Numerical investigation of forced Coanda wall jets

Stefan Wernz, Hermann F. Fasel

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

5 Scopus citations

Abstract

Forced wall jets over a convex wall (Coanda flows) are being investigated using 3D Navier-Stokes simulations. The focus of our numerical investigations is to study the development and interaction of large coherent structures in the turbulent Coanda flow. These coherent structures, namely large spanwise "rollers" and longitudinal Gortler-type vortices, can greatly influence the development of the Coanda wall jet along the surface of a cylinder and its eventual separation from the cylinder surface. In our numerical simulations of the Coanda flow over a cylinder segment, selective forcing is employed to either enhance or suppress both types of coherent structures. The effect of the selective forcing on the spreading and decay rate of the jet is then studied. It is found that both forcing of the spanwise structures and forcing of the streamwise structures increases the streamwise velocity decay of the wall jet, while only the forcing of spanwise structures significantly enhances the spreading rate.

Original languageEnglish (US)
Title of host publication34th AIAA Fluid Dynamics Conference and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624100314
DOIs
StatePublished - 2004
Event34th AIAA Fluid Dynamics Conference and Exhibit 2004 - Portland, OR, United States
Duration: Jun 28 2004Jul 1 2004

Publication series

Name34th AIAA Fluid Dynamics Conference and Exhibit

Other

Other34th AIAA Fluid Dynamics Conference and Exhibit 2004
CountryUnited States
CityPortland, OR
Period6/28/047/1/04

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Aerospace Engineering

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    Wernz, S., & Fasel, H. F. (2004). Numerical investigation of forced Coanda wall jets. In 34th AIAA Fluid Dynamics Conference and Exhibit (34th AIAA Fluid Dynamics Conference and Exhibit). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2004-2349