在可压缩反应流模拟中抑制声波的方法

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2024-04-11 DOI:10.1007/s10494-024-00542-6

Jonas Eigemann, Christian Beck, Andreas Kempf

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引用次数: 0

摘要

本文介绍了一种改进可压缩燃烧 LES、DNS 或 URANS 初始化的新技术，即通过数值方法将火焰转化为阻尼器，以快速消除系统中的（人为）压力波动和声能。这是通过修改热释放率的压力依赖性来实现的，有效地修改了瑞利积分，使其达到负值，从而快速从系统中消除声能。该技术可（a）降低模拟成本（通过缩短初始化时间），（b）有助于稳定模拟，（c）有助于避免不切实际的热声模式，以及（d）有可能被修改以补偿过多的声能数值耗散。本文以一个热声测试案例的 LES 为例，展示了所取得的有效稳定效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

A Method to Dampen Acoustic Waves in Compressible Reactive Flow Simulations

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A Method to Dampen Acoustic Waves in Compressible Reactive Flow Simulations

A novel technique is presented to improve the initialization of compressible combustion LES, DNS or URANS by numerically turning the flame into a damper to quickly remove (artificial) pressure fluctuations and acoustic energy from the system. This is achieved by modifying the pressure dependency of the heat release rate, effectively modifying the Rayleigh Integral to achieve negative values, so that the acoustic energy is quickly removed from the system. The technique can (a) reduce the cost of simulations (by shortening the initialization), (b) contribute to stabilize the simulation, (c) help to avoid unrealistic thermoacoustic modes and, (d) potentially, be modified to compensate for excessive numerical dissipation of acoustic energy. Examples from LES of a thermoacoustic test case are presented to demonstrate the effective stabilization achieved.

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.