smooth particle hydrodynamics) code is presented that makes the CPU time grow linearly with the number of particles. This method is presented in 2D, but can be easily extended to 3D, with only ≈20% increase in memory. One of the main advantages of this hydrodynamical code is that a variable particle size can be used. This implies a variable spatial resolution, particularly useful to sample high density regions, in density-contrasted physical problems.
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