The flux of vorticity from a piston-cylinder vortex generator is commonly approximated using a model in which the fluid efflux is treated as a uniform slug of fluid with negligible boundary layer thickness. Shusser et al. (2002) introduced a correction to the slug model that accounts for boundary layer growth within the cylinder. We show that their implemented boundary layer solution contains a...

Three vortex-generator configurations were installed aft of the inlet throat on the centerbody of a Mach 3 . 0 mixed-compression inlet. The three were about equal in im­ proving diffuser pressure recovery and all produced significant, although unequal, reduc­ tions in distortion. Only the most densely spaced configuration generated vortices that dissipated before reaching the compressor face. V...

This paper aims at numerically analysing the effect of an active flow control (AFC) by a vortex generator jet (VGJ) submerged in a boundary layer via Chimera Grids and DetachedEddy Simulation (DES). The performance of DES results are judged against Reynolds-Averaged Navier-Stokes (RANS) and compared with the experiments that showed an unsteady vortex motion downstream of VGJ. Experimental resul...

Starting flow through a nozzle or orifice typically results in the transient formation of a leading vortex ring and trailing jet. Experiments are conducted to investigate the dynamics of this process in the case of a temporally variable nozzle exit diameter, with the aim of understanding these flows as they occur in Nature and emerging technologies. By kinematically decoupling the source flow f...

Impact of mixing and chemical change on ozone-tracer relations in the polar vortex R. Müller, S. Tilmes, P. Konopka, J.-U. Grooß, and H.-J. Jost ICG I, Forschungszentrum Jülich, 52425 Jülich, Germany Bay Area Envrionmental Research Institute, Sonoma, CA, USA now at: ACD, NCAR, Boulder, CO, USA Received: 8 June 2005 – Accepted: 6 July 2005 – Published: 10 August 2005 Correspondence to: R. Müller...