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Research on Numerical Simulation of the Impact of the Length of Transition of Continuous Meandering River on Navigation

Author: ZhangQingSong
Tutor: HuXuYue
School: Changsha University of Science and Technology
Course: Hydraulics and River Dynamics
Keywords: Continuous curve Numerical Simulation Rudder angle Drift angle Width for navigation Transition section Navigable scale
CLC: U697
Type: Master's thesis
Year: 2011
Downloads: 15
Quote: 1
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Abstract


The transition line segments as a continuous curve before and after the connection of the two curved part, have an important impact on the flow characteristics of the continuous curve and ship navigation. Meandering rivers flow structure and characteristics of flow and sediment movement research has been more reports, scholars have basically mastered the bending movement of the river flow mechanism and evolution. But the study is not perfect for of navigable flow and navigation conditions in a continuous curve, especially the transition to a continuous curve of the length of the line segment on navigation even fewer. The main purpose of this paper is a continuous curve of the the different transition section length of navigable water and ship navigation test the length of the transition section of the continuous curve analysis and discussion of the transition section of the continuous curve length minimum navigable scale. In this paper, the physical model test data validation based on the use of three-dimensional flow model and MMG ship maneuvering motion mathematical model for simulation of continuous curve of navigable flow and ship navigation respectively, calculated the impact of the different length of the transition section of the water flow and navigation of continuous curve , before and after the discussion to make two separate minimum bend navigable scale. The main contents and conclusions of the study are: (1) verified by physical model test data show that the three-dimensional flow model used in this study and MMG ship maneuvering mathematical model can simulate the the inland shipping class III fairway continuous bend flow and ship motion. (2) by calculation consecutive bend flow, found some special phenomenon in the flow of a continuous curve; continuous curve through a different transition section comparison of Flow Movement Law found that the size of the length of the transition section after bending circulation and transition section near surface reflux impact, and defines the length of the critical transition from the perspective of the flow characteristics. (3) When the ship back and forth through the continuous curve bend the same channel width required that the independence of the two corners, and the transition section length is defined as the length of the navigable critical transition segment. Through discussion, the the navigable critical transition length the smallest navigable scale continuous curve. (4) Ship Maneuvering mathematical model, found that the transition section of the continuous curve the minimum navigable scales with increasing central angle of a continuous curve, decreases with the increase of the bending radius of a continuous curve; calculated continuous curved Road transition length data were fitted minimum navigable scale and experience drawn continuous curve transition section length relationship.

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