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Large-eddy simulation of turbulent f...

Cui, Jie.

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Large-eddy simulation of turbulent flow over rough surfaces.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Large-eddy simulation of turbulent flow over rough surfaces./
Author:	Cui, Jie.
Description:	243 p.
Notes:	Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 4356.
Contained By:	Dissertation Abstracts International61-08B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9984719
ISBN:	0599912014

Large-eddy simulation of turbulent flow over rough surfaces.
Cui, Jie.

Large-eddy simulation of turbulent flow over rough surfaces. - 243 p.

Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 4356.

Thesis (Ph.D.)--The University of Iowa, 2000.

Large-eddy simulation is employed to study turbulent flow over rough surfaces. Three-dimensional, time-dependent, incompressible, filtered Navier-Stokes equations are solved with a dynamic subgrid-scale model using a finite-volume based method. Fully-developed turbulent flow in a two-dimensional channel is used to validate the numerical method, as well as a baseline case to investigate roughness effects.

ISBN: 0599912014Subjects--Topical Terms:

783786
Engineering, Mechanical.

Large-eddy simulation of turbulent flow over rough surfaces.
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020 $a 0599912014
035 $a (UnM)AAI9984719
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040 $a UnM $c UnM
100 1 $a Cui, Jie. $3 1256787
245 1 0 $a Large-eddy simulation of turbulent flow over rough surfaces.
300 $a 243 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 4356.
500 $a Supervisors: Ching-Long Lin; Virendra C. Patel.
502 $a Thesis (Ph.D.)--The University of Iowa, 2000.
520 $a Large-eddy simulation is employed to study turbulent flow over rough surfaces. Three-dimensional, time-dependent, incompressible, filtered Navier-Stokes equations are solved with a dynamic subgrid-scale model using a finite-volume based method. Fully-developed turbulent flow in a two-dimensional channel is used to validate the numerical method, as well as a baseline case to investigate roughness effects.
520 $a The numerical method is applied to turbulent channel flow with the lower wall roughened by sinusoidal waves of varying steepness and rectangular ribs with different spacing. Mean streamwise pressure gradients imposed to drive the flow are adjusted to obtain the same Reynolds number for all cases. Mean and instantaneous flow characteristics differ significantly from flat channel flow.
520 $a Ejection and sweep events dominate flow field and produce the most significant contribution to Reynolds shear stress. Pressure drag has much more impact than friction drag in flow over rough surfaces. When the averaged velocity profile is plotted in the logarithmic format, the downward shift from the law of the wall with the same slope demonstrates roughness effect. Roughness intensifies interactions between flows inside and outside the roughness layer, generate more frequent, bigger and stronger eddies, and impose their own length scale on the near-wall flow field.
520 $a A new force-field model which can handle arbitrary roughness is proposed following the idea of large-eddy simulation. Roughness is decomposed into resolved and subgrid-scale roughness. A Cartesian grid fine enough to resolve the geometric features of the resolved roughness is needed. A force field is used to represent the resolved roughness. This force field is determined during the solution process. For subgrid roughness, a random force model is used. At each grid point within the random roughness elements, a body force is applied to model subgrid roughness effect. Use of the new model is demonstrated by calculation of the flow over a wavy boundary with superimposed fine-grain roughness.
590 $a School code: 0096.
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0548
710 2 0 $a The University of Iowa. $3 1017439
773 0 $t Dissertation Abstracts International $g 61-08B.
790 $a 0096
790 1 0 $a Lin, Ching-Long, $e advisor
790 1 0 $a Patel, Virendra C., $e advisor
791 $a Ph.D.
792 $a 2000
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9984719