Abstract
3-D Large Eddy Simulation was carried out on plumes advancing over the horizontal surface. The motion of plumes is devided into three groups, immature state, transition state and stable state. The results of this calculation agreed with the experiments of gravity currents by Simpson in stable state. Turbulent heat flux on the interface obtained from Large Eddy Simulation was consistent with 0.01ΔθΔu which is derived from log-linear law by using the experimental results from the previous studies. It was found that there is the two-fold relation between the vertical diffusion coefficient and local Richardson number.
