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Low Reynolds number response of a symmetric airfoil to viscous vortical gusts

The response of a NACA0012 airfoil impacted by viscous vortical gusts at low Reynolds numbers is investigated 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 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 U∞. More details on the database and the corresponding simulations can be found in Martínez-Muriel & Flores (2020), Analysis of vortical gust impact on airfoils at low Reynolds number, J. Fluids and Struct, 99.  Contents The database consist on a single ASCII file for each case. After a short, self-explanatory header, each file has 7 columns with the following data:  <ul> <li>time, t U∞/c</li> <li>cl: lift coefficient, cl</li> <li>cd: drag coefficient, cd</li> <li>cm: coefficient of moments with respect to c/4, cm</li> <li>dcl:  perturbation of cl with respect to steady state value, ∆cl </li> <li>dcd:  perturbation of cd with respect to steady state value, ∆cd </li> <li>dcm:  perturbation of cm with respect to steady state value, ∆cm </li> </ul> 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 U∞).  Nomenclature  The names of the files will follow the acronym t_AaYyDdVv.txt, where the lowecase letters are placeholders for:  <table> <tbody> <tr> <td> t </td> <td> Type of vortical gust</td> <td> T: Taylor, LO: Lamb-Oseen</td> </tr> <tr> <td> a </td> <td> Angle of attack </td> <td> α = [+8,0,-8] deg</td> </tr> <tr> <td> y </td> <td> Initial vertical position of the centre of the vortex</td> <td> h/c = [0,0.5,1]</td> </tr> <tr> <td> d </td> <td> Diameter of the core of the vortex </td> <td> D/c = [0.5,1,2]</td> </tr> <tr> <td> v </td> <td> Circumferential velocity </td> <td> v0m/U∞ = [0.1,0.3,1]</td> </tr> </tbody> </table>

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48/100

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These five areas show where the dataset supports — or may limit — practical reuse.

Stewardship: 8
Harmonization: 8
Access: 16
Reuse readiness: 8
Engagement: 8

Topics

Vortical gust response Unsteady aerodynamics Direct Numerical Simulation