RANS, URANS, and LES of Coanda wall jet flows

A. Gross, H. F. Fasel

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

3 Scopus citations


Coanda wall jets in technical applications are almost always turbulent. Since reliable prediction tools are not available, wind/water tunnel tests are indispensable for validating any new design. Still, complete confidence in Coanda wall jet applications can only be obtained if the intricate fluid dynamics are understood. Ongoing research efforts, both experimentally and numerically, aim at broadening our understanding of the physical mechanisms involved in Coanda wall jet flows. This paper explores the feasibility of several Reynolds averaged Navier-Stokes (RANS) turbulence models for calculating a Coanda wall jet over a circular cylinder in a quiescent ambient. Neither one of the models captures all aspects of the flow correctly. It is shown how a finite ambient velocity affects both, jet separation location and generated aerodynamic forces. The grid resolution requirements can make direct numerical simulations (DNS) of turbulent Coanda wall jet flows unaffordable. Hybrid turbulence modeling approaches such as detached eddy simulation (DES) and the flow simulation methodology (FSM) combine the advantages of DNS, large eddy simulation (LES), and RANS. The dynamics of the large scale coherent structures are captured while the small scale and more homogeneous turbulence motion is modeled. Using 3-D FSM it is shown how streamwise vortices generated at the nozzle exit can significantly alter the wall jet characteristics.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 36th AIAA Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Number of pages16
ISBN (Print)1563478102, 9781563478109
StatePublished - 2006
Event36th AIAA Fluid Dynamics Confernce - San Francisco, CA, United States
Duration: Jun 5 2006Jun 8 2006

Publication series

NameCollection of Technical Papers - 36th AIAA Fluid Dynamics Conference


Other36th AIAA Fluid Dynamics Confernce
Country/TerritoryUnited States
CitySan Francisco, CA

ASJC Scopus subject areas

  • General Engineering


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