The flow around infinite swept wings is computed using a Reynolds-averaged Navier-Stokes method coupled to a boundary layer and a transition prediction method based on the eN approach. This approach applies the two N factor eN strategy, which allows the differentiation between excited Tollmien-Schlichting waves of constant frequency and stationary crossflow waves of constant spanwise wave number. The applicability is documented by comparing computations with infinite swept-wing experiments on four configurations, where one configuration was tested in two different wind tunnels. The limiting N factors for both types of waves are a priori unknown. Hence, firstly the limiting N factors, which represent the stability limit, are deduced from the measured transition locations. Subsequently, iterative computations an executed to determine the transition location using the coupled system, Navier-Stokes, boundary-layer, and two N factor eN method in combination with the stability limit. The correlation between experimentally observed and computed transition locations is shown to be good for all considered wind-tunnel studies.
Infinite swept-wing Navier-Stokes computations with eN transition prediction
Navier-Stokes-Berechnung der Umströmung und des laminar-turbulenten Umschlagspunkts mit der e<sup>N</sup>-Strategie
AIAA Journal ; 43 , 6 ; 1221-1229
2005
9 Seiten, 20 Bilder, 34 Quellen
Aufsatz (Zeitschrift)
Englisch
Grenzschichtströmung , kompressible Strömung , Navier-Stokes-Gleichung , numerische Strömungssimulation , Pfeilflügel , Stabilitätskriterium , Störungstheorie , Strömungszustand , Theorie-Experiment-Vergleich , Tragflügelumströmung , Turbulenz , Welle (Schwingung) , Windkanalprüfung , Zustandsänderung
FLUID DYNAMICS - Infinite Swept-Wing Navier-Stokes Computations with eN Transition Prediction
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