在GCD内校准更新的SPH方案+
Calibrating an updated SPH scheme within GCD+
摘要：
我们适应现代计划的平滑粒子流体动力学（SPH）我们的树N体/SPH银河系化学动力学代码GCD+。所应用的方案包括实现Morris & Monaghan（1997）、Rosswog & Price（2007）和Price（2008）提出的人工粘性开关和人工热导率，以更精确地模拟不连续性和Kelvin-Helmholtz不稳定性。我们首先提出流体力学测试模拟和对比的结果进行运行没有人工粘度开关或热传导。此外，我们还通过采用更大或更小的平滑长度，即更大或更小数量的相邻粒子Nnb，探索不同的平滑水平。我们证明了新版本的GCD+能够模拟Kelvin-Helmholtz不稳定性，达到与网格代码Athena相似的水平。通过Gresho涡、类点爆炸和自相似坍缩实验，我们得出结论：设置光滑长度以保持相邻粒子数Nnb~58比采用较小的光滑长度更好。我们提出了我们的优化参数集的流体力学测试。
英文摘要：
We adapt a modern scheme of smoothed particle hydrodynamics (SPH) to our tree N-body/SPH galactic chemodynamics code GCD+. The applied scheme includes imple- mentations of the artificial viscosity switch and artificial thermal conductivity pro- posed by Morris & Monaghan (1997), Rosswog & Price (2007) and Price (2008), to model discontinuities and Kelvin-Helmholtz instabilities more accurately. We first present hydrodynamics test simulations and contrast the results to runs undertaken without artificial viscosity switch or thermal conduction. In addition, we also explore the different levels of smoothing by adopting larger or smaller smoothing lengths, i.e. a larger or smaller number of neighbour particles, Nnb. We demonstrate that the new version of GCD+ is capable of modelling Kelvin-Helmholtz instabilities to a simi- lar level as the mesh code, Athena. From the Gresho vortex, point-like explosion and self-similar collapse tests, we conclude that setting the smoothing length to keep the number of neighbour particles as high as Nnb~58 is preferable to adopting smaller smoothing lengths. We present our optimised parameter sets from the hydrodynamics tests.
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