首页|Effect of the vortical structures on the hydrodynamic performance of a pitching hydrofoil

Effect of the vortical structures on the hydrodynamic performance of a pitching hydrofoil

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The objective is to study the vortical structural behaviors of a transient pitching hydrofoil and their effects on the hydrodynamic performance.The pitching motion of the hydrofoil is set to pitch up with an almost constant rate from 5° to 15° and then back to 5°,with the Reynolds number 4.4×105 and the frequency 2 Hz.The results show that the main coherent structures around the pitching hydrofoil include small-scale laminar separation bubble(LSB),large-scale second vortex(SV)and trailing edge vortex(TEV)which are all vortical.The relationship between the vortical structure and the lift is investigated with the finite-domain impulse theory.It indicates that the major part of the lift is contributed by the LSB,whereas the shedding and the formation of the SV and TEV cause the fluctuation of the lift.The proper orthogonal decomposition(POD)method is applied to capture the most energetic modes,revealing that the LSB mode occupies a large amount of energy in the flow field.The dynamic mode decomposition(DMD)method accurately extracts the dominant frequency and modal characteristics,with the first mode corresponding to the mean flow,the second mode corresponding to the LSB structure and the third and fourth modes corresponding to the vortex shedding.

Hydrodynamicsvortical structuresfinite-domain impulse theoryproper orthogonal decomposition(POD)dynamic mode decomposition(DMD)Pitching hydrofoil

Rui Yuan、Hui-yun Hao、Qin Wu、Yun-qing Liu、Biao Huang

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School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBeijing Natural Science FoundationFundamental Research Funds for the Central Universities

522790815183900132320332023CX01004

2024

10.1007/s42241-024-0030-x

水动力学研究与进展B辑
中国船舶科学研究中心

水动力学研究与进展B辑

CSTPCDEI
影响因子：0.596
ISSN：1001-6058
年,卷(期)：2024.36(2)