Investigation on transient unsteady cavitation vortex structures and the pressure wave dynamics

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (2) : 22-31.

WANG Zihao1，SUN Tiezhi1，ZHANG Guiyong1,2

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Abstract

The pressure wave mechanism is one of the cavitation flow mechanisms. The generation and propagation of pressure wave is an important source of cavitation instability. In this paper, three-dimensional hydrofoil cavitation flow is studied based on compressible fluid solver and detached-eddy simulation (DES). The results show that the pressure wave is generated by the pressure wave generated by the collapse of the cloud cavity. The propagation process of the pressure wave causes the shorten of the sheet cavity and the high-pressure pulse on the surface of the hydrofoil. The pressure wave is strongly disturb the motion of the vortex. The stable vortex structure on the surface of the hydrofoil is rolled up and replaced by the small-scale vortex structure. The dynamic mode decomposition method is used to analyze the characteristics of the flow field. The first-order mode represents the basic framework and main characteristics of the flow field. The pressure wave effect and the evolution of attached sheet cavity occupy the main energy of the flow field.

Key words

unsteady cavitation / compressibility / vortex structure / pressure wave / dynamic mode decomposition

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WANG Zihao1，SUN Tiezhi1，ZHANG Guiyong1,2. Investigation on transient unsteady cavitation vortex structures and the pressure wave dynamics[J]. Journal of Vibration and Shock, 2024, 43(2): 22-31

References

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