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Chinese Science Bulletin, Volume 65, Issue 6: 483-495(2020) https://doi.org/10.1360/TB-2019-0596

Theory and applications of the vortex-surface field

Yue Yang1,2,3,*
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  • ReceivedOct 7, 2019
  • AcceptedNov 18, 2019
  • PublishedJan 2, 2020

Abstract

We review the progress on the theory and applications of the vortex-surface field (VSF). The VSF provides a systematic Lagrangian-based framework for the identification, characterization, and modeling of flow structures. From the theoretical perspective, the vorticity is simplified to a scalar field as the VSF. The VSF isosurface is a vortex surface consisting of vortex lines. By introducing the virtual circulation-preserving velocity, the Helmholtz theorem and the Ertel theorem are extended to some non-ideal flows, so that the VSF evolution equation can be expressed in a Lagrangian conservation form. Thus the VSF isosurfaces of the same threshold at different times have strong coherence, facilitating the tracking of vortex surfaces.

As a general flow diagnostic tool, the numerical VSF solution can be constructed in arbitrary flow fields by solving a pseudo-transport equation driven by the frozen, instantaneous vorticity. In addition, the local optimization method and the boundary-constraint method can further improve the smoothness and convergence of VSF solutions. Then the two-time method is developed for calculating the temporal evolution of VSFs.

From post-processing of large-scale database of numerical simulations, the VSF elucidates mechanisms in the flows with essential vortex dynamics, such as turbulence and transition. For example, the VSF reveals the complex network of tangling vortex tubes in isotropic turbulence, consistent with the vorticity equation and dynamics. In addition, Eulerian vortex-identification criteria cannot identify complete vortex tubes, so the visual “breakdown” of worm-like structures were often reported in the literature. The universal framework of the VSF evolution illustrates an ordered evolution process of coherence structures in transitional flows, in which it is no need to ad hoc change the structure-identification method and isocontour threshold. Moreover, the quantitative VSF study elucidates the interaction between the vortex surface and the shock wave, flame, or electromagnetic field in multi-physics coupled flows.

Based on the characterization of VSFs, we seek robust statistical features, and then determine and model correlations between the features and critical quantities to be predicted in engineering applications. For example, we develop a predictive model of the skin-friction coefficient in boundary-layer transition based on the small-scale inclination angle in experimental images.

Some open problems in the VSF study are discussed, including the regularization for the breakdown of virtual conservation theorems at vorticity nulls and the speedup of the numerical construction and evolution of VSFs.


Funded by

国家自然科学基金(91952108,91841302,11522215)


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  • Figure 1

    (Color online) The sketch of the evolution of a vortex surface along the virtual velocity in a non-ideal flow[12]

  • Figure 2

    (Color online) Isosurfaces of the exact VSF and attached vortex lines for simple flows. (a) (From left to right): Taylor-Green flow, Kida-Pelz flow, vortex ring, and integrable Arnold-Beltrami-Childress flow[19,28]; (b) (from left to right): Trefoil, cinquefoil, and septafoil knotted vortex tubes[29]

  • Figure 3

    (Color online) Visualization of tangling vortex tubes in isotropic turbulence using the VSF isosurface color coded by vorticity magnitude[35]

  • Figure 4

    (Color online) The schematic diagram of different views on the scale cascade of vertical structures in isotropic turbulence. Text on the left describes the visual “breakdown” of structures in the Eulerian view and text on the right describes the continuous evolution of a vortex surface. Break-up and envelop patches denote the isosurfaces of vorticity magnitude and VSF, respectively. Dashed black lines with arrows denote the velocity induced by the vortex lines attached on vortex surfaces[35]

  • Figure 5

    (Color online) Typical structural changes in the transition of channel flow. (a) Generation of hairpin-like structures; (b) reconnection of vortex lines from opposite walls[37]

  • Figure 6

    (Color online) Normal and reverse hairpin-like vortex surfaces (color coded by the wall distance) and lines in pipe transition[50]. (a) Generation of the reverse hairpin vortex; (b) typical vortex lines attached on normal and reverse hairpin-like vortex surfaces in the front view

  • Figure 7

    (Color online) The evolution of the flame and vortex surface (color coded by the vorticity magnitude) in reacting TG flow[55]

  • Figure 8

    (Color online) Image-based modeling of the skin friction coefficient in transition[69]. (a) Obtaining gray-scale images from the experiment of supersonic boundary-layer transition; (b) calculating the inclination angle of small-scale structures after multi-scale decomposition of images; (c) predicting the growth of skin-friction based on the inclination angle

  • Table 1   Typical flow structures identified in K-type transitional wall flows and corresponding geometries of vortex surfaces with their generation mechanisms

    不同流动结构

    涡面几何特征与生成机理

    层流剪切流

    与壁面平行涡面

    Λ形结构

    剪切作用下的壁面法向扰动生成三角形凸起结构

    发卡涡

    三角形凸起结构在流向拉伸和两翼卷并后形成发卡形结构

    条带

    发卡形结构尾部形成的波浪形涡面

    湍斑

    发卡涡与条带结构相互作用引起波浪形涡面的反对称畸变

    转捩后的湍流

    由上述各类机制导致的强变形涡面

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