Education

Research Description

Dr. Granlund's long term goal is to gain a deeper understanding of separated unsteady, separated flows and develop physics-based low-order force models for maneuvering and control of air vehicles. Unsteady fluid mechanics exist in in several different areas such as helicopter rotor aerodynamics, wind turbines, Micro Air Vehicle flapping flight, high-rate maneuvering conventional aircraft, where the object is unsteady, as well as gusting air with unsteady inflow. In many of these research problems, the freestream has rarely been varied; it is usually assumed to be constant and uniform. Dr. Granlund's research expands the knowledge of how streamwise velocity fluctuations affect "standard" unsteady fluid dynamic problems.

Publications

Leading-edge flow criticality as a governing factor in leading-edge vortex initiation in unsteady airfoil flows

Ramesh, K., Granlund, K., Ol, M. V., Gopalarathnam, A., & Edwards, J. R. (2018), Theoretical and Computational Fluid Dynamics, 32(2), 109–136. https://doi.org/10.1007/s00162-017-0442-0

Experiments and computations on the lift of accelerating flat plates at incidence

Stevens, P. R. R. J., Babinsky, H., Manar, F., Mancini, P., Jones, A. R., Nakata, T., … Ol, M. V. (2017), AIAA Journal, 55(10), 3255–3265.

Non-linearity of apparent mass for multi-element bodies

Granlund K., O. M., & L., B. (2016), AIAA Journal, 54(2), 771–776.

Streamwise oscillation of airfoils into reverse flow

Granlund, K. O., Ol, M. V., & Jones, A. R. (2016), AIAA Journal, 54(5), 1628–1636.

Unsteady aerodynamic characteristics of a translating rigid wing at low Reynolds number

Mancini P., M., F., A. J. A., Granlund, K., & Ol, M. (2015), Physics of Fluids (Woodbury, N.Y.), 27(123102).

Unsteady aerodynamic response of a rapidly started flexible wing

Mancini P., A. J. A., Granlund, K., & Ol, M. (2015), International Journal of Micro Air Vehicles, 7(2), 147–158.

Airfoil longitudinal gust response in separated vs. attached flows

Granlund, K., Monnier, B. O., & Williams, D. (2014), Physics of Fluids (Woodbury, N.Y.), 26(027103).

Discrete-vortex method with novel shedding criterion for unsteady aerofoil flows with intermittent leading-edge vortex shedding

Ramesh, K., Gopalarathnam, A., Granlund, K., Ol, M., & Edwards, J. (2014), Journal of Fluid Mechanics, 751. https://doi.org/10.1017/jfm.2014.297

Effect of root cutout on force coefficients of rotating wings

Schlueter K., J. A., Granlund K., & M., O. (2014), AIAA Journal, 52(6), 1322–1325.

Free-to-pivot flat plates in hover for Reynolds numbers 14 to 21,200

Granlund, K., Ol, M., & Bernal, L. (2014), AIAA Journal, 52(9).

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Grants

Aerodynamic Forces on Slender Body in Supersonic Cavity

Air Force Research Laboratory (AFRL)(7/09/16 - 9/30/19)

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Aerodynamic Forces on Slender Body in Supersonic Cavity

Sponsor: Air Force Research Laboratory (AFRL)

Start Date: 7/09/16

End Date: 9/30/19

Abstract

The purpose of this project is to investigate the magnitude of lift and pitching moment variation during an unsteady vs. the quasi-steady translation of a slender body from a cavity through a vortex-shear layer into supersonic flow. Mean- and time-varying, as well as frequency content of the normal force and pitching moment will be recorded. To correlate the forces on the store, simultaneous flowfield information, as well as surface pressure data will be obtained. The future application is to investigate whether timed-release of stores from cavities offer a benefit in a more accurate prediction of safe trajectory from the air vehicle.

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