Example Multipole moment

[WannesB]

When following the course ‘Astrophysical simulations’, last semester, there was a method which used multipole expansion to perform an approximation of the n-body problem: Barnes-Hut simulation. This method distributed the volume with all particles into different subvolumes (of different magnitude) with each one particle. This way, only the particles from such nearby cubic cells should be accounted individually, whereas particles further (above a specified threshold) from the “selected” particle can be taken as the center of mass of these cells. A better approximation than just taking the center of mass, is including a mass distribution in a given cell, where multipole moments of the potential should be implemented.

• This topic was modified 2 months ago by WannesB.

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