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Vortex structures of dynamic pure yaw test using DDES approach and vortex identification method

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Abstract

Considered as the building blocks, vortex structures with variety of sizes and intensity are widely recognized in the viscous flow field around ship. In this paper, the computational fluid dynamics (CFD) solver, naoe-FOAM-SJTU, coupled with delayed detached-eddy simulation (DDES) is adopted to analyze the vortex structures around the benchmark model Yupeng Ship in dynamic pure yaw tests, which are captured by third generation of vortex identification method. The good agreement of the predicted force/moment by DDES method with the experimental data indicates that the present numerical schemes are reliable and robust. Three vortex identification methods, Q-criteria, ΩR and Liutex, are used to capture the vortex structures around the hull. The large separated flow is able to be investigated by these three methods, in which more vortex structures are captured by ΩR approach and Liutex method with scalar, vector and tensor form seems to be more suitable for analyzing the flow mechanism around the hull in dynamic pure yaw test. In general, each vortex structure corresponds to a dominant positive/negative axial Liutex and a bound vortex pair. The streamlines are spiral in the large separated flow, indicating that the flow in corresponding region is rotational. But the rotation of the flow is not directly related to the intensity of Liutex.

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Authors and Affiliations

  1. Computational Marine Hydrodynamics Lab (CMHL), School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Wei-wen Zhao & De-cheng Wan

  2. Wuhan Second Ship Design and Research Institute, Wuhan, 430205, China

    Qing-jie Meng

  3. School of Mathematical Science, Soochow University, Suzhou, 215006, China

    Yi-qian Wang

Authors
  1. Wei-wen Zhao
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  2. Qing-jie Meng
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  3. De-cheng Wan
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  4. Yi-qian Wang
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Corresponding author

Correspondence to De-cheng Wan.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 51909160, 51879159 and 52131102), the National Key Research and Development Program of China (Grant No. 2019YFB1704200).

Biography: Wei-wen Zhao (1990-), Male, Ph. D.

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Zhao, Ww., Meng, Qj., Wan, Dc. et al. Vortex structures of dynamic pure yaw test using DDES approach and vortex identification method. J Hydrodyn 34, 226–233 (2022). https://doi.org/10.1007/s42241-022-0021-8

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  • DOI: https://doi.org/10.1007/s42241-022-0021-8

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