Nukerical anatomy of lock-release gravity current

Gravity currents created by releasing a fixed fluid into a less dense fluid are simulated numerically by using the renormalization group (RNG) κ- model for Reynolds-stress closure and a two-layer function as near wall treatment. A numerical anatomy of the gravity currents is made to characterize the concentration contour, velocity vector diagram, velocity profile, distribution of turbulent kinetic energy, streamlines and entrainment. Computed velocity structure of the current head explains why the front velocity decreases after the current advances about twelve lock lengths.