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Numerical modeling of diversion flows.

Neary, Vincent Sinclair.

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Numerical modeling of diversion flows.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Numerical modeling of diversion flows./
作者:	Neary, Vincent Sinclair.
面頁冊數:	216 p.
附註:	Source: Dissertation Abstracts International, Volume: 57-01, Section: B, page: 0675.
Contained By:	Dissertation Abstracts International57-01B.
標題:	Engineering, Aerospace. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9614660

Numerical modeling of diversion flows.
Neary, Vincent Sinclair.

Numerical modeling of diversion flows. - 216 p.

Source: Dissertation Abstracts International, Volume: 57-01, Section: B, page: 0675.

Thesis (Ph.D.)--The University of Iowa, 1995.

This study was driven by the power industry's need to develop more effective and economical solutions for sediment deposition and flow asymmetry (uneven flow distribution) problems at water intakes adjoining alluvial rivers. Further knowledge of these problems may be gained, and more rational methods for predicting and mitigating them may be developed, through detailed simulations using Computational Fluid Dynamics (CFD) models that: (i) solve the fully-three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations; (ii) employ advanced near-wall turbulence closures that resolve the flow in the viscous sub-layer and buffer-layer and model roughness effects; and (iii) employ computational meshes with a sufficient number of grid nodes to resolve the principal sources of vorticity and the high gradients near the solid boundaries.Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Numerical modeling of diversion flows.
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100 1 $a Neary, Vincent Sinclair. $3 1256826
245 1 0 $a Numerical modeling of diversion flows.
300 $a 216 p.
500 $a Source: Dissertation Abstracts International, Volume: 57-01, Section: B, page: 0675.
500 $a Supervisors: A. Jacob Odgaard; Fotis Sotiropoulos.
502 $a Thesis (Ph.D.)--The University of Iowa, 1995.
520 $a This study was driven by the power industry's need to develop more effective and economical solutions for sediment deposition and flow asymmetry (uneven flow distribution) problems at water intakes adjoining alluvial rivers. Further knowledge of these problems may be gained, and more rational methods for predicting and mitigating them may be developed, through detailed simulations using Computational Fluid Dynamics (CFD) models that: (i) solve the fully-three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations; (ii) employ advanced near-wall turbulence closures that resolve the flow in the viscous sub-layer and buffer-layer and model roughness effects; and (iii) employ computational meshes with a sufficient number of grid nodes to resolve the principal sources of vorticity and the high gradients near the solid boundaries.
520 $a The CFD model that is developed herein solves the three-dimensional RANS equations for an incompressible fluid in generalized, boundary-fitted, non-orthogonal coordinates by employing an implicit fractional step method in conjunction with an Alternate Direct Implicit (ADI) approximate factorization. Closure of the RANS equations is accomplished by using k-$\omega$ near-wall turbulence models, which can simulate equivalent sandgrain roughness effects. This turbulence closure with roughness effects has not previously been employed for three-dimensional flows of such complexity.
520 $a Validation is accomplished by comparing the predicted results with experimental measurements of both laminar and turbulent flows in diversions composed of closed ducts and open-channels. A parametric study is conducted to measure the effects of discharge ratio, aspect ratio and main channel bed roughness on the three-dimensional flow features exhibited by these flows.
590 $a School code: 0096.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Sanitary and Municipal. $3 1018731
650 4 $a Hydrology. $3 545716
690 $a 0388
690 $a 0538
690 $a 0554
710 2 0 $a The University of Iowa. $3 1017439
773 0 $t Dissertation Abstracts International $g 57-01B.
790 $a 0096
790 1 0 $a Odgaard, A. Jacob, $e advisor
790 1 0 $a Sotiropoulos, Fotis, $e advisor
791 $a Ph.D.
792 $a 1995
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9614660