動的失速時の翼周辺はく離流と非定常空気力に関する研究 : 第1報,数値解析ーその1

概要

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A numerical scheme is developed for use on two-dimensional time-dependent incompressible turbulent flows of thigh Reynolds number, and applied to the flow over an impulsively started 15% thickness elliptic airfoil at an angle of attack of 30° at a Reynolds number of 5×10^5. The scheme divides the flow field around an airfoil into two regions, the boundary-layer region and its outer flow region. The Reynolds equations with vorticity and stream function as variables are solved in the outer flow domain. The equation of integrated form for the vorticity is solved using a combination of finite differences and grid-free point vortices, while that for the stream function is solved by a similar technique to "Cloud In Cell" method. Results for the problem which involved massive flow separation were compared with experimental data and flow fields and aerodynamic forces acting on the airfoil compared well with mesurements.
1984-12-25