• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>7th Biennial Conference on Engineering Systems Design and Analysis 2004(ESDA 2004) vol.1: Advanced Energy Systems; Advanced Heat Transfer in Engineering Systems; ... >PREDICTION OF DEVELOPING TURBULENT FLOW IN A90° CURVED DUCT USING LINEAR AND NONLINEAR LOW-RE k-ε MODELS
【24h】

PREDICTION OF DEVELOPING TURBULENT FLOW IN A90° CURVED DUCT USING LINEAR AND NONLINEAR LOW-RE k-ε MODELS

机译：线性和非线性LOW-REk-ε模型预测A90°弯管中湍流的发展

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper reports the outcome of applying two different low-Re number eddy-viscosity models to resolve the complex three-dimensional motion that arises in turbulent flow in a square cross-section duct passing around a 90° bend. Flow computations have been obtained using a three-dimensional, non-orthogonal flow solver. For modeling of turbulence, the Launder and Sharma low-Re k-ε model and a recently modified version of nonlinear low-Re k-ε model that have been shown to be suitable for flow and thermal predictions in re-circulating and impinging jet flows, have been employed. A bounded version of the QUICK scheme was used for the approximation of convection in all transport equations. The numerical predictions are validated through comparisons with the reported flow measurements and are used to explain how the curvature influences the flow development. The results of the present investigation indicate that the curvature induces a strong secondary flow in the curved section of the duct. The secondary motion also persists downstream of the bend, although it slowly disappears with the main stream development. At the entrance of the curved section, the curvature alters the flow development by displacing the fluid towards the convex (inner) wall. Comparisons of the predicted stream-wise and cross-stream velocity components with the measured data indicate that both turbulence models employed in the present study can produce reasonable predictions, although the non-linear model predictions are generally closer to the measurements. Both turbulence models successfully reproduce the distribution as well as the levels of the local pressure coefficient in the curved section of the duct.
机译：本文报告了应用两种不同的低Re数涡流粘度模型解决绕过90°弯角的方形截面管道中湍流中产生的复杂三维运动的结果。流量计算已使用三维非正交流量求解器获得。对于湍流建模，Launder和Sharma低Rek-ε模型以及非线性低Rek-ε模型的最新修改版已被证明适用于再循环和撞击射流的流动和热预测，已被雇用。 QUICK方案的有界形式用于所有输运方程中的对流近似。通过与所报告的流量测量结果进行比较来验证数值预测，并用于解释曲率如何影响流量发展。本研究的结果表明，曲率在管道的弯曲部分中引起强烈的二次流。次级运动在弯道的下游也持续存在，尽管随着主流的发展而逐渐消失。在弯曲部分的入口处，曲率通过将流体移向凸（内）壁来改变流动发展。预测的水流和横流速度分量与实测数据的比较表明，尽管非线性模型的预测通常更接近于测量值，但本研究中使用的两种湍流模型都可以产生合理的预测。两种湍流模型都成功地再现了管道弯曲部分的分布以及局部压力系数的水平。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号