Astronomisches Rechen-Institut Heidelberg

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ARI-Heidelberg Mitteilungen Serie A, No. 228

Author(s): Bien, R., Fuchs, B., Wielen, R.
Title: High Spatial Resolution Using the Conventional Particle-Mesh Technique
Source: In: The CP90 Europhysics Conference on Computational Physics, Amsterdam, The Netherlands, 10-13 September 1990; A. Tenner (ed.), World Scientific, Singapore, p. 3-13
Year: 1991
Abstract: The use of the particle-mesh technique has a long and successful history in the field of computer simulations of collisionless gravitational systems, such as galaxies. Since the method allows the treatment of large numbers of particles statistical noise has only a small effect. On the other hand, severe problems arise when high density peaks must be resolved. In order to master these difficulties we have worked out a procedure which is an extension of the standard particle-mesh code in three-dimensional Cartesian coordinates. The basic idea is simply to introduce additional grids and sub-grids in regions with steep density gradients such that the system of grids is re-arranged at each integration step. In this way we are able to simulate single and interacting galaxies. In the present paper a short review of some frequently used methods of galaxy simulations is given and our own method is outlined.
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