DATABASE: Low Reynolds Response To Viscous Vortical Gusts

DATABASE: Low Reynolds Response To Viscous Vortical Gusts

The response of a NACA0012 airfoil impacted by viscous vortical gusts at low Reynolds numbers is investigated by performing Direct Numerical Simulations of the two-dimensional incompressible flow. This database contains the time history of the aerodynamic force coefficients of the airfoil during the interaction with the vortical gust. The airfoil, set at a fixed angle of attack alpha, is impacted by a Taylor/Lamb-Oseen vortical gust, which are characterized by a diameter D, a intensity v0m, and a vertical separation h. Direct Numerical Simulations are run for a range of values for the angle of attack, the size and intensity of the vortical gust, and the vertical separations. All simulations are run at a fixed Reynolds number Re=1000, based on the airfoil chord c and the free-stream velocity Uinf.

More details about this database can be found in: Martínez-Muriel & Flores (2020) Analysis of Vortical Gust Impact on Airfoils at low Reynolds number, J. Fluids Struct. 99, 103138.

Contents

The database consist of a single ASCII file for each case. After a short, self-explanatory header, each file has 7 columns with the following data:

time t Uinf/c
lift coefficient C_l
drag coefficient C_d
coefficient of moments with respect to c/4 C_m
perturbation of C_l with respect to steady state value Delta C_l
perturbation of C_d with respect to steady state value Delta C_d
perturbation of C_m with respect to steady state value Delta C_m
Reference time (t=0) is taken as the time at which the center of the vortical gust reaches the position of the leading edge of the airfoil (if advected at a velocity Uinf).

Nomenclature

t: Type of vortical gust. T:Taylor, LO: Lamb-Oseen
a: Angle of attack alpha=[+8,0,-8] deg
γ: Initial vertical position of the centre of the vortex h/c=
d: Diameter of the core of the vortex D/c=
v: Circumferential velocity v0m/Uinf=

IF YOU USE THIS DATABASE, PLEASE CITE US: Martínez-Muriel & Flores, J. Fluids Struct. 99, 103138 (2020).DOI: 10.1016/j.jfluidstructs.2020.103138