Numerical Simulation of Maximum Scour Depth of the Riverbed above a Subway Tunnel Crossing the Tidal River

2012 ◽  
Vol 256-259 ◽  
pp. 2548-2551 ◽  
Author(s):  
Jun Chen ◽  
Ai Feng Huang ◽  
Hong Chen ◽  
Yong Tao Li
Keyword(s):  
Numerical Simulation ◽  
Cross Section ◽  
Return Period ◽  
Tidal Current ◽  
Tidal River ◽  
Scour Depth ◽  
Two Dimensional ◽  
Subway Tunnel ◽  
Sediment Transportation ◽  
Hydrologic Condition

To ensure the secure buried depth of the subway tunnel which was routed underneath the Fenghuahe River, a two-dimensional tidal current and sediment transportation model was established to simulate the maximum scour depth of the riverbed. The conclusions were shown as follows: the most disadvantageous hydrologic condition was a combination of the 200-year return period flood in the Fenghuahe River and the 5-year highest tide in the Yonghe River. The maximum scour depth of the riverbed above the subway tunnel was 1.19 m and the lowest elevation of the riverbed cross-section was -8.56m. The results could provide technical support for the safety of subway design.

scholarly journals Numerical simulation study on diffusion of temperature drainage in wide and shallow water in a refinery integration project

2020 ◽  
Vol 206 ◽  
pp. 03008
Author(s):  
LI Yajuan ◽  
Mao Tianyu ◽  
Zhu Yuxin
Keyword(s):  
Numerical Simulation ◽  
Shallow Water ◽  
Temperature Rise ◽  
Tidal Current ◽  
Water Area ◽  
Hydrodynamic Condition ◽  
Two Dimensional ◽  
Current Field ◽  
Convection Diffusion ◽  
Integration Project

The numerical simulation of tidal current field in wide and shallow waters (Naochao River) of Caofeidian industrial zone is carried out by using a two-dimensional hydrodynamic model, taking the discharge problem of temperature and drainage in a refinery integration project as an example. Taking the tidal current field as the hydrodynamic condition of the temperature drainage transport simulation, the concentration distribution of the temperature drainage in the receiving water area was predicted by using the two-dimensional convection-diffusion model of the temperature drainage, and the change of the temperature rise line and its influence were analyzed. The results showed that the water area affected by temperature rise in winter and summer were 0.28km2 and 0.35km2, respectively, when the project was discharged separately. The existing temperature displacement of China Resources Power Plant in the superposition area is: 19.1km2 in winter and 1.64km2 in summer under the influence of temperature rise. By analyzing the influence degree of wide and shallow water (Naochao River) drainage outlet on temperature rise, the conclusion that the layout of drainage outlet should be further optimized is given. conclusion that the layout of drainage outlet should be further optimized is given.

scholarly journals Comparisons of Local Scouring for Submerged Square and Circular Cross-Section Piles in Steady Currents

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1820
Author(s):  
Shengtao Du ◽  
Bingchen Liang
Keyword(s):  
Cross Section ◽  
Boundary Point ◽  
Three Dimensional ◽  
Circular Cross Section ◽  
Scour Depth ◽  
Two Dimensional ◽  
Exponential Equation ◽  
Equilibrium Scour Depth ◽  
Over Time

The local scouring that occurs around submerged vertical piles in steady currents was studied experimentally in this paper. Three experiments were carried out for square cross-section (SC) piles and a circular cross-section (CC) pile with the same width. The key point scour depths, including the center of the upstream boundary point (KC) and the two upstream corners (KM), were observed over time. The two-dimensional profiles and the three-dimensional topography around each pile were measured using a Seatek. The different scouring characteristics of the SC and CC piles were investigated. The experiment results show that the scour depth at KC is much smaller than that of KM. The equilibrium scour depth of the CC pile is far less than that of the SC piles. The scour and deposition distributions were different between the CC and SC piles. The maximum scour depth was found at the lateral rear of the CC pile, and the maximum deposition was observed in sections of the SC piles. The evolutions of the scour depths at KM are predicted using a developed exponential equation.

scholarly journals Numerical Simulation of Flow Through Microchannels with Random Roughness

2021 ◽  
Author(s):  
Małgorzata Kmiotek ◽  
Adrian Kordos ◽  
Tomasz Iwan
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Cross Section ◽  
Circular Cross Section ◽  
Two Dimensional ◽  
Axially Symmetric ◽  
Ansys Fluent ◽  
Random Roughness ◽  
Fluent Software ◽  
Flow Through

The aim of the study is to determine the effect of a randomly generated rough surface on the laminar flow of a fluid in a microchannel. Two-dimensional axially symmetric microchannels with a circular cross-section in the range of Reynolds number Re = 100-1700 were considered. Flow numerical simulations were performed using the Ansys / Fluent software.

Steel Catenary Risers at Touchdown Zone: A Fluid Dynamics Approach to Understanding the Water-Riser-Soil Interaction

2012 ◽  
Author(s):  
Anup Fouzder ◽  
Arash Zakeri ◽  
Bipul Hawlader
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Velocity Field ◽  
Cross Section ◽  
Complex Phenomenon ◽  
Two Dimensional ◽  
Steel Catenary Risers ◽  
Computational Fluid Dynamics Cfd ◽  
Critical Location

The critical location for fatigue damage in Steel Catenary Riser’s (SCR’s) often occurs within the Touchdown Zone (TDZ), where cyclic interaction of the riser with the seabed takes place. Riser-fluid-soil interaction at the TDZ is a complex phenomenon. In this study, Computational Fluid Dynamics (CFD) technique is used to investigate the velocity field and suction forces during riser-fluid-soil interaction for a two-dimensional cross section of 0.10 m diameter SCR at TDZ. Numerical simulation shows that the suction forces at the bottom of the riser are high enough to pull the clay upward when it departs from the seabed during the heave action. The influence of suction and water on trench formation mechanism is discussed.

The Numerical Analysis of Contaminant Migration from Sanitary Landfill Sites

1977 ◽  
Vol 12 (1) ◽  
pp. 233-255
Author(s):  
J.F. Sykes ◽  
A.J. Crutcher
Keyword(s):  
Contaminant Transport ◽  
Cross Section ◽  
Element Model ◽  
Sanitary Landfill ◽  
Saturated Porous Media ◽  
Two Dimensional ◽  
Contaminant Migration ◽  
Southern Ontario ◽  
Galerkin Finite Element ◽  
Chloride Concentrations

Abstract A two-dimensional Galerkin finite element model for flow and contaminant transport in variably saturated porous media is used to analyze the transport of chlorides from a sanitary landfill located in Southern Ontario. A representative cross-section is selected for the analysis. Predicted chloride concentrations are presented for the cross section at various horizon years.

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