Direct Numerical Simulations on Influences of Buoyancy Forces on Turbulent Flow

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Direct Numerical Simulations on Influences of Buoyancy Forces on Turbulent Flow

更新时间：2025-07-09

- Direct Numerical Simulations on Influences of Buoyancy Forces on Turbulent Flow
- Vol. 44, Issue 9, Pages: 11-15(2010)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK121
- Online First：10 September 2010，
  
  Published：2010
- 稿件说明：
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Direct Numerical Simulations on Influences of Buoyancy Forces on Turbulent Flow[J]. 2010, 44(9): 11-15.
DOI：

Direct Numerical Simulations on Influences of Buoyancy Forces on Turbulent Flow[J]. 2010, 44(9): 11-15. DOI：

摘要

采用直接数值模拟方法对绕截面中心轴旋转的方通道内的充分发展湍流进行了数值模拟

湍流雷诺数和普朗特数分别为400和0.71.为了分析浮升力对流体运动的影响

给出了不同格拉晓芙数Gr下的主流平均速度场、温度场、二次流、湍流强度、雷诺应力等湍流统计量的分布情况

并对旋转效应的稳定与否以及由此对湍流统计量的影响进行了分析.结果表明:旋转效应稳定的区域湍流受到抑制

旋转效应不稳定的区域湍流增强

随Gr的增加旋转效应稳定性变得更加复杂; 浮升力对流场和温度场有明显的影响

随Gr的增加影响更加明显.

Abstract

Direct numerical simulations were performed for a fully developed axially rotating turbulent square duct flow with a turbulent Reynolds number of 400 and a Prandtl number of 0.71. In order to analyze the influences of buoyancy forces on fluid flow

the ensemble averaged turbulent statistical quantities including velocity field

temperature field

turbulent intensity

and Reynolds stress at different Grashof numbers were presented. The stability or instability properties of rotation and their effects on the statistical quantities were also analyzed. The results show that the centrifugal buoyancy influences the averaged velocity field and temperature field significantly and the influence is more obvious with the increase in Grashof number. The centrifugal buoyancy also affects the fluctuation quantities greatly

and the fluctuation intensity increases in the instable side and decreases in the stable side.

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references

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Related Author

马良栋 1

李增耀 1

陶文铨 1

陶文铨 2

阳祥 1

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