Vortex-Generator Models for Zero- and Adverse-Pressure-Gradient Flows
2012 (English)In: AIAA Journal, ISSN 0001-1452, E-ISSN 1533-385X, Vol. 50, no 4, 855-866 p.Article in journal (Refereed) Published
A computational fluid-dynamics investigation, including passive vortex generators (VGs) that generate streamwise counter-rotating vortex structures, usually requires a grid with fully resolved VG geometries and vortex structures with a corresponding large number of grid points to obtain an accurate solution. An efficient way to avoid such a setup and time-consuming process in turbulent shear-layer flows is to introduce statistics-based vortex-generator modeling. The second-order statistics of the initial vortices are computed by using a vortex model in combination with the lifting-line theory. The statistics are added as additional turbulence stress terms to the equations within a differential Reynolds stress-turbulence model. In this investigation, results from statistical VG model computations for zero- and adverse-pressure-gradient flat-plate boundary-layer flows, as well as for the flow in a plane asymmetric diffuser, are evaluated against results from fully resolved VG computations and experiments. It could be shown that the initial near-field forcing is too weak for the proposed VG model. An improved VG model description removes some drawbacks by adding additional statistical forcing terms. Results become more comparable:, resulting in improved predictions when compared to experiments and fully resolved computations.
Place, publisher, year, edition, pages
2012. Vol. 50, no 4, 855-866 p.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-94047DOI: 10.2514/1.J051169ISI: 000302277000009ScopusID: 2-s2.0-84859321971OAI: oai:DiVA.org:kth-94047DiVA: diva2:525416
FunderSwedish Research Council, 2010-6965Swedish e‐Science Research Center
QC 201205082012-05-082012-05-072013-04-08Bibliographically approved