The Research of Flow Resistance Property in the Tugging and Mooring of Tube Segment

2014 ◽  
Vol 580-583 ◽  
pp. 2150-2153
Author(s):  
Zheng Zhong Qiu ◽  
Min Dong
Keyword(s):  
Numerical Simulation ◽  
Empirical Data ◽  
Flow Resistance ◽  
Resistance Coefficient ◽  
Pearl River ◽  
Immersed Tunnel ◽  
Fluent Software ◽  
The Difference ◽  
The Pearl River ◽  
Tube Segment

The tube tugging and mooring is the key step in the process of the immersed tunnel, and the most important theoretical is the calculation of water flow force. According to the numerical simulation and physical model of the tube in the Pearl River, the difference value of the flow resistance coefficient can be calculated. The fluent software is used to simulate the process of the tube tugging and mooring. On the basis of the empirical data of the tube experiment in the Pearl River, the flow resistance coefficient is obtained in the process of the tube tugging.

The Design, Numerical Simulation and Experimental Research on Low Resistance Diffluence T-Junction

2012 ◽  
Vol 192 ◽  
pp. 237-241
Author(s):  
Hai Kun Tao ◽  
Yong Zhou ◽  
Zhi Guo Wei ◽  
Hao Zhang ◽  
Yong Li
Keyword(s):  
Numerical Simulation ◽  
Flow Resistance ◽  
Experimental Testing ◽  
Internal Flow ◽  
Resistance Coefficient ◽  
Vortex Generation ◽  
High Effectiveness ◽  
Low Resistance ◽  
Fluid Resistance ◽  
New Type

A new type of diffluence T-junction with low-resistance was designed to reduce the flow resistance coefficient. After the numerical simulation on internal flow field for both the traditional and newly-invent T-junction, an analysis was made on their flow pattern, and their fluid resistance coefficient was computed. At last, the actual fluid resistance was measured respectively. It shows that: the results from numerical simulation agree well to those got in experimental testing. Furthermore, the flow resistance coefficient of T-junction is decreased from 1.13 to 0.61 after redesign, which indicates high effectiveness of this process. The mechanism is that smoothness for branch can inhibit the vortex generation efficiently and greatly reduce its flow resistance coefficient, which consequently reduces the gross flow resistance

The Selection of the Difference Scheme in Numerical Simulation of Low-Rise Gable Roof Surface Pressure

2013 ◽  
Vol 711 ◽  
pp. 344-347
Author(s):  
Jian Feng Wu ◽  
Cai Hua Wang ◽  
Xue Qin Zhang
Keyword(s):  
Numerical Simulation ◽  
Surface Wind ◽  
Wind Pressure ◽  
Building Structures ◽  
Convective Term ◽  
Shape Coefficient ◽  
Fluent Software ◽  
The Difference ◽  
Load Shape ◽  
Selection Of

Using the FLUENT software, this paper taking the wind load shape coefficient in the current code for the design of building structures as the comparison standard, have numerical wind tunnel simulation of the wind the surface wind pressure on low layer double slope roof. It focused on the effect of four convective term difference schemes on the numerical simulation, such as First-Order Upwind, Second-Order Upwind, Power Law and Quadratic Upwind Interpolation for ConvectiveKinematics. It provided reasonable reference for selection of convective term difference format.

Control survey for a 6.7 km immersed tunnel in Chinese Lingding ocean

2019 ◽  
Vol 13 (3) ◽  
pp. 257-265 ◽  
Author(s):  
Guanqing Li ◽  
Shengxiang Huang
Keyword(s):  
Hong Kong ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
The West ◽  
Control Networks ◽  
Surface Control ◽  
Immersed Tunnel ◽  
Control Survey ◽  
The Pearl River

AbstractThe immersed tunnel which is composed of elements has drawn more attention nowadays because of new advancements and developments. The elements are prefabricated somewhere else and floated to the tunnel site to be sunk into the prepared trench. Each element must line up exactly for the watertight gaskets to seal properly. The HZM immersed tunnel, a key part of the Hong Kong-Zhuhai-Macao Bridge (HZMB) that crosses the Pearl River Estuary and links Hong Kong to the east, and Zhuhai and Macao to the west, is 6.7 km long, one of the longest immersed tunnel ever realized in the world. For the construction of such a mega immersed tunnel, particular care should be taken in the perspective of geodetic control. This paper described the design and implementation of the geodetic basis and hierarchical surface control networks. And to decrease the influence of lateral refraction and to improve the configuration strength and increase the number of redundant observation compared with traverse, the design of underground surveying network named duo-linear joint chain and the results of gyro checks are presented. In the end HZM immersed tunnel surveying data is analyzed and the performance of the control networks is demonstrated.

EVOLUTION OF SEDIMENTARY FACIES AND PALEOENVIRONMENT DURING THE LATE QUATERNARY IN WANQINGSHA AREA OF THE PEARL RIVER DELTA

2010 ◽  
Vol 29 (6) ◽  
pp. 35-42
Author(s):  
Jianhua WANG ◽  
Linglong CAO ◽  
Xiaojing WANG ◽  
Xiaoqiang YANG ◽  
Jie YANG ◽  
...  
Keyword(s):  
Pearl River Delta ◽  
Late Quaternary ◽  
Sedimentary Facies ◽  
River Delta ◽  
Pearl River ◽  
The Pearl River Delta ◽  
The Pearl River
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