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Numerical simulation of complex chan...

Zhao, Gang.

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Numerical simulation of complex channel flows.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Numerical simulation of complex channel flows./
作者:	Zhao, Gang.
面頁冊數:	150 p.
附註:	Advisers: Robert L. Street; Peter K. Kitanidis.
Contained By:	Dissertation Abstracts International68-06B.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3267674
ISBN:	9780549064046

Numerical simulation of complex channel flows.
Zhao, Gang.

Numerical simulation of complex channel flows. - 150 p.

Advisers: Robert L. Street; Peter K. Kitanidis.

Thesis (Ph.D.)--Stanford University, 2007.

A three-dimensional non-hydrostatic numerical code has been enhanced and applied to simulate flows in prismatic and natural channels. Compared to field measurements, three-dimensional numerical simulations can provide high-resolution data of the flow field, which can improve our understanding of the dynamics of the flow. Simulation results can also provide guidelines for engineering projects.

ISBN: 9780549064046Subjects--Topical Terms:

783781
Engineering, Civil.

Numerical simulation of complex channel flows.
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100 1 $a Zhao, Gang. $3 1272553
245 1 0 $a Numerical simulation of complex channel flows.
300 $a 150 p.
500 $a Advisers: Robert L. Street; Peter K. Kitanidis.
500 $a Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 4053.
502 $a Thesis (Ph.D.)--Stanford University, 2007.
520 $a A three-dimensional non-hydrostatic numerical code has been enhanced and applied to simulate flows in prismatic and natural channels. Compared to field measurements, three-dimensional numerical simulations can provide high-resolution data of the flow field, which can improve our understanding of the dynamics of the flow. Simulation results can also provide guidelines for engineering projects.
520 $a Schemes and elements suitable for simulation of complex channel flows were added to an existing three-dimensional non-hydrostatic numerical code. Major code enhancements include a radiation boundary condition for the free surface, a predictor-corrector scheme for the free surface solver, a large eddy simulation turbulence model, and the Eulerian-Lagrangian method for momentum advection. The scalar transport scheme has also been modified to conserve scalars globally.
520 $a The modified code is applied to simulate the flow in a lab-scale meandering compound channel. Simulated velocity fields are in good agreement with experimental data, except at regions close to the free surface, where the calculated streamwise velocity is too high. Both the rotating direction and the magnitude of the secondary circulation are well predicted by the simulation. The simulation captures the sharp surface gradient located just downstream of a bend apex, which has been observed in experiments. The bottom shear stress is obtained with high resolution over the entire domain, and possible scour of bottom sediment particles is estimated.
520 $a The code is then applied to simulate the tidally-generated currents in Elkhorn Slough, CA. The area of wetlands at Elkhorn Slough is decreasing partly due to tidal erosion. Three-dimensional numerical simulation is a useful tool to study the flow field in Elkhorn Slough, which is an important step in wetland restoration projects. However, numerical simulations are challenged to accurately account for the complex geometry of the channel and the significant wetting and drying of the mudflat and marsh areas. The newly added ELM scheme improves the stability of the code under wetting and drying. The predicted free surface elevation and velocity of the tidal currents are in reasonable agreement with measured data. The effect of the bottom roughness height on the velocity profile has also been explored in our simulation.
590 $a School code: 0212.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Hydrology. $3 545716
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710 2 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 68-06B.
790 $a 0212
790 1 0 $a Kitanidis, Peter K., $e advisor
790 1 0 $a Street, Robert L., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3267674