Estimation of characteristic vortex structures in complex flow

IF 1.5 4区工程技术 Q3 MECHANICS

Journal of Turbulence Pub Date : 2021-05-28 DOI:10.1080/14685248.2021.1932939

K. Chaudhury, Chandranath Banerjee, Swapnil Urankar

引用次数: 1

Abstract

ABSTRACT We present a systematic approach to extract the characteristic vortex region that contains the essential features of a complex flow field. The process involves the analysis of the complex eigenvalues of the velocity gradient tensor. In particular, we propose the analysis using the joint and marginal probability distributions of the complex eigenvalues of the velocity gradient tensor that preserves the sufficient swirling strength and the required orbital compactness of the swirling orbits defining the vortex region. We consider three complex flow scenarios for the application and the assessment of the proposed approach: (i) rotating Rayleigh–Benard convection, (ii) turbulent channel flow, (iii) turbulent flow field in a cylindrical cyclonic separator. While problem (i) is considered for the extraction of subsumed cyclonic structure, problems (ii) and (iii) are reminiscent of wall-bounded turbulent flows, relevant for different industrial applications.

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复杂流中特征涡结构的估计

摘要：我们提出了一种系统的方法来提取包含复杂流场基本特征的特征涡流区域。该过程涉及对速度梯度张量的复特征值的分析。特别地，我们提出了使用速度梯度张量的复特征值的联合概率分布和边际概率分布的分析，该分析保持了定义涡流区域的涡流轨道的足够的涡流强度和所需的轨道紧凑性。我们考虑了三种复杂的流动场景来应用和评估所提出的方法：（i）旋转瑞利-贝纳德对流，（ii）湍流通道流，（iii）圆柱形旋风分离器中的湍流场。虽然问题（i）被考虑用于提取包含的气旋结构，但问题（ii）和（iii）让人想起了与不同工业应用相关的壁面湍流。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Turbulence 物理-力学

CiteScore

3.90

自引率

5.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Turbulence is a physical phenomenon occurring in most fluid flows, and is a major research topic at the cutting edge of science and technology. Journal of Turbulence ( JoT) is a digital forum for disseminating new theoretical, numerical and experimental knowledge aimed at understanding, predicting and controlling fluid turbulence. JoT provides a common venue for communicating advances of fundamental and applied character across the many disciplines in which turbulence plays a vital role. Examples include turbulence arising in engineering fluid dynamics (aerodynamics and hydrodynamics, particulate and multi-phase flows, acoustics, hydraulics, combustion, aeroelasticity, transitional flows, turbo-machinery, heat transfer), geophysical fluid dynamics (environmental flows, oceanography, meteorology), in physics (magnetohydrodynamics and fusion, astrophysics, cryogenic and quantum fluids), and mathematics (turbulence from PDE’s, model systems). The multimedia capabilities offered by this electronic journal (including free colour images and video movies), provide a unique opportunity for disseminating turbulence research in visually impressive ways.