Abstract
Vortical structures of a submarine with appendages are fully turbulent and complex. Thus, flow control and vortex manipulation are of great importance for the hydrodynamic performance and acoustic characteristics. Take the generic submarine model DARPA Suboff as the test case, a vortex tuning method based on the Liutex force field is proposed to manipulate the vorticity field. Viscous flow past the submarine model in straight-line motion at a Reynolds number of 1.2×107 is achieved by solving the Reynolds averaged Navier-Stokes (RANS) equations. Multi-block structured mesh topology is used to discretize the computational domain, and the shear stress transport (SST) k - ω turbulence model is implemented to close the equations. The control of vortex is achieved by introducing additional source terms based on Liutex vortex definition and identification system to the RANS equations. The resistance acting on the submarine, flow field as well as the vortical structures are compared and analyzed. Results show that Liutex force model can effectively reduce the resistance by 9.31% and change the vortical structures apparently.
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This work was supported by the Oceanic Interdisciplinary Program of Shanghai Jiao Tong University (Grant No. SL2020PT104).
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Projects supported by the National Natural Science Foundation of China (Grant Nos. 52001210, 51879159), the National Key Research and Development Program of China (Grant Nos. 2019YFB1704200, 2019YFC0312400).
Biography: Liu-shuai Cao (1990-), Male, Ph. D., Assistant Professor
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Cao, Ls., Chen, St., Wan, Dc. et al. Vortex tuning of a submarine by Liutex force field model. J Hydrodyn 33, 503–509 (2021). https://doi.org/10.1007/s42241-021-0055-3
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DOI: https://doi.org/10.1007/s42241-021-0055-3