• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Two-Dimensional Separated Flow: Experiment and Discrete Vortex Dynamics Simulation
【24h】

Two-Dimensional Separated Flow: Experiment and Discrete Vortex Dynamics Simulation

机译：二维分离流动：实验和离散涡动力学模拟

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An experimental and theoretical investigation of turbulent flow over a two-dimensional backward-facing step is described. A Laser Doppler Anemometer (LDA) was used to measure the time-averaged flow properties and their fluctuations in an open-water-channel test section. Experimental results include the flow and normal-direction velocities (mean and root mean square), Reynolds shear stress, and separated-flow length. The variation of the reattachment location was also obtained as a function of Reynolds number and flow expansion ratio. Flow visualization was employed to gain further understanding of the flow structure. The paper also describes numerical results obtained with a method known as discrete vortex dynamics. This method provides a Lagrangian description of fluid flow in which the distribution of vorticity is discretized and its time-dependent motion is calculated. Thus, unsteady flow phenomena can be included within this time-dependent computational method. From a comparison of the experimental and numerical results it was concluded that, while qualitative agreement has been obtained, for close quantitative agreement with separated-flow data, a purely two-dimensional calculation requires a dissipation model. This model must provide the dissipation caused by small-scale three-dimensional vorticity. (ERA citation 06:002737)

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