진동하는 2차원 날개 단면 주위에 대한 점성 유동장 계산( Part 2. 동적실속이 발생하는 경우 )

Abstract

Studies of unsteady-airfoil flows have been motivated mostly by efforts to avoid or reduce such undesirable effects as flutter, noise and vibrations, dynamic stall. In this paper, we carry out a computational study of viscous flows around a two-dimensional oscillating airfoil to investigate unsteady effects in these important and challenging flows. A fully implicit incompressible RANS solver has been used for calculating unsteady viscous flows around an airfoil. The cell-centered 2nd order finite volume method is utilized to discretize governing equations. In order to ease the flow computation for fluid region changing in time, improve the quality of solution and simplify the grid generation for an oscillating airfoil flow, the computational method adopts a moving and deforming grid generation technique based on the multi-block grid topology. The numerical method is applied for calculating viscous flows of an oscillating NACA 0012 in uniform flow. The computational results are compared with available experimental data. Computed results are compared with experimental data and flow characteristics of the experiment are reproduced well in the computed results.