Assessment of computational techniques for the prediction of acoustic sources from lifting surfaces using LES and DNS

Tom A. Smith, Yiannis Ventikos

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

4 Citations (Scopus)

Abstract

The acoustic field produced by the flow over a lifting surface is closely linked to the dynamics of the boundary layer. The location and mechanism of the transition strongly influences the character of the trailing edge flow and surface pressure fluctuations and so accurately predicting the transition process is critical for acoustic analyses. In this study, a comparison of DNS and LES is undertaken for a transitional boundary layer flow over a foil at a moderate Reynolds number. The effects of the of sub-filter scale model, discretisation scheme and mesh resolution are considered to better understand how LES can be used to accurately resolve external boundary layer and trailing edge flows. Significant differences are seen for the different modelling approaches and the reasons for this are explored. A second case is then considered using LES which has a very different boundary layer and trailing edge flow. This case highlights the important link between the transitional boundary layer dynamics, trailing edge flow and the acoustic field.

Original languageEnglish
Title of host publication8th International Conference on Computational Methods in Marine Engineering, MARINE 2019
EditorsRickard Bensow, Jonas Ringsberg
PublisherInternational Center for Numerical Methods in Engineering (CIMNE)
Pages393-404
Number of pages12
ISBN (Electronic)9788494919435
Publication statusPublished - 2019
Externally publishedYes
EventInternational Conference on Computational Methods in Marine Engineering (MARINE) 2019 - Gothenburg, Sweden
Duration: 13 May 201915 May 2019
Conference number: 8th
https://congress.cimne.com/marine2019/frontal/default.asp (Website)

Conference

ConferenceInternational Conference on Computational Methods in Marine Engineering (MARINE) 2019
Abbreviated titleMARINE 2019
Country/TerritorySweden
CityGothenburg
Period13/05/1915/05/19
Internet address

Keywords

  • Boundary layer transition
  • DNS
  • LES
  • Trailing edge flow

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