A Vertical Jet's Turbulent Characteristics in Wave Environment: Experimental Study

This paper presents experimental results of a turbulent jet vertically discharged into a flow field of regular waves, in the intermediate between deep and shallow water. The instantaneous velocity field of the turbulent jet was measured using the particle image velocimetry (PIV) technique. Phase average method was used to extract the turbulent velocity from the PIV measurements. Four different wave heights were used to show the effects of wave heights on jet. The results Suggest that the influence of wave height oil the turbulent characteristics of jets is significant. The convection term is more sensitive than the turbulent diffusion term for the change of wave heights, and the value of the turbulent diffusion term is about 1/8 similar to 1/3 of the value of the convection term, which shows that the effect of the turbulent diffusion term can't be ignored in time-average N-S equations.