Bibliographic Details
| Title: |
Perfectly parallel cosmological simulations using spatial comoving Lagrangian acceleration |
| Authors: |
Leclercq, Florent, Faure, Baptiste, Lavaux, Guilhem, Wandelt, Benjamin D., Jaffe, Andrew H., Heavens, Alan F., Percival, Will J., Noûs, Camille |
| Source: |
A&A 639, A91 (2020) |
| Publication Year: |
2020 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics |
| More Details: |
Existing cosmological simulation methods lack a high degree of parallelism due to the long-range nature of the gravitational force, which limits the size of simulations that can be run at high resolution. To solve this problem, we propose a new, perfectly parallel approach to simulate cosmic structure formation, which is based on the spatial COmoving Lagrangian Acceleration (sCOLA) framework. Building upon a hybrid analytical and numerical description of particles' trajectories, our algorithm allows for an efficient tiling of a cosmological volume, where the dynamics within each tile is computed independently. As a consequence, the degree of parallelism is equal to the number of tiles. We optimised the accuracy of sCOLA through the use of a buffer region around tiles and of appropriate Dirichlet boundary conditions around sCOLA boxes. As a result, we show that cosmological simulations at the degree of accuracy required for the analysis of the next generation of surveys can be run in drastically reduced wall-clock times and with very low memory requirements. The perfect scalability of our algorithm unlocks profoundly new possibilities for computing larger cosmological simulations at high resolution, taking advantage of a variety of hardware architectures.
Comment: 24 pages, 8 figures, 2 tables. Typos corrected with respect to A&A published version. The code is publicly available at https://bitbucket.org/florent-leclercq/simbelmyne/ |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/202037995 |
| Access URL: |
http://arxiv.org/abs/2003.04925 |
| Accession Number: |
edsarx.2003.04925 |
| Database: |
arXiv |
