Small disturbance navier-stokes computations employing the Wilcox K-omega turbulence model

Alexander Pechloff, Boris Laschka

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations

Abstract

Developed at Technische Universität München, the small disturbance Navier-Stokes method FLM-SD.NS has been substantiated as both an efficient and accurate means for providing unsteady air loads to the transonic aeroelastic analysis process. In an effort to extend its range of applicability, a dynamically linear instance of the Willcox k-ω eddy-viscosity closure is incorporated, complementing the original Spalart- Allmaras option. Harmonic pitching oscillations of a generic high-aspect-ratio wing are investigated. For the attached-flow cases, the k-ω incarnation of FLM-SD.NS delivers equally accurate predictions as the Spalart-Allmaras original. Reductions in computation time, up to half an order of magnitude, in relation to the comparative time-domain Reynolds-averaged Navier- Stokes method FLM-NS are again observed. For the detached-flow case, the primary benefit of the Wilcox k-ω eddy-viscosity closure is witnessed in the FLM-NS-supplied time-invariant mean solution about which FLM-SD.NS computes the dynamically linear perturbation: At localities of flow detachment, the supersonic-flowterminating shock is rendered distinctly closer to the measured physical position than for the Spalart-Allmaras instance. Limitations of the small disturbance approach, however, become apparent for both incarnations, as a substantial degree of nonlinear interaction physically exists.

Original languageEnglish
Title of host publication27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010
Pages1056-1081
Number of pages26
StatePublished - 2010
Event27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010 - Nice, France
Duration: 19 Sep 201024 Sep 2010

Publication series

Name27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010
Volume2

Conference

Conference27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010
Country/TerritoryFrance
CityNice
Period19/09/1024/09/10

Keywords

  • Aeroelasticity
  • Computational fluid dynamics
  • Small disturbance navier-stokes equations

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