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首页> 外文期刊>Journal of aerospace engineering >Reduced-Order Modeling of Three-Dimensional External Aerodynamic Flows
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Reduced-Order Modeling of Three-Dimensional External Aerodynamic Flows

机译：三维外部空气动力流的降阶建模

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摘要

A method is presented to construct computationally efficient reduced-order models (ROMs) of three-dimensional aerodynamic flows around commercial aircraft components. The method is based on the proper orthogonal decomposition (POD) of a set of steady snapshots, which are calculated using an industrial solver based on some Reynolds averaged Navier-Stokes (RANS) equations. The POD-mode amplitudes are calculated by minimizing a residual defined from the Euler equations, even though the snapshots themselves are calculated from viscous equations. This makes the ROM independent of the peculiarities of the solver used to calculate the snapshots. Also, both the POD modes and the residual are calculated using points in the computational mesh that are concentrated in a close vicinity of the aircraft, which constitute a much smaller number than the total number of mesh points. Despite these simplifications, the method provides quite good approximations of the flow variables distributions in the whole computational domain, including the boundary layer attached to the aircraft surface and the wake. Thus, the method is both robust and computationally efficient, which is checked considering the aerodynamic How around a horizontal tail plane, in the transonic range 0.4 ≤ Mach number ≤ 0.8, -3° ≤ angle of attack ≤ 3°.
机译：提出了一种方法来构造围绕商用飞机部件的三维空气动力学流的高效计算降阶模型（ROM）。该方法基于一组稳定快照的适当正交分解（POD），该稳定快照是使用工业求解器根据一些雷诺平均Navier-Stokes（RANS）方程计算得出的。即使快照本身是根据粘性方程式计算得出的，POD模式振幅也可以通过最小化由Euler方程式定义的残差来计算。这使得ROM与用于计算快照的求解器的特性无关。而且，POD模式和残差都使用计算网格中集中在飞机附近的点来计算，这些点构成的数量远小于网格点总数。尽管有这些简化，该方法仍能在整个计算域中提供很好的气流变量分布近似值，包括附接到飞机表面的边界层和尾流。因此，该方法既健壮又计算高效，可以在跨音速范围0.4≤马赫数≤0.8，-3°≤迎角≤3°的情况下考虑水平尾翼周围的空气动力学特性进行检查。

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