語系:
繁體中文
English
說明(常見問題)
回圖書館首頁
手機版館藏查詢
登入
回首頁
切換:
標籤
|
MARC模式
|
ISBD
PDF modeling of turbulent flows on u...
~
George Mason University.
FindBook
Google Book
Amazon
博客來
PDF modeling of turbulent flows on unstructured grids.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
PDF modeling of turbulent flows on unstructured grids./
作者:
Bakosi, Jozsef.
面頁冊數:
200 p.
附註:
Adviser: Zafer Boybeyi.
Contained By:
Dissertation Abstracts International69-06B.
標題:
Atmospheric Sciences. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3313843
ISBN:
9780549673354
PDF modeling of turbulent flows on unstructured grids.
Bakosi, Jozsef.
PDF modeling of turbulent flows on unstructured grids.
- 200 p.
Adviser: Zafer Boybeyi.
Thesis (Ph.D.)--George Mason University, 2008.
The algorithm is validated and tested by computing three different turbulent flows: the fully developed turbulent channel flow, a street canyon (or cavity) flow and the turbulent wake behind a circular cylinder at a sub-critical Reynolds number.
ISBN: 9780549673354Subjects--Topical Terms:
1019179
Atmospheric Sciences.
PDF modeling of turbulent flows on unstructured grids.
LDR
:04759nmm 2200349 a 45
001
862826
005
20100721
008
100721s2008 ||||||||||||||||| ||eng d
020
$a
9780549673354
035
$a
(UMI)AAI3313843
035
$a
AAI3313843
040
$a
UMI
$c
UMI
100
1
$a
Bakosi, Jozsef.
$3
1030684
245
1 0
$a
PDF modeling of turbulent flows on unstructured grids.
300
$a
200 p.
500
$a
Adviser: Zafer Boybeyi.
500
$a
Source: Dissertation Abstracts International, Volume: 69-06, Section: B, page: 3801.
502
$a
Thesis (Ph.D.)--George Mason University, 2008.
520
$a
The algorithm is validated and tested by computing three different turbulent flows: the fully developed turbulent channel flow, a street canyon (or cavity) flow and the turbulent wake behind a circular cylinder at a sub-critical Reynolds number.
520
$a
In probability density function (PDF) methods of turbulent flows, the joint PDF of several flow variables is computed by numerically integrating a system of stochastic differential equations for Lagrangian particles. Because the technique solves a transport equation for the PDF of the velocity and scalars, a mathematically exact treatment of advection, viscous effects and arbitrarily complex chemical reactions is possible; these processes are treated without closure assumptions. A set of algorithms is proposed to provide an efficient solution of the PDF transport equation modeling the joint PDF of turbulent velocity, frequency and concentration of a passive scalar in geometrically complex configurations. An unstructured Eulerian grid is employed to extract Eulerian statistics, to solve for quantities represented at fixed locations of the domain and to track particles. All three aspects regarding the grid make use of the finite element method. Compared to hybrid methods, the current methodology is stand-alone, therefore it is consistent both numerically and at the level of turbulence closure without the use of consistency conditions. Since both the turbulent velocity and scalar concentration fields are represented in a stochastic way, the method allows for a direct and close interaction between these fields, which is beneficial in computing accurate scalar statistics.
520
$a
Boundary conditions implemented along solid bodies are of the free-slip and no-slip type without the need for ghost elements. Boundary layers at no-slip boundaries are either fully resolved down to the viscous sublayer, explicitly modeling the high anisotropy and inhomogeneity of the low-Reynolds-number wall region without damping or wall-functions or specified via logarithmic wall-functions. As in moment closures and large eddy simulation, these wall-treatments provide the usual trade-off between resolution and computational cost as required by the given application.
520
$a
Particular attention is focused on modeling the dispersion of passive scalars in inhomogeneous turbulent flows. Two different micromixing models are investigated that incorporate the effect of small scale mixing on the transported scalar: the widely used interaction by exchange with the mean and the interaction by exchange with the conditional mean model. An adaptive algorithm to compute the velocity-conditioned scalar mean is proposed that homogenizes the statistical error over the sample space with no assumption on the shape of the underlying velocity PDF. The development also concentrates on a generally applicable micromixing timescale for complex flow domains.
520
$a
Several newly developed algorithms are described in detail that facilitate a stable numerical solution in arbitrarily complex flow geometries, including a stabilized mean-pressure projection scheme, the estimation of conditional and unconditional Eulerian statistics and their derivatives from stochastic particle fields employing finite element shapefunctions, particle tracking through unstructured grids, an efficient particle redistribution procedure and techniques related to efficient random number generation.
520
$a
The solver has been parallelized and optimized for shared memory and multi-core architectures using the OpenMP standard. Relevant aspects of performance and parallelism on cache-based shared memory machines are discussed and presented in detail. The methodology shows great promise in the simulation of high-Reynolds-number incompressible inert or reactive turbulent flows in realistic configurations.
590
$a
School code: 0883.
650
4
$a
Atmospheric Sciences.
$3
1019179
650
4
$a
Engineering, Mechanical.
$3
783786
650
4
$a
Physics, Fluid and Plasma.
$3
1018402
690
$a
0548
690
$a
0725
690
$a
0759
710
2
$a
George Mason University.
$3
1019450
773
0
$t
Dissertation Abstracts International
$g
69-06B.
790
$a
0883
790
1 0
$a
Boybeyi, Zafer,
$e
advisor
791
$a
Ph.D.
792
$a
2008
856
4 0
$u
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3313843
筆 0 讀者評論
館藏地:
全部
電子資源
出版年:
卷號:
館藏
1 筆 • 頁數 1 •
1
條碼號
典藏地名稱
館藏流通類別
資料類型
索書號
使用類型
借閱狀態
預約狀態
備註欄
附件
W9076206
電子資源
11.線上閱覽_V
電子書
EB W9076206
一般使用(Normal)
在架
0
1 筆 • 頁數 1 •
1
多媒體
評論
新增評論
分享你的心得
Export
取書館
處理中
...
變更密碼
登入