The flow around laminar airfoils is computed using a Navier-Stokes method coupled to a transition prediction method based on the eN approach. Applying point transition at the predicted transition location produces a strong viscous/inviscid interaction region that prevents the coupled system from converging, whereas the introduction of transitional flow regions resolves that problem. The emphasis is not placed on the development of new transitional flow models but primarily on producing convergence, applying modified, available models. A comprehensive computational study is performed in a strong adverse and zero pressure gradient airfoil flow region, as the transitional lengths differ considerably for the different models. A conventional model, which is applicable in flow regions where transition is predicted well upstream of laminar separation, is proposed, together with a special transitional length model for flows where the boundary layer stays laminar up to separation. The flows over the DoAL3 and the NLF(1)-0416 laminar airfoils are investigated. The coupled Navier-Stokes and eN methods are shown to produce converged results. Furthermore, the values for lift and drag are in excellent agreement with the free transition measurements.
Navier-stokes airfoil computations with e(N) transition prediction including transitional flow regions
Berechnung des Turbulenzeinsatzes bei der Navier-Stokes-Simulation von Tragflügelumströmungen mit der linearen Stabilitätstheorie
AIAA Journal ; 38 , 11 ; 2059-2066
2000
8 Seiten, 10 Bilder, 43 Quellen
Article (Journal)
English
Auftriebsbeiwert , Druckverteilung , laminare Strömung , Navier-Stokes-Gleichung , numerische Strömungsberechnung , stabile Strömung , Stabilitätsgrenze , Strömungszustand , Theorie-Experiment-Vergleich , Tragflügelumströmung , transienter Zustand , turbulente Strömung , Widerstandsbeiwert , Störungstheorie
Navier-Stokes Airfoll Computations with eN Transition Prediction Including Transitional Flow Regions
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