Computational Analysis of Flow and Mixing Process Associated with Vortex Generators.

Authors: Stoddard, W., Mihaescu, M, Gutmark, E.
Document Type: Article
Pubstate: Published
Journal: 3rd Int. Conf. on Jets, Wakes and Separated Flows, Sept 27-30, 2010, Cincinnati, Ohio, USA
Year: 2010


Vortex generators (VGs) have been seen to aid in several applications, from mitigating flow separation, to allowing better flow through bent internal ducts, to mixing flows. The flow downstream of VGs can be characterized by high levels of stream-wise vorticity and turbulent kinetic energy (TKE) production. Stream-wise vorticity is produced in the wake of the VGs by the generated longitudinal vortical structures, while large TKE levels are found in the developed shear-layers. The shape of the VGs, their penetration, the distance between two neighboring VGs can modify the flow behavior in the wake of the VGs, and can change the levels of production of both vorticity and TKE. It is possible by changing VG’s geometry to increase vorticity with minimal additional pressure losses or drag. The interaction of the longitudinal vortical structures with each other and with the boundary layer in various configurations is also important to understand since is an important subject for future applications of VGs. In the present computational study, the effect of number and relative placement of VGs on the downstream flow development will be investigated. The induced pressure losses or drag, the stream-wise vorticity production, and turbulent kinetic energy levels will be characterized and compared for different configurations. The wake-solid surface interactions will also be observed.