A 3D analytical model for vortex velocity field based on spiral streamline pattern  

作　　者：Maryam Azarpira Amir Reza Zarrati 

机构地区：[1]Department of Civil and Environmental Engineering, Amirkabir University of Technology

出　　处：《Water Science and Engineering》2019年第3期244-252,共9页水科学与水工程（英文版）

基　　金：supported by the Iran National Science Foundation(INSF,Grant No.97008045)

摘　　要：Vortices that develop over intakes are a hazardous hydraulic phenomenon.In this study, a 3D model was developed to study the flow field in air-core vortices.This model is based on the spiral pattern of streamlines and the analytical solution of the momentum and continuity equations for deriving the three components of velocity.The model provides equations for free surface profiles and 3D patterns of the streamlines.Moreover, a new relationship was suggested for calculating effective viscosity and its distribution across the vortex flow field.The performance of the proposed analytical model was compared with existing experimental data and the results of previous analytical models.The outcomes indicated that the proposed model could predict characteristics of the vortex flow with good accuracy.Vortices that develop over intakes are a hazardous hydraulic phenomenon.In this study,a 3D model was developed to study the flow field in air-core vortices.This model is based on the spiral pattern of streamlines and the analytical solution of the momentum and continuity equations for deriving the three components of velocity.The model provides equations for free surface profiles and 3D patterns of the streamlines.Moreover,a new relationship was suggested for calculating effective viscosity and its distribution across the vortex flow field.The performance of the proposed analytical model was compared with existing experimental data and the results of previous analytical models.The outcomes indicated that the proposed model could predict characteristics of the vortex flow with good accuracy.

关 键 词：Air-core VORTICES Analytical model VELOCITY distribution SPIRAL STREAMLINES Free surface profile 

分 类 号：TV[水利工程]