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首页> 外文期刊>Journal of the American Helicopter Society >Investigation of Hybrid Grid-Based Computational Fluid Dynamics Methods for Rotorcraft Flow Analysis
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Investigation of Hybrid Grid-Based Computational Fluid Dynamics Methods for Rotorcraft Flow Analysis

机译：基于混合网格的旋翼飞行器计算流体动力学方法研究

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摘要

Accurate flow prediction is essential to the development of rotorcraft, and whereas current analysis tools can, in principle, model the complete flow field, in practice their accuracy is hampered by various inherent numerical deficiencies. For example, grid-based computational fluid dynamics (CFD) methods introduce nonphysical dissipation that can quickly smear regions of vorticity leading to poor performance predictions. Recently, it has been shown that numerical diffusion can be controlled in a grid-based solver, based on a vorticity-velocity rather than pressure-velocity formulation. Using such techniques, a CFD module, VorTran-M, has been developed that solves the vorticity-velocity formulation of the Navier-Stokes equations. This paper describes the coupling of VorTran-M to the OVERFLOW Reynolds-averaged Navier-Stokes solver, and results presented clearly indicate that the hybrid analysis offers the potential for improved performance predictions, reduced cellode counts, and more straightforward setup by eliminating the need for custom flight condition dependent grids and boundary conditions.
机译：准确的流量预测对于旋翼飞机的发展至关重要，尽管目前的分析工具原则上可以对整个流场进行建模，但实际上，其准确性会受到各种固有数值缺陷的影响。例如，基于网格的计算流体动力学（CFD）方法引入了非物理耗散，这些耗散会迅速涂抹涡流区域，从而导致性能预测不佳。近来，已经显示出可以基于涡度-速度而不是压力-速度公式在基于网格的求解器中控制数值扩散。使用这种技术，已经开发出CFD模块VorTran-M，它可以解决Navier-Stokes方程的涡度-速度公式。本文介绍了VorTran-M与OVERFLOW Reynolds平均Navier-Stokes求解器的耦合，并且给出的结果清楚地表明，混合分析为消除性能障碍提供了改进性能预测，减少单元/节点数量以及更直接设置的潜力。需要定制飞行条件相关的网格和边界条件。

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