Change search
ReferencesLink to record
Permanent link

Direct link
A study of turbulence and scalar mixing in a wall-jet using direct numerical simulation
KTH, School of Engineering Sciences (SCI), Mechanics.
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Direct numerical simulation is used to study the dynamics and mixing in a turbulent plane wall-jet. The investigation is undertaken in order to extend the knowledge base of the influence of the wall on turbulent dynamics and mixing. The mixing statistics produced can also be used to evaluate and develop models for mixing and combustion. In order to perform the simulations, a numerical code was developed. The code employs compact finite difference schemes, of high order, for spatial integration, and a low-storage Runge-Kutta method for the temporal integration. In the simulations performed the inlet based Reynolds and Mach numbers of the wall jet were Re = 2000 and M=0.5, respectively. Above the jet a constant coflow of 10% of the inlet jet velocity was applied. A passive scalar was added at the inlet of the jet, in a non-premixed manner, enabling an investigation of the wall-jet mixing as well as the dynamics. The mean development and the respective self-similarity of the inner and outer shear layers were studied. Comparisons of properties in the shear layers of different character were performed by applying inner and outer scaling. The characteristics of the wall-jet was compared to what has been observed in other canonical shear flows. In the inner part of the jet, 0 ≤ y+ ≤ 13, the wall-jet was found to closely resemble a zero pressure gradient boundary layer. The outer layer was found to resemble a free plane jet. The downstream growth rate of the scalar was approximately equal to that of the streamwise velocity, in terms of the growth rate of the half-width. The scalar fluxes in the streamwise and wall-normal direction were found to be of comparable magnitude.

Place, publisher, year, edition, pages
Stockholm: Mekanik , 2006. , ix, 22 p.
Trita-MEK, ISSN 0348-467X ; 2006:05
Keyword [en]
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-3923ISBN: 91-7178-330-XOAI: diva2:10032
2006-04-28, D3, Huvudbyggnaden, Lindstedtsvägen 5, Stockholm, 10:15
QC 20101108Available from: 2006-04-20 Created: 2006-04-20 Last updated: 2010-11-08Bibliographically approved
List of papers
The record could not be found. The reason may be that the record is no longer available or you may have typed in a wrong id in the address field.
The record could not be found. The reason may be that the record is no longer available or you may have typed in a wrong id in the address field.

Open Access in DiVA

fulltext(2378 kB)1858 downloads
File information
File name FULLTEXT01.pdfFile size 2378 kBChecksum MD5
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Ahlman, Daniel
By organisation
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
Total: 1858 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 694 hits
ReferencesLink to record
Permanent link

Direct link