论文标题
一种改进的方法，用于将流体动力学与天体物理反应网络耦合
An Improved Method for Coupling Hydrodynamics with Astrophysical Reaction Networks
论文作者
论文摘要
由于难以准确耦合流体动力学和反应，因此对天体物理流的反应可能是具有挑战性的。这在爆炸性燃烧期间或在建立核统计平衡的高温下尤其是急性。我们根据光谱递延校正（SDC）耦合显式流体动力学和僵硬的反应源的耦合，作为操作员分裂的替代方法，它比我们之前证明的更全面的SDC方法更简单。我们将新方法应用于中等大小的天体物理核反应网络的双重爆炸问题，并探索时间步度的大小和反应网络公差，以表明与传统的strang操作员相比，简化的SDC方法可与计算费用降低相结合。这一切都是在Castro流体力学代码的框架中完成的，所有算法实现均可自由使用。
Reacting astrophysical flows can be challenging to model because of the difficulty in accurately coupling hydrodynamics and reactions. This can be particularly acute during explosive burning or at high temperatures where nuclear statistical equilibrium is established. We develop a new approach based on the ideas of spectral deferred corrections (SDC) coupling of explicit hydrodynamics and stiff reaction sources as an alternative to operator splitting that is simpler than the more comprehensive SDC approach we demonstrated previously. We apply the new method to a double detonation problem with a moderately-sized astrophysical nuclear reaction network and explore the timestep size and reaction network tolerances to show that the simplified-SDC approach provides improved coupling with decreased computational expense compared to traditional Strang operator splitting. This is all done in the framework of the Castro hydrodynamics code, and all algorithm implementations are freely available.
