Experimental and numerical investigation of transversal traveling surface waves for drag reduction

Meysonnat, Pascal S.; Roggenkamp, Dorothee; Li, Wenfeng; Roidl, Benedikt; Schröder, Wolfgang

doi:10.1016/j.euromechflu.2015.07.001

Cited by 20 publications

(14 citation statements)

References 31 publications

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“…The numerical method has thoroughly been validated by computing a wide variety of internal and external flow problems [43,3,39,46]. Analyses of drag reduction have been performed for riblet structured surfaces [24] and for traveling transversal surface waves in canonical turbulent boundary layer flow [26,27,28,34] and in turbulent airfoil flow [2]. The quality of the results confirms the validity of the approach for the current flow problem.…”

Section: Methodsmentioning

confidence: 79%

Drag Reduction and Energy Saving by Spanwise Traveling Transversal Surface Waves for Flat Plate Flow

Albers

Meysonnat

Fernex

et al. 2020

Flow Turbulence Combust

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Wall-resolved large-eddy simulations are performed to study the impact of spanwise traveling transversal surface waves in zero-pressure gradient turbulent boundary layer flow. Eighty variations of wavelength, period, and amplitude of the space-and time-dependent sinusoidal wall motion are considered for a boundary layer at a momentum thickness based Reynolds number of Re θ = 1000. The results show a strong decrease of friction drag of up to 26 % and considerable net power saving of up to 10 %. However, the highest net power saving does not occur at the maximum drag reduction. The drag reduction is modeled as a function of the actuation parameters by support vector regression using the LES data. A substantial attenuation of the near-wall turbulence intensity and especially a weakening of the near-wall velocity streaks are observed. Similarities between the current actuation technique and the method of a spanwise oscillating wall without any normal surface deflection are reported. In particular, the generation of a directional spanwise oscillating Stokes layer is found to be related to skin-friction reduction.

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Section: Methodsmentioning

confidence: 79%

Drag Reduction and Energy Saving by Spanwise Traveling Transversal Surface Waves for Flat Plate Flow

Albers

Meysonnat

Fernex

et al. 2020

Flow Turbulence Combust

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“…Figure 3.5f shows an example of the spanwise traveling waves investigated by Tomiyama [3]; most studies involve flat plate and not channel flow. The first study was performed by Itoh and Tamano [26] in 2006, and up to present four different research groups have performed their own studies [3][4][5][6][7][8][26][27][28][29]31,32,82],. Like most other active skin friction reduction techniques involving wall motion, it requires no closed-loop control.…”

Section: Passive and Active Skin Friction Reduction Techniquesmentioning

confidence: 99%

“…Looking at the flow structure Roggenkamp [8] found only minor differences between the TW and unactuated cases. Specifically the streamwise velocity fluctuations and the Reynolds shear stress increased in the logarithmic region (y + > 200) which indicated the displacement of the turbulence off the wall In order to validate the experimental results of Roggenkamp [8], Meysonnat and Roggenkamp [32] conducted a combined experimental and computational study. Roggenkamp's experimental setup [8] and LES were used and the flow conditions between the two were validated by comparing the momentum thickness, boundary layer profiles, and RMS velocity fluctuations.…”

Section: Spanwise Traveling Waves With Wall-normal Motionmentioning

confidence: 99%

“…In addition to the experiments generating spanwise traveling waves on a smooth surface [8,32,82], Li [29] also investigated the combination of spanwise traveling waves and passive riblets. Using the same experimental setup, Li compared the results of the hybrid riblet/TW setup with the results of the traveling wave from Roggenkamp [8].…”

Section: Spanwise Traveling Waves With Wall-normal Motionmentioning

confidence: 99%

“…The use of spanwise (perpendicular to flow) traveling, surface waves as an active drag reduction mechanism has been researched both computationally and experimentally [3][4][5][6][7][8][26][27][28][29][30][31][32]. These studies have investigated the underlying drag reduction mechanism, the dependence on traveling wave parameters, and also varying flow conditions.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

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Turbulent Boundary Layer over a Piezoelectrically Excited Traveling Wave Surface

Musgrave

Tarazaga

2019

AIAA Scitech 2019 Forum

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Skin friction drag plays a significant role in determining the fuel efficiency of a vehicle. Reducing the skin friction thus has implications in a number of applications such as aircraft, ships, and automobiles. In recent years, a large amount of studies have researched various active drag reduction methods. One particular method involves active wall motion with the use of spanwise traveling waves. These out-of-plane traveling waves interact with the vortices in the turbulent boundary layer and weaken the bursting events that are responsible for increased skin friction drag. Computational and experimental studies have shown that these spanwise traveling waves are able to reduce the skin friction by upwards of 13% in turbulent flow. However, previous studies generated traveling waves using bulky actuation setups requiring arrays of discrete actuators that limited the achievable bandwidth and traveling wave patterns. In order for traveling waves to be a practical drag reduction method, a more implementable wave generation method is necessary. A promising traveling wave generation method is known as two-mode excitation. This technique takes advantages of a surface's inherent structural properties to generate steady-state traveling waves in an open-loop fashion. In addition, the waves can be excited at most frequencies and using a small number of low-profile piezoelectric actuators. Previous research into two-mode excitation has primarily focused on one-dimensional beams. Traveling waves have been generated on a two-dimensional surface, but this was done from a fundamental standpoint with the resultant waves propagating in arbitrary directions. Before the two-mode excitation method can be applied for drag reduction, traveling waves must be generated on two-dimensional surfaces with tailorable propagation patterns. The goal of this research is the development and testing of an implementable traveling wave generation method that alters the turbulent boundary layer with the aim of reducing skin friction drag. The first objective is to further develop the two-mode excitation method in order to tailor the traveling waves generated on a two-dimensional plate. Then, these tailored traveling waves are experimentally tested to determine their effect on the turbulent boundary layer. By directly investigating the boundary layer, a more fundamental approach is taken than only focusing on the skin friction drag. Finally, the overall effect of the traveling waves on the boundary layer are compared with standing waves. vii None of this would have been possible without the support of my family. My parents, Robert and Jacqueline, you raised me to be the person I am today. You have always been there with support and encouragement, and I am eternally grateful. I want to thank my brothers, Brian and Robert, and their wives, Katie and Lindsay. You are always there to chat and you provided many late nights of fun. Finally, I want to thank Alexis Gushiken and the endless support she has given. You always know when to motivate, encourage, o...

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Drag Reduction of Transversal Surface Waves with Sweep Angle

Meysonnat

Albers

Schröder

2019

Proc Appl Math and Mech

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Experimental and numerical investigation of transversal traveling surface waves for drag reduction

Cited by 20 publications

References 31 publications

Drag Reduction and Energy Saving by Spanwise Traveling Transversal Surface Waves for Flat Plate Flow

Drag Reduction and Energy Saving by Spanwise Traveling Transversal Surface Waves for Flat Plate Flow

Turbulent Boundary Layer over a Piezoelectrically Excited Traveling Wave Surface

Drag Reduction of Transversal Surface Waves with Sweep Angle

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