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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 2006

• 1Turbulence, Heat and Mass Transfer 5
Proceeding of The International Symposium on Turbulence, Heat and Mass Transfer - Dubrovnik, Croatia, September 25-29, 2006

806 pages

Volume price - $246.00

Quasi-Unsteady Transition Modelling of Periodic Wakes

D. Kozulovic
Institute of Propulsion Technology, DLR — German Aerospace Center, binder Höhe 1, 51147 Cologne, Germany

T. Rober
Institute of Propulsion Technology, DLR — German Aerospace Center, binder Höhe 1, 51147 Cologne, Germany

ABSTRACT

An approach is presented which models the unsteady effects of wakes in steady simulations. In particular, the laminar and transitional boundary layers of downstream blades are significantly altered by periodically impinging wakes, which are inherently present in turbomachinery flows. In the present approach, the source terms of k-w turbulence model are multiplied by a transition factor, which is a function of the wake Strouhal number. This way the time-mean values of the boundary layer are reproduced in steady simulations. Besides an academic test case, which has been used for calibration of the model, the paper presents a turbine cascade and a 3-stage low pressure turbine. For these test cases the quasi-unsteady approach yields a very good agreement with the measurements at significantly lower computational costs as compared to unsteady simulations. Hence, the method supports a fast and reliable industrial design of turbine airfoils.