有限体積型TVDスキームを用いたダイナミック・ストール現象の数値解析

概要

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Numerical simulations are performed using the two dimensional compressible Navier-Stokes equations to investigate the dynamic stall phenomena of the NACA 0012 airfoil oscillating near the static stall angle. The airfoil oscillates in pitch about an axis at the 0.25 chord. The Mach number is 0.3. The Reynolds number is 4×10^6. The TVD scheme, which avoids excessive numerical diffusivity, is employed in the discretized convective term. An implicit time discretization is adopted for computational efficiency. Numerical errors caused by using the diagonal matrix method are reduced by Newton iterations at each time step. The effect of the conservation in time on the unsteady grid is investigated. The hysteresis loops of the unsteady lift and pitching moment during dynamic stall are compared with the experimental data of McCroskey-Pucci.
1994-06-25