Aerodynamic characteristics of flapping motion in hover

Date

2008-01-01

Author

Kurtuluş, Dilek Funda
FARCY, A.
ALEMDAROGLU, N.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

201
views

0
downloads

The aim of the present work is to understand the aerodynamic phenomena and the vortex topology of an unsteady flapping motion by means of numerical and experimental methods. Instead of the use of real insect/bird wing geometries and kinematics which are highly complex and difficult to imitate by an exact modeling, a simplified model is used in order to understand the unsteady aerodynamics and vortex formation mechanisms during the different phases of the flapping motion. The flow is assumed to be laminar with a Reynolds number of 1,000. Direct numerical simulations, laser sheet visualizations and particle image velocimetry (PIV) measurements are performed for the phenomenological analysis of the flow. The vortex dynamics and their identification are put in evidence with PIV measurements by considering velocity magnitude, streamlines, second invariant of velocity gradient (Q-criteria), vorticity contours and Eurlerian accelerations.

Subject Keywords

General Physics and Astronomy, Mechanics of Materials, Fluid Flow and Transfer Processes, Computational Mechanics

URI

https://hdl.handle.net/11511/41481

Journal

EXPERIMENTS IN FLUIDS

DOI

https://doi.org/10.1007/s00348-007-0369-0

Collections

Department of Aerospace Engineering, Article

Suggestions

OpenMETU
Core

Pressure-velocity coupling algorithm-based pressure reconstruction from PIV for laminar flows Gunaydinoglu, Erkan; Kurtuluş, Dilek Funda (Springer Science and Business Media LLC, 2020-01-01) In this study, we propose a method to reconstruct pressure fields from planar particle image velocimetry measurements for laminar flows by employing semi-implicit method for pressure-linked equations algorithm to solve governing equations where measured velocities are inherently used as boundary conditions. The method starts with interpolating the measured velocity field on a staggered computational grid. The continuity equation, in the form of pressure equation for incompressible flows, is solved with this...
Laser sheet visualization for flapping motion in hover Kurtuluş, Dilek Funda; Farcy, Alain; Alemdaroglu, Nafiz (American Institute of Aeronautics and Astronautics Inc.; 2006-12-01) The aim of the present study is to understand the aerodynamics phenomena and the vortex topology of the highly unsteady flapping motion. Instead of the use of real insect/bird wing geometries and motions which are highly complex and difficult to imitate by an exact modeling, a simplified model is used to understand the unsteady aerodynamics and vortex formation during the different phase of the flapping motion.
Unsteady aerodynamic forces estimation on a square cylinder by TR-PIV Kurtuluş, Dilek Funda; Davıd, L. (Springer Science and Business Media LLC, 2007-02-01) The unsteady aerodynamic forces acting on a square cross-sectional cylinder are investigated by means of time-resolved particle image velocimetry (TR-PIV) at Reynolds number 4,900. The objective of the investigation is to prove the feasibility of non-intrusive force measurements around two-dimensional bodies. The PIV measurements performed at a rate of 1 kHz enable a time resolved (TR) description of the vortex shedding phenomenon occurring at 10 Hz and to follow the time evolution of vortex dominated wake....
Linear stability analysis in compressible, flat-plate boundary-layers Özgen, Serkan (Island Press, 2008-01-01) The stability problem of two-dimensional compressible flat-plate boundary layers is handled using the linear stability theory. The stability equations obtained from three-dimensional compressible Navier-Stokes equations are solved simultaneously with two-dimensional mean flow equations, using an efficient shoot-search technique for adiabatic wall condition. In the analysis, a wide range of Mach numbers extending well into the hypersonic range are considered for the mean flow, whereas both two- and three-dim...
Elliptical Pin Fins as an Alternative to Circular Pin Fins for Gas Turbine Blade Cooling Applications Part 2 Wake Flow Field Measurements and Visualization Using Particle Image Velocimetry Uzol, Oğuz (null; 2001-06-07) Extensive wake flow field measurements and visualizations are conducted using particle image velocimetry (PIV) inside the wakes of the elliptical and circular pin fin arrays in order to better understand the flow physics and the loss mechanisms of these devices. The true-mean velocity field inside the wake two diameters downstream of the pin fin arrays is obtained by collecting and ensemble averaging a large number of PIV samples in the midplane of the test section. Additional experiments are also conducted...

Citation Formats

D. F. Kurtuluş, A. FARCY, and N. ALEMDAROGLU, “Aerodynamic characteristics of flapping motion in hover,” EXPERIMENTS IN FLUIDS, pp. 23–36, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41481.