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STATISTICAL MODELING OF VORTEX GENERATORS IN PRESSURE GRADIENT BOUNDARY LAYERS

Florian von Stillfried
Royal Institute of Technology Stockholm Linné Flow Centre Department of Mechanics 100 44 Stockholm, Sweden

Stefan Wallin
Linne FLOW Center, Department of Mechanics Royal institute of technology Osquars Backe 18, Stockholm, Sweden

Arne V. Johansson
Linne FLOW Centre, Dept. of Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

Аннотация

Modeling arrays of passive vortex generators (VGs) pairs, mounted in a flat plate boundary layer with adverse pressure gradient (APG) flow and generating streamwise counter rotating vortex structures is the object of this investigation. Usually, a sound computational fluid dynamics (CFD) investigation requires an adequate grid with a corresponding large number of grid points around such VGs in order to obtain an accurate solution of this flow case. This, in turn, leads to a time-demanding grid generation which often comes along with lots of practical challenges during the creation. An effective way to get around this time-consuming process is to introduce a way to model these flow separation devices statistically and, by that, to add their statistical physical effects to the governing equations rather than resolving their geometries in the computational grid. This approach for the modeling of passive VGs turbulent flow separation devices is presented for APG flow over a flat plate using the CFD code Edge by FOI, the Swedish Defence Research Agency. Moreover, computational results for three dimensional fully resolved VGs as well as experimental results without VGs are evaluated and compared to this statistical VG model approach. It is shown that flow separation can be successfully prevented by means of the statistical VG model.