评估在声场中对泡对进行合球体泡方法的准确性
1Department of Hydrodynamic Systems, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary.
简化的泡模型显示,对于没有喷射的孤立泡崩,其准确性很好. 然而,直接的数值模拟 (DNS) 对复杂的场景至关重要,如多泡相互作用和冲击波排放.
科学领域:
- 声学 声学 在声学上
- 流体动力学 流体动力学
- 计算物理 计算物理
背景情况:
- 合球体泡模型通过压力排放合简化的泡方程来简化多个泡系统的动态.
- 对这些模型来说,准确性评估至关重要,特别是在崩和压力排放建模过程中的峰值气泡压力方面.
研究的目的:
- 评估各种合球体泡泡模型与直接数值模拟 (DNS) 的准确性.
- 调查不同球形模型 (凯勒-米克西斯,吉尔摩) 和压力发射假设 (不可压缩,准声学,柯克伍德-贝塞) 的性能.
主要方法:
- 简化气泡模型与单个和双个气泡系统的DNS在声场中的比较.
- 在不同条件下 (如粘度,马赫数) 分析气泡动力学,峰值压力和压力波排放.
主要成果:
- 吉尔莫尔模型显示,在水中的马赫单位附近的单个气泡中,与DNS的协议更好.
- 球形模型在高粘度流体中扎,并且不能准确地跟踪来自高压缩比的冲击波,与Kirkwood-Bethe模型不同.
- DNS揭示了崩期间的喷射导致多泡系统中的球形模型过度预测内部压力.
结论:
- 球形模型在理想条件下对孤立的气泡有效,但需要DNS才能准确地分析气泡间的相互作用.
- 尽管有局限性,但球形模型对于不涉及喷射的气泡崩事件提供了良好的准确性,即使偏离了完美的球形性.
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