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arXiv 2401.14740physics.flu-dynmath-phmath.MP
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流经柔顺壁面的可压缩流动的无粘稳定性

Inviscid stability of compressible flows past compliant surfaces

Mandeep Deka, Gaurav Tomar, Viswanathan Kumaran

AI总结:

本研究将经典无粘稳定性定理推广至流经柔顺壁面的可压缩流动,修正了耗散型柔顺壁面下的广义拐点准则,推导了不稳定模态波速界值定理与非耗散壁面下中性模态存在的新准则,发现可压缩流中耗散壁面也可存在无临界点的中性模态。

摘要:

经典无粘稳定性定理已被推广应用于流经柔顺壁面的可压缩流动。我们将正规模态施加于以弹簧支撑板为模型的柔顺壁面的平行平面可压缩流动,通过分析无粘方程推导相关定理。研究表明,可压缩刚性壁面流动的广义拐点准则在流经耗散型柔顺壁面的流动中得到修正。我们推导了无粘极限下不稳定模态波速的界值定理,这些定理与不可压缩柔顺壁面流动的相关定理相似,但与可压缩刚性壁面流动的定理存在差异。针对流经非耗散型柔顺壁面的可压缩流动,我们推导了波速超出基流速度最小与最大值范围的中性模态存在性的新准则。研究证实,在外部可压缩流动中,即便存在耗散型柔顺壁面,无临界点的中性模态也可存在,这一现象在不可压缩极限下并不存在。

英文摘要:

The classical theorems of inviscid stability have been extended for compressible flows past compliant surfaces. We consider normal modes imposed on a plane parallel compressible flow past compliant walls modelled as spring-backed plates and analyze the inviscid equations to derive the theorems. We show that the generalised inflection point criteria of compressible rigid wall flows is modified for flows past dissipative compliant walls. Theorems on the bounds for the wave-speed for unstable modes in the inviscid limit are derived. These are similar to the ones for incompressible compliant wall flows, but are different from compressible rigid wall flows. A new criterion for existence of neutral modes with wave-speeds outside the range of minimum and maximum base velocities is derived for compressible flows past non-dissipative compliant walls. We show that in external compressible flows, neutral modes without a critical point can exist even with dissipative compliant walls, which is not the case in the incompressible limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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