DNS and LES for investigating transition and transition control

H. F. Fasel, H. L. Meitz, C. R. Bachman

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations

Abstract

Applications of Direct Numerical Simulations (DNS) and Large-Eddy Simulations (LES) for investigation of transition and transition control in boundary layers are discussed. An example of DNS is an investigation of the interaction of Klebanoff modes (which can arise from free-stream turbulence) and Tollmien-Schlichting-type instability waves. This simulation shows that the presence of Klebanoff modes significantly modifies die transition process. Results are also presented for investigations of transition control (delay) by wall suction. Various suction configurations (holes, spanwise/streamwise slots, porous wall) were considered and compared with regard to their effectiveness for attenuating primary and secondary instability mechanisms. Finally, results of a LES for a subharmonic-type breakdown transition process are presented and discussed. These results indicate that LES may become a valuable tool for investigating the later stages of the transition process, in particular the initial stages of the random motion.

Original languageEnglish (US)
StatePublished - 1997
Event28th Fluid Dynamics Conference, 1997 - Snowmass Village, United States
Duration: Jun 29 1997Jul 2 1997

Other

Other28th Fluid Dynamics Conference, 1997
Country/TerritoryUnited States
CitySnowmass Village
Period6/29/977/2/97

ASJC Scopus subject areas

  • Engineering(all)

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