Abstract
A three-dimensional numerical model has been developed using large eddy simulation, to simulate the motion of axisymmetric gravity currents, which are generated by direct dumping of sediments into quiescent water. The model governing equations are three-dimensional, incompressible Navier-Stokes equations and mass transport equation. The solution technique employs operator-splitting algorithm to split governing equations into three parts, namely, advection part, diffusion part, and pressure part. The advection part is solved by the Quadratic Upstream Interpolation for Convective Kinematics with Estimated Streaming Terms using Universal Limiter (ULTIMATE QUICKEST) scheme. The Compact Finite Difference (CFD) scheme is used to solve diffusion part and the Successive Over-Relation (SOR) method is employed for pressure part. The modified Smagorinsky model, which includes a buoyancy term, is used for turbulence closure. The flow characteristics of the experimental axisymmetric gravity current, including intrusion distance, front height, front velocity, and the amount of deposited particles obtained from experiment are found to be in agreement with the simulations.
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