壁面粗糙度对圆柱体超音速流动的影响

IF 1.7 4区 工程技术 Q3 MECHANICS
A. Blanco-Casares, G. B. Jacobs
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引用次数: 2

摘要

本文对雷诺数为500的圆柱超声速流动中壁面粗糙度的影响进行了全面系统的计算研究。利用ANSYS Fluent进行了流场仿真。壁面粗糙度是通过圆柱几何形状的扰动来模拟的,具有不同振幅和频率的谐波模态。在一定马赫数和雷诺数范围内,有滑移壁面和无滑移壁面的光滑圆柱流动模拟可作为参考。粗糙度表明,通过置换沿粗糙度元素的峰值的外部流动,增加了气缸的有效直径和阻力。对于较低的频率,这种影响不像较高的粗糙度频率那么明显。对于光滑圆柱,涡度主要由粘性剪切力产生,而对于粗糙圆柱,斜压涡度的产生占主导地位,并决定了再循环区域的拓扑结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Wall roughness effects on the supersonic flow over a circular cylinder

Wall roughness effects on the supersonic flow over a circular cylinder

A comprehensive and systematic, computational investigation is presented on the effect of wall roughness on the supersonic flow over a circular cylinder with a Reynolds number of 500. Flow simulations are conducted using ANSYS Fluent. Wall roughness is modeled by a perturbation of the cylinder geometry with harmonic modes of varying amplitude and frequency. Validated smooth cylinder flow simulations for a range of Mach and Reynolds numbers with slip and no-slip wall serve as a reference. Roughness is shown to increase the effective diameter of the cylinder and the drag by displacing the outer flow along the peaks of the roughness elements. For lower frequencies, this effect is less pronounced than for higher roughness frequencies. While for smooth cylinders the vorticity is mostly generated by viscous shear forces, for rough cylinder the baroclinic vorticity generation is shown to be dominant and shown to determine the topology of the recirculating region.

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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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