Abstract
A cool water jet is discharged horizontally into a water vessel with thermal stratification, in order to examine the effect of thermal stratification on the behavior of cool jet diffusion.
The discharged cool jet sinks gradually by a negative buoyancy near the discharging nozzle. The cool jet is warmed by the effect of thermal stratification and then its negative buoyancy is weakened. It is found that the flow of the cool jet behaves as an overshoot due to inertia and then its flow direction turns upwards. The rebounded flow raises the equivalent density depth. The flow streams horizontally and keeps its depth clearly by the effect of thermal stratification. It is clarified that thermal stratification affects the behavior of a cool jet.
Large eddy simulations(LES)using a non-isotropic Dynamic Smagorinsky model is performed and its numerical result is compared with the experimental results. The numerical result corresponds to experimental ones accurately in terms of velocities and the depth of the jet axis. It is confirmed that this model is available for simulation of the behavior of a cool jet into thermal stratification.
