Influencing Factors and Wavelet Coherence of Waves Generated by Submerged Jet

This paper investigates the significance of various physical factors affecting the wave generated by submerged jet and the synchronization relationship between the wave surface process and different fluid dynamic parameters, based on three-dimensional numerical simulations using a large eddy simulation (LES) model. An orthogonal experimental design was employed, and range analysis and variance analysis revealed that the orifice contraction ratio has the most significant effect on wave height, followed by upstream water depth and orifice elevation. Through wavelet coherence and spectral correlation analysis, the wave surface process was examined in relation to fluid kinetic energy, Reynolds stress, and vortex structure parameters along the jet axis. The results indicate that regions of strong wavelet coherence are concentrated between 0.01 and 1.0 Hz. In the low-frequency range (0.01~1.0 Hz), there are narrow yet continuous coherence bands, while in the slightly higher frequency range (1.0~5.0 Hz), intermittent coherence relationships with wider bands are observed. Additionally, there is a certain degree of correlation between the power spectral density of the wave surface process and these physical quantities, with a maximum spectral correlation coefficient reaching 0.91. This study contributes to a deeper understanding of the factors affecting waves generated by submerged jets, enabling better prediction and control of their effects.