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Compressible Turbulent Flows: LES and Embedded Boundary Methods
KTH, School of Computer Science and Communication (CSC), Numerical Analysis, NA. (Numerical Analysis)
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: Universitetsservice US AB , 2009. , xvi, 82 p.
Series
Trita-CSC-A, ISSN 1653-5723 ; 2009:05
Keyword [en]
LES, Embedded Boundary methods, Compressible flow, turbulent flow
National Category
Computational Mathematics Other Physics Topics Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-10090ISBN: 978-91-7415-258-6 (print)OAI: oai:DiVA.org:kth-10090DiVA: diva2:207673
Public defence
2009-04-02, F3, Lindstedtsvägen 26, KTH, 13:15 (English)
Opponent
Supervisors
Note
QC 20100726Available from: 2009-05-05 Created: 2009-03-12 Last updated: 2010-07-26Bibliographically approved
List of papers
1. Pulsed TV holography and schlieren studies, and large eddy simulations of a turbulent jet diffusion flame
Open this publication in new window or tab >>Pulsed TV holography and schlieren studies, and large eddy simulations of a turbulent jet diffusion flame
Show others...
2004 (English)In: Combustion and Flame, ISSN 0010-2180, E-ISSN 1556-2921, Vol. 139, no 1-2, 1-15 p.Article in journal (Refereed) Published
Abstract [en]

In the search for an improved understanding of jet-flame dynamics we here compare predictions from large-eddy simulations (LES) and measurements using schlieren and holographic interferometry of a round turbulent jet diffusion flame. The studies concern a turbulent propane-air (C3H8-O-2/N-2) diffusion flame under ambient conditions at a Reynolds number of Re = 10(4). The interferometric measurements were performed with an all-electronic method, pulsed TV holography, using a pulsed laser and a fast charge coupled device (CCD) camera. The LES calculations use the probability density function (PDF) flamelet approach with a beta function as the probability density function, whereas the subgrid turbulence is modeled with a one-equation eddy viscosity model. In order to validate the LES model quantitative comparisons of first-order statistical moments of the velocity were first made with available data for nonreactive jets. The LES model captures the statistics well. The next step in the validation process concerns comparing the jet-flame development between LES and the schlieren and pulsed TV holography data. To this end the results of the LES calculations were used to simulate instantaneous interference patterns using ray tracing. The LES model describes the overall behavior of the flame successfully.

Keyword
holographic interferometry, schlieren, optical ray tracing, large-eddy simulation, nonpremixed combustion, jet flame, diffusion flame, turbulent combustion
National Category
Computer Science
Identifiers
urn:nbn:se:kth:diva-14217 (URN)10.1016/j.combustflame.2004.06.005 (DOI)000224718400001 ()2-s2.0-4944240995 (Scopus ID)
Note
QC 20100726 QC 20110922Available from: 2010-07-26 Created: 2010-07-26 Last updated: 2017-12-12Bibliographically approved
2. Large eddy simulation of supersonic axisymmetric baseflow
Open this publication in new window or tab >>Large eddy simulation of supersonic axisymmetric baseflow
2003 (English)In: In third international symposium om turbulence and shear flow phenomena(TSFP-3), Sendai Japan 25-27 June 2003., 2003Conference paper, Published paper (Other academic)
National Category
Computer Science
Identifiers
urn:nbn:se:kth:diva-14219 (URN)
Note
QC 20100726Available from: 2010-07-26 Created: 2010-07-26 Last updated: 2010-07-26Bibliographically approved
3. Large Eddy simulation of turbulent non premixed flame
Open this publication in new window or tab >>Large Eddy simulation of turbulent non premixed flame
2003 (English)In: In Third international symposium on turbulence and shear flow phenomena(TSFP-3), Sendai Japan 25-27 June 2003., 2003Conference paper, Published paper (Other academic)
National Category
Computer Science
Identifiers
urn:nbn:se:kth:diva-14220 (URN)
Note
QC 20100726Available from: 2010-07-26 Created: 2010-07-26 Last updated: 2010-07-26Bibliographically approved
4. A Cartesian Embedded Boundary Method for the Compressible Navier-Stokes Equations
Open this publication in new window or tab >>A Cartesian Embedded Boundary Method for the Compressible Navier-Stokes Equations
2009 (English)In: Journal of Scientific Computing, ISSN 0885-7474, E-ISSN 1573-7691, ISSN 0885-7474, Vol. 41, no 1, 94-117 p.Article in journal (Refereed) Published
Abstract [en]

We here generalize the embedded boundary method that was developed for boundary discretizations of the wave equation in second order formulation in Kreiss et al. (SIAM J. Numer. Anal. 40(5):1940-1967, 2002) and for the Euler equations of compressible fluid flow in Sjogreen and Peterson (Commun. Comput. Phys. 2:1199-1219, 2007), to the compressible Navier-Stokes equations. We describe the method and we implement it on a parallel computer. The implementation is tested for accuracy and correctness. The ability of the embedded boundary technique to resolve boundary layers is investigated by computing skin-friction profiles along the surfaces of the embedded objects. The accuracy is assessed by comparing the computed skin-friction profiles with those obtained by a body fitted discretization.

Keyword
Embedded boundary, Compressible fluids, Navier-Stokes equations, Finite difference scheme
National Category
Computer Science
Identifiers
urn:nbn:se:kth:diva-14222 (URN)10.1007/s10915-009-9289-x (DOI)000269533300006 ()2-s2.0-69949109555 (Scopus ID)
Note

QC 20100726

Available from: 2010-07-26 Created: 2010-07-26 Last updated: 2017-12-12Bibliographically approved
5. On the accurancy of an immersed/embedded boundarymethod for compressible turbulent flow
Open this publication in new window or tab >>On the accurancy of an immersed/embedded boundarymethod for compressible turbulent flow
2008 (English)In: ECCOMAS 2008 conference, Venice, 2008Conference paper, Published paper (Other academic)
National Category
Computer Science
Identifiers
urn:nbn:se:kth:diva-14223 (URN)
Note
QC 20100726Available from: 2010-07-26 Created: 2010-07-26 Last updated: 2010-07-26Bibliographically approved
6. LES baseflow simultations using a cartesian embedded Boundary method
Open this publication in new window or tab >>LES baseflow simultations using a cartesian embedded Boundary method
2008 (English)In: ECCOMAS 2008, Venice, 2008Conference paper, Published paper (Other academic)
National Category
Computer Science
Identifiers
urn:nbn:se:kth:diva-14225 (URN)
Note
QC 20100726Available from: 2010-07-26 Created: 2010-07-26 Last updated: 2010-07-26Bibliographically approved

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