CLC number:
On-line Access: 2023-07-20
Received: 2022-09-23
Revision Accepted: 2023-01-05
Crosschecked: 2023-07-20
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Citations: Bibtex RefMan EndNote GB/T7714
https://orcid.org/0000-0001-8738-2504
Bo AN, Josep M. BERGAD, Weimin SANG, Dong LI, F. MELLIBOVSKY. Square cavity flow driven by two mutually facing sliding walls[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2200447 @article{title="Square cavity flow driven by two mutually facing sliding walls", %0 Journal Article TY - JOUR
双边反向驱动内流过渡流特性研究机构:1西北工业大学,航空学院,中国西安,710072;2翼型、叶栅空气动力学国家重点实验室,中国西安,710072;3中国空气动力研究与发展中心,结冰与防除冰重点实验室,中国绵阳,621000;4加泰罗尼亚理工大学,流体力学系,西班牙巴塞罗那,08034;5加泰罗尼亚理工大学,航空航天工程部,物理系,西班牙巴塞罗那,08034 目的:探究双边驱动方腔内流流场的过渡流临界特性,捕捉各种流动分岔点,分析其对流场特性带来的改变。确定流场演化模式,解释流动现象后的流动机理。通过流场拓扑结构和涡系演化分析流场稳定性与对称性的关系。 创新点:1.首次揭示驱动速度比对该流场过渡流临界特性的影响规律;2.从物理层面上阐明流动本质。 方法:1.以均匀直角网格构建计算域,通过基于格子玻尔兹曼方法的数值模拟方法,计算各流动状态发生变化时的临界雷诺数。根据不同驱动速度比,绘制Hopf和Neimark-Sacker流动分岔点以及湍流临界点随速度比的函数图像(图9);2.通过扰动衰减系数、速度相图、速度频谱分析来判断流动是否由定常变为非定常周期性流动,再由周期性流动变为准周期性流动直至演化为湍流;3.通过流场拓扑结构分析流场对称性的破坏与不稳定性的关系;4.通过能量频谱图像分析流动的能量级串现象(图11)。 结论:1.跟预期一样,该流场的稳定性丧失总是伴随着Hopf流动分岔点的出现;2.相较于顶盖驱动内流流场,双边驱动内流流场的稳定性较强,说明第二条边的驱动条件可以有效提高流场的稳定性;3.当时,流场稳定性最强,同时当双边驱动条件相同时可以更好的提高流场稳定性;4.不管驱动速度比如何变,流场始终展现了经典的Ruelle-Takens模式,从定常流动演化至非定常周期性流动,再由周期性流动演化至准周期性流动,最终演化为湍流;5.180度的旋转对称性对于推迟湍流的出现有很大作用。 关键词组: Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article
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