Direct TS-Wave Simulation on a Laminar Wing-Profile with Forward-Facing Step

Abstract

Arbeitsgemeinschaft) founded towards the end of the 1970s, whereas DGLR is the German Society for Aeronautics and Astronautics (Deutsche Gesellschaft für Luftund Raumfahrt -Lilienthal Oberth e.V.).The mission of STAB is to foster aerodynamics research and its appreciation in Germany. This is accomplished by creating vivid forums for scientific discussions and by disseminating most recent research results, thereby enhancing scientific progress and avoiding unnecessary duplication in research work. Particularly today, this is more crucial than ever. Thanks to the experience and methodologies gained in the past, it is now easier to obtain new knowledge for solving today's and tomorrow's problems. STAB unites German scientists and engineers from universities, research establishments and the industry, involved in research and project work in the field of numerical and experimental fluid mechanics and aerodynamics for aerospace, ground transportation and other applications. This is a solid basis for numerous common research activities sponsored by different funding agencies.Since 1986, the symposium has taken place at different locations in Germany every two years. In between, STAB workshops have been held regularly at the DLR in Göttingen. The various symposia locations across Germany represent focal points in Germany's Aerospace Fluid Mechanics Community. The STAB symposia and workshops provide excellent forums where new research activities can be presented, often resulting in new jointly organized research and technology projects.It is the eleventh time that the contributions to the symposium are published after being subjected to a peer review. The present contributions highlight the current key area of integrated research and development based on the fruitful collaboration of industry, research establishments and universities. The research areas include v airplane and ground vehicle aerodynamics, multidisciplinary optimization and new configurations, turbulence research and modelling, laminar flow control and transition, rotorcraft aerodynamics, aeroelasticity and structural dynamics, numerical and experimental simulation including test techniques, aeroacoustics as well as biomedical and convective flows.From some 77 lectures presented at the symposium, 67 are included in this book. The review board, partly identical with the programme committee, consisted of: K

Experimental investigation on the effect of forward-facing steps and gaps combined with wall suction on boundary layer transition

“…Later studies (Béguet et al (2016) and Costantini et al (2015)) suggested using local flow p roperties and relative defect dimensions with respect to the local boundary layer thickness instead; however, use of Nenni and Gluyas criteria can still be found today because of its simplicity, a decisive factor of usability in the aerospace industry. Since then, numerous investigations, both experimental (e.g., Klebanoff and Tidstrom (1972), Dovgal et al (1994), Wang and Gaster (2005) or Rius-Vidales and Kotsonis (2020)) and numerical (e.g., Perraud et al (2005), Rizzetta and Visbal (2014) or Lüdeke and Backhaus (2018)) were carried out to further understand the physics involved in the onset of laminar-turbulent transition induced by surface defects. However, the complexity of most numerical models does not currently allow to consider this approach as part of the design process.…”

Experimental investigation on the effect of forward-facing steps and gaps combined with wall suction on boundary layer transition

“…Later studies (Béguet et al (2016) and Costantini et al (2015)) suggested using local flow properties and relative defect dimensions with respect to the local boundary layer thickness instead; however, use of Nenni and Gluyas criteria can still be found today because of its simplicity, a decisive factor of usability in the aerospace industry. Since then, numerous investigations, both experimental (e.g., Klebanoff and Tidstrom (1972), Dovgal et al (1994), Wang and Gaster (2005) or Rius-Vidales and Kotsonis (2020)) and numerical (e.g., Perraud et al (2005), Rizzetta and Visbal (2014) or Lüdeke and Backhaus (2018)) were carried out to further understand the physics involved in the onset of laminar-turbulent transition induced by surface defects. However, the complexity of most numerical models does not currently allow to consider this approach as part of the design process.…”

Direct numerical simulation of TS-waves over suction panel steps from manufacturing tolerances

“…Within different EU-projects, such as Clean Sky I and II, suction through a porous leading edge of a vertical-tail plane (VTP) is investigated by wind tunnel tests and numerical analysis [2,12]. As mentioned, the 2D TS-wave character allows simplified DNS of the flow field using a well-validated high-order numerical approach [13,14] which is used for a detailed simulation of transitional modes in the region of interest.…”

“…To demonstrate sufficient transition suppression by the suction panel with or without welding of the neighbor panel, direct numerical simulations of critical TS-modes are carried out here [14], including post-processing and comparison with growth rates on unperturbed surfaces and stabilization by uniform suction. The strong stabilizing effect of such suction techniques was already calculated by Rist and Zahn [2,15], using DNS and LST approaches.…”