天体物理火焰的幂律褶皱Turbulence-火焰相互作用模型
Power-Law Wrinkling Turbulence-Flame Interaction Model for Astrophysical Flames
摘要：
我们扩展了一个模型的燃烧火焰相互作用（TFI）考虑天体物理火焰，特别注重燃烧在Ia型超新星。湍流叶栅的惯性范围在天体物理流动模拟中几乎总是分辨率不足，需要使用模型来量化火焰表面亚网格尺度扰动的影响。我们提供了实施细节，以扩展一个经过良好测试的TFI模型低普朗特数火焰中使用的可压缩流体动力学代码FLASH。一个本地的，瞬时测量的湍流速度校准FLASH和验证测试进行。特别注意考虑亚网格均方根湍流速度和湍流火焰速度之间的关系，特别是对于高强度湍流，其中湍流火焰速度预计不会与湍流速度成比例。最后，我们探讨了不同的TFI模型在全明星，三维模拟Ia型超新星的影响。
英文摘要：
We extend a model for turbulence-flame interactions (TFI) to consider astrophysical flames with a particular focus on combustion in type Ia supernovae. The inertial range of the turbulent cascade is nearly always under-resolved in simulations of astrophysical flows, requiring the use of a model in order to quantify the effects of subgrid-scale wrinkling of the flame surface. We provide implementation details to extend a well-tested TFI model to low-Prandtl number flames for use in the compressible hydrodynamics code FLASH. A local, instantaneous measure of the turbulent velocity is calibrated for FLASH and verification tests are performed. Particular care is taken to consider the relation between the subgrid rms turbulent velocity and the turbulent flame speed, especially for high-intensity turbulence where the turbulent flame speed is not expected to scale with the turbulent velocity. Finally, we explore the impact of different TFI models in full-star, three-dimensional simulations of type Ia supernovae.
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