论文标题
三维稳定粘性和可压缩流的通用力理论的数值验证和物理解释
Numerical validation and physical explanation of the universal force theory of three-dimensional steady viscous and compressible flow
论文作者
论文摘要
在最近的一篇论文中,Liu等人。 [``提起并拖动三维稳定的粘性和可压缩流',物理。流体29,116105(2017)]获得了三维稳定流动体上空气动力的通用理论,该理论从不可压缩的一路上有效到超音速度。在该理论中,可以仅在稳定线性远场的单个尾流平面上的涡度分布来确定总空气动力。尽管这一结果至关重要,但尚未对其在实践中的有效性和表现进行研究。在本文中,我们对雷诺(Reynolds)平均的Navier-Stokes模拟了亚音速,跨音速和超音速流,并在三维机翼上进行了模拟。比较了从通用力理论获得的空气动力与从标准壁压积分的空气动力。这两个公式之间的一致性首次证实了该理论在三维稳定粘性和可压缩流中的有效性。通用公式的良好性能主要是由于以下事实:尾流的湍流粘度比其中的分子粘度大得多,这可以显着降低稳定的线性远距离远距离距人体的距离。为了进一步确认理论的正确性,对从分析结果和数值模拟获得的尾流平面上的流结构进行了比较。与该理论普遍性相关的基本物理学是通过确定不同涡度来源来解释的。
In a recent paper, Liu et al. [``Lift and drag in three-dimensional steady viscous and compressible flow'', Phys. Fluids 29, 116105 (2017)] obtained a universal theory for the aerodynamic force on a body in three-dimensional steady flow, effective from incompressible all the way to supersonic regimes. In this theory, the total aerodynamic force can be determined solely with the vorticity distribution on a single wake plane locating in the steady linear far field. Despite the vital importance of this result, its validity and performance in practice has not been investigated yet. In this paper, we performed Reynolds-averaged Navier-Stokes simulations of subsonic, transonic, and supersonic flows over a three-dimensional wing. The aerodynamic forces obtained from the universal force theory are compared with that from the standard wall-stress integrals. The agreement between these two formulas confirms for the first time the validity of the theory in three-dimensional steady viscous and compressible flow. The good performance of the universal formula is mainly due to the fact that the turbulent viscosity in the wake is much larger than the molecular viscosity therein, which can reduce significantly the distance of the steady linear far field from the body. To further confirm the correctness of the theory, comparisons are made for the flow structures on the wake plane obtained from the analytical results and numerical simulations. The underlying physics relevant to the universality of the theory is explained by identifying different sources of vorticity in the wake.