张炫:Structure of turbulence in combined wave-current boundary layers
发布人:彭自然  发布时间:2021-01-04   浏览次数:10

  报告人:张炫

  报告时间:2021179001100

  报告地点:工程学院302会议室

 

  报告内容简介

      This project presents insights into the structure of turbulence in combined wave-current boundary layers, based on experiments performed in flumes of different scale using Particle Image Velocimetry and hydrogen bubble visualisation. Flow conditions covered a range of wave frequencies, wave amplitudes and mean flow conditions. Results show that the spacing between turbulent streaks varies periodically with the passage of each wave, increasing when the flow accelerates and decreasing when the flow decelerates. A new formula has been put forward, relating the streak spacing variation and the wave-induced orbital displacements. The near-wall flow structure suggests a rhythmic pattern in terms of the velocity gradients across the flume. Waves with higher frequencies and larger amplitudes lead to a greater reduction of mean streak spacing, together with a greater increase of the maximum Reynolds shear stress induced by ejections. These results can be useful for better predictions of the hydrodynamics and sediment transport in combined wave-current flows.


  报告人简介

  张炫,博士后,合作导师:郑金海教授。2013年本科毕业于河海大学港航专业,同年获国家公派留学资格赴英国伦敦大学学院(UCL)直博,2018年获UCL博士学位。主要研究方向:波流相互作用理论研究,湍流边界层理论。发表学术论文6篇,其中SCI论文3篇,EI论文2篇。获得欧洲大学联盟水力学实验项目资助、西班牙青年流体力学学者室内大型试验资助、2013-2017年获伦敦大学学院工程学部土木、环境及地理信息工程学院院长奖学金(UCL Dean’s Prize)、YCSEC国际会议优秀论文二等奖。先后主持国家自然科学基金青年科学基金项目、中国博士后科学基金会面上项目、博士后国际交流计划引进项目、江苏省资助招收博士后项目、河海大学中央高校基本科研业务费项目、海岸灾害及防护教育部重点实验室开放研究基金各一项。

 

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海洋生态与环境学院

202114

 
 
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