# 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