2002 年 2002 巻 238 号 p. 238_55-238_61
Measurements of the velocity-pressure correlations, double- and triple-velocity correlations called the pressure-diffusion, Reynolds stress and the turbulent transport, respectively, in the self-preserving circular turbulent jet were carried out in the water tank in order to evaluate the magnitude and the structure of the turbulent diffusion terms. The velocity and the pressure in the jet were simultaneously measured by an X-type hot film sensor and a pressure transducer with a fine static pressure tube respectively. Measured data show that the structure of the turbulent transport in the circular turbulent jet is similar to the structure modeled by differentiating the Reynolds stress called the gradient diffusion model when the pressure-diffusion is unrelated, however, the structure of the pressure-diffusion and the turbulent transport are different from the gradient diffusion model when these terms should be modeled together. The problems and possibility of the modeling of the pressure-diffusion term are discussed using measured data.
