Abstract
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 condence in Coanda wall jet applications can only be obtained if the intricate uid dynamics are understood. Ongoing research eorts, both experimentally and numerically, aim at broadening our understanding of the physical mechanisms involved in Coanda wall jet o ws. 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 o w correctly. It is shown how a nite ambient velocity aects both, jet separation location and generated aerodynamic forces. The grid resolution requirements can make direct numerical simulations (DNS) of turbulent Coanda wall jet o ws unaordable. Hybrid turbulence modeling approaches such as detached eddy simulation (DES) and the o w 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 signican tly alter the wall jet characteristics.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
