This paper presents computational fluid dynamics (CFD) results of the transitional flow field around a transonic transport aircraft wing. The framework for the analyses is formed by the german LuFo VI-1 project CATeW (Coupled Aerodynamic Technologies for Aircraft Wings), where benefits of the technology coupling between a hybrid laminar flow control (HLFC) system and a variable camber (VC) wing on aerodynamic drag is assessed. The computational fluid dynamics framework for the modelling of both technologies is presented in the paper, followed by CFD results considering a variation in both suction strength and deflection angle of an Adaptive Dropped Hinge Flap (ADHF), the latter integrating the VC capability to the aircraft wing. Transition prediction is performed following two strategies; on the one hand, the γ −Reθ +CF turbulence model is applied, predicting an overall drag reduction with suitable suction and deflection angle settings reflecting the downstream shift of the transition location with increasing suction strength. On the other hand, linear stability theory with a two-N-factor integration strategy for transition prediction is applied. This allows for a quantitative assessment of targeted synergy effects between the coupled HLFC and VC application, namely suppression of Tollmien-Schlichting instabilities through a favorable adaptation of the wing’s surface pressure distribution downstream of the HLFC suction panel. A reduction in N-factors is reflected for adapted deflection angles of the ADHF, indicating the synergy potential of the presented HLFC-VC coupling. As a last step, predicted transition location of both methods are compared, showing accordance in predicting transition in direct vicinity of the wing’s leading edge for large sections of the wing’s span for the no suction case. Generally, the transition location of the two-N- factor method lies upstream with respect to the location of the γ − Reθ + CF model. Differences arise in the outboard section of the wing’s suction side, where the two-N-factor method predicts a change in transition mechanism to critical amplification of Tollmien-Schlichting waves for the chosen critical N-factors.    «

This paper presents computational fluid dynamics (CFD) results of the transitional flow field around a transonic transport aircraft wing. The framework for the analyses is formed by the german LuFo VI-1 project CATeW (Coupled Aerodynamic Technologies for Aircraft Wings), where benefits of the technology coupling between a hybrid laminar flow control (HLFC) system and a variable camber (VC) wing on aerodynamic drag is assessed. The computational fluid dynamics framework for the modelling of b...    »

The funding of the presented investigations within the LuFo VI-1 project CATeW (Coupled Aerody- namic Technologies for Aircraft Wings, FKZ: 20E1917B) by the German Federal Ministry for Eco- nomic Affairs and Climate Action (BMWK) is gratefully acknowledged. Furthermore, the authors deeply appreciate the German Aerospace Center (DLR) for providing the DLR TAU Code used for the numerical HiFi - investigations. Moreover, the authors would like to thank the Gauss Centre for Supercomputing e.V. (www.gauss-centre.eu) for providing computing time on the GCS Super- computer SuperMUC-NG at Leibniz Supercomputing Center (LRZ, www.lrz.de).    «

The funding of the presented investigations within the LuFo VI-1 project CATeW (Coupled Aerody- namic Technologies for Aircraft Wings, FKZ: 20E1917B) by the German Federal Ministry for Eco- nomic Affairs and Climate Action (BMWK) is gratefully acknowledged. Furthermore, the authors deeply appreciate the German Aerospace Center (DLR) for providing the DLR TAU Code used for the numerical HiFi - investigations. Moreover, the authors would like to thank the Gauss Centre for Supercomputing e.V....    »

The authors confirm that they, and/or their company or organization, hold copyright on all of the original material included in this paper. The authors also confirm that they have obtained permission, from the copyright holder of any third party material included in this paper, to publish it as part of their paper. The authors confirm that they give permission, or have obtained permission from the copyright holder of this paper, for the publication and distribution of this paper as part of the ICAS proceedings or as individual off-prints from the proceedings.    «

The authors confirm that they, and/or their company or organization, hold copyright on all of the original material included in this paper. The authors also confirm that they have obtained permission, from the copyright holder of any third party material included in this paper, to publish it as part of their paper. The authors confirm that they give permission, or have obtained permission from the copyright holder of this paper, for the publication and distribution of this paper as part of t...    »