JONSWAP波环境下湍动射流三维大涡模拟研究  

Three-dimensional Large Eddy Simulation of Turbulent Jet in JONSWAP Waves

作　　者：鲁俊[1] 王玲玲[1] 丁全林[2] 戴会超[1] 

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学环境科学与工程学院,江苏南京210098

出　　处：《四川大学学报（工程科学版）》2010年第4期48-54,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50679023);教育部博士点基金资助项目(20070294012);江苏省青蓝工程资助项目;河海大学优秀博士论文培育计划

摘　　要：在σ坐标下,采用分步算法求解3维滤波后的N-S方程,其中亚格子模型采用作者提出的动力拟序涡粘性模型封闭。数值模拟了波动环境下湍动射流问题。其数值计算结果与实验值和理论值吻合良好。分析了JON-SWAP波环境下垂直湍动射流回流区域拟涡能分布特性以及JONSWAP波作用下射流掺混特性;给出了射流掺混图像和射流对JONSWAP波波能损耗影响特性。成果为随机波作用下污染物排放的掺混与稀释特性研究提供了手段与理论依据。A three-dimensional numerical model for solving JONSWAP waves and jets in σ -coordinate was developed using large eddy simulation technology,in which the dynamic coherent eddy model was used. The operator splitting method was used to solve the Navier-Stokes equations. After the model was verified with the experimental results of the jet in regular waves,the model was used to simulate the vertical turbulent jet in JONSWAP wave environments. Investigation was done for the distribution of the enstophy of the core of vorticity in the backzone. The mixing process was found to be governed by entrainment and jet-wave interaction. The mechanism of jet instantaneous characteristic in JONSWAP wave was also investigated. The numerical results are of great theoretical importance for the understanding of jet turbulent behaviors in JONSWAP wave.

关 键 词：大涡模拟 JONSWAP波谱 湍流射流 动力拟序涡粘性模型 

分 类 号：O352[理学—流体力学]