A CFD data-driven aerodynamic model for fast and precise prediction of flapping aerodynamics in various flight velocities

Cai, Xuefei; Kolomenskiy, Dmitry; Nakata, T.; H, Liu

doi:10.1017/jfm.2021.68

Cited by 26 publications

(44 citation statements)

References 71 publications

(168 reference statements)

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“…2016; Cai et al. 2021), but no previous study has combined both tangential viscous forces and a variable virtual mass in a single added-mass model for flapping insect wings (table 1). We combined our added-mass model with a novel generalized Wagner-effect model, which models the Wagner effect as a stroke-acceleration-based reduction in translational-force production.…”

Section: Discussionmentioning

confidence: 99%

“…2016; Cai et al. 2021), but no previous study has combined both tangential viscous forces and a variable virtual mass in a single added-mass model for flapping insect wings (table 1).…”

Section: Discussionmentioning

confidence: 99%

“…2016; Cai et al. 2021). For both cases, the estimated added volume was found to be less than the cylindrical volume assumed according to potential theory ((1.4)–(1.6)).…”

Section: Introductionmentioning

confidence: 99%

“…2016; Cai et al. 2021), but none of these take the Wagner effect into account (table 1). Without a proper Wagner-effect model the description of the aerodynamics of rapidly oscillating insect wings is still incomplete.…”

Section: Introductionmentioning

confidence: 99%

“…2016; Cai et al. 2021), or modelled tangential added-mass forces based on potential-flow theory (Andersen et al. 2005; Berman & Wang 2007).…”

Section: Introductionmentioning

confidence: 99%

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The unsteady aerodynamics of insect wings with rotational stroke accelerations, a systematic numerical study

et al. 2022

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To generate aerodynamic forces required for flight, two-winged insects (Diptera) move their wings back and forth at high wing-beat frequencies. This results in exceptionally high wing-stroke accelerations, and consequently relatively high acceleration-dependent fluid forces. Quasi-steady fluid force models have reasonable success in relating the generated aerodynamic forces to the instantaneous wing motion kinematics. However, existing approaches model the stroke-rate and stroke-acceleration effects independently from each other, which might be too simplified for capturing the complex unsteady aerodynamics of accelerating wings. Here, we use computational-fluid-dynamics simulations to systematically explore how aerodynamic forces and flow dynamics depend on wing-stroke rate, wing-stroke acceleration and wing-planform geometry. Based on this, we developed and calibrated a novel unsteady aerodynamic force model for insect wings with stroke accelerations. This includes improved versions of the translational-force model and the added-mass force model, and we identify a third novel component generated by the interaction of the two. This term reflects the delay in bound-circulation build-up as the wing accelerates. The physical interpretation of this effect is analogous to the Wagner effect experienced by a wing starting from rest. Here, we show that this effect can be modelled in the context of flapping wings as a stroke-acceleration-dependent correction on the translational-force model. Our revised added-mass model includes a viscous force component, which is relatively small but not negligible. We subsequently applied our new model to realistic wing-beat kinematics of hovering Dipteran insects, in a quasi-steady approach. This revealed that stroke-acceleration-related aerodynamic forces contribute substantially to lift and drag production, particularly for high-frequency flapping mosquito wings.

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Section: Discussionmentioning

confidence: 99%

“…2016; Cai et al. 2021), but no previous study has combined both tangential viscous forces and a variable virtual mass in a single added-mass model for flapping insect wings (table 1).…”

Section: Discussionmentioning

confidence: 99%

“…2016; Cai et al. 2021). For both cases, the estimated added volume was found to be less than the cylindrical volume assumed according to potential theory ((1.4)–(1.6)).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…2016; Cai et al. 2021), or modelled tangential added-mass forces based on potential-flow theory (Andersen et al. 2005; Berman & Wang 2007).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations