摘要
用基于一般曲线坐标系和交错网格的差分法求解原始变量二维不可压粘性流体的N-S方程,计算了宽高比为22.5、两端圆滑的薄平板的气动导数.将薄平板当作刚性物体,首先分别计算物体做竖向强迫振动和扭转强迫振动的气动力,雷诺数取为105,物体运动和气流的耦合作用用动网格法考虑,N-S方程用二阶投影法和多重网格法求解.然后用最小二乘法确定Simiu和Scanlan给出的气动力表达式中的8个气动导数.
Numerical assessment of aerodynamic derivatives of a thin flat plate is conducted by solving two-dimensional initial variable incompressible Navier-Stokes equations in general curvilinear coordinates and staggered mesh with finite difference method. Aerodynamic forces on the heaving or torsional oscillated rigid plate are computed with Reynolds number of 10 5. Vibration of the body is accounted by the moving mesh method. The second-order project method coupled with multigrid technique is used to solve N-S equations. Aerodynamic derivatives in Simiu and Scanlan's formulation of aerodynamic forces are calculated using the least square method. The most aerodynamic derivatives of the thin flat plate obtained with present method agree quite well with both Theodorsen's theoretical results and wind tunnel testing results.
出处
《同济大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
1999年第2期131-135,共5页
Journal of Tongji University:Natural Science
基金
国家自然科学基金
关键词
薄平板
气动导数
动网格法
交错网格
桥梁
Thin flat plate
Aerodynamic derivatives
Moving mesh method
Staggered mesh