Abstract
The influence of free surface on the characteristics of turbulence have been investigated experimentally. An oscillating grid was used to generate turbulence in a tank filled with water. The turbulence and the pressure disturbance were measured by both LDV and FLV and the pressure transducer, respectively. The results from the experiments showed that the vertical turbulence was converted into the horizontal one through the pressure fluctuation near the free surface. In addition, it is obvious that there are the dominant eddies contributing to the turbulent characteristics near the free surface as well as the energy exchange due to the pressure redistribution.
