DOE OSTI · code-54357
Nyx
Abstract
Nyx is a highly parallel, adaptive mesh, finite-volume N-body compressible hydrodynamics solver for cosmological simulations. Nyx code solves equations of compressible hydrodynamics on an adaptive grid hierarchy coupled with an N-body treatment of dark matter. The gas dynamics in Nyx uses a finite volume methodology on a set of 3-D Eulerian grids; dark matter is represented as discrete particles moving under the influence of gravity. Particles are evolved via a particle-mesh method, using Cloud-in-Cell deposition/interpolation scheme. Both baryonic and dark matter contribute to the gravitational field. In addition, Nyx includes physics needed to accurately model the intergalactic medium: in optically thin limit and assuming ionization equilibrium, the code calculates heating and cooling processes of the primordial-composition gas in an ionizing ultraviolet background radiation field. Additional physics capabilities are under development.
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Sexton, Jean [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Research Division] (0000000325511678), Almgren, Ann [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Research Division] (000000032103312X), Lukic, Zarija, Friesen, Brian [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)] (0000000215721631), Myers, Andrew [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Research Division] (0000000184278330), Zhang, Weiqun [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Research Division] (0000000180921974), Daley, Chris. 2017-05-05. Nyx. https://doi.org/10.11578/dc.20210414.4
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