ABSTRACT
The present research aims to present the validity, usefulness and applicability of multiphase numerical approach for the simulation and study of the hydrodynamic and salinity intrusion that are usually formed at estuaries, coastal lakes and tidal rivers due to tide effect representing the water surface fluctuations as well as the density current propagation. A two-dimensional multi-phase numerical model for incompressible, immiscible and variable density fluids has been developed based on Navier-Stokes equations. The governing equations were discretized in a collocated grid system and solved with a finite volume method. The present model was parallelized in a shared memory system using Open Multiprocessing (OpenMp), which reduced the computational time. The model was verified against Boussinesq and non-Boussinesq lock exchange problems. In addition, the model was applied to simulate salinity intrusion into Ohashi River that connects Nakaumi and Shinji brackish coastal lakes. The developed model successfully predicted the density current propagation in the experimental cases while it still needs refinement for field study cases.
