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Simulation of turbulent separated fl...

Castellucci, Paul.

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Simulation of turbulent separated flows using a novel, evolution-based, eddy-viscosity formulation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Simulation of turbulent separated flows using a novel, evolution-based, eddy-viscosity formulation./
Author:	Castellucci, Paul.
Description:	129 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1103.
Contained By:	Dissertation Abstracts International68-02B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253470

Simulation of turbulent separated flows using a novel, evolution-based, eddy-viscosity formulation.
Castellucci, Paul.

Simulation of turbulent separated flows using a novel, evolution-based, eddy-viscosity formulation. - 129 p.

Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1103.

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

Currently, there exists a lack of confidence in the computational simulation of turbulent separated flows at large Reynolds numbers. The most accurate methods available are too computationally costly to use in engineering applications. Thus, inexpensive models, developed using the Reynolds-averaged Navier-Stokes (RANS) equations, are often extended beyond their applicability. Although these methods will often reproduce integrated quantities within engineering tolerances, such metrics are often insensitive to details within a separated wake, and therefore, poor indicators of simulation fidelity.Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Simulation of turbulent separated flows using a novel, evolution-based, eddy-viscosity formulation.
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035 $a (UMI)AAI3253470
035 $a AAI3253470
040 $a UMI $c UMI
100 1 $a Castellucci, Paul. $3 1917651
245 1 0 $a Simulation of turbulent separated flows using a novel, evolution-based, eddy-viscosity formulation.
300 $a 129 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1103.
500 $a Adviser: Brian Cantwell.
502 $a Thesis (Ph.D.)--Stanford University, 2007.
520 $a Currently, there exists a lack of confidence in the computational simulation of turbulent separated flows at large Reynolds numbers. The most accurate methods available are too computationally costly to use in engineering applications. Thus, inexpensive models, developed using the Reynolds-averaged Navier-Stokes (RANS) equations, are often extended beyond their applicability. Although these methods will often reproduce integrated quantities within engineering tolerances, such metrics are often insensitive to details within a separated wake, and therefore, poor indicators of simulation fidelity.
520 $a Using concepts borrowed from large-eddy simulation (LES), a two-equation RANS model is modified to simulate the turbulent wake behind a circular cylinder. This modification involves the computation of one additional scalar field, adding very little to the overall computational cost. When properly inserted into the baseline RANS model, this modification mimics LES in the separated wake, yet reverts to the unmodified form at the cylinder surface. In this manner, superior predictive capability may be achieved without the additional cost of fine spatial resolution associated with LES near solid boundaries.
520 $a Simulations using modified and baseline RANS models are benchmarked against both LES and experimental data for a circular cylinder wake at Reynolds number 3900. In addition, the computational tool used in this investigation is subject to verification via the Method of Manufactured Solutions. Post-processing of the resultant flow fields includes both mean value and triple-decomposition analysis. These results reveal substantial improvements using the modified system and appear to drive the baseline wake solution toward that of LES, as intended.
590 $a School code: 0212.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0538
690 $a 0759
710 2 0 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 68-02B.
790 1 0 $a Cantwell, Brian, $e advisor
790 $a 0212
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253470