Research

COEL's research integrates two state-of-the-art numerical methods, which are the 3D large eddy simulation (LES), and the free-surface resolving two-phase sediment transport model. 

     We are among the first to apply 3D LES to near-field scale nearshore processes. Our LES work unraveled two distinct turbulence generation mechanisms for uprush (bore-driven) and backwash (boundary layer instability) in the swash zone. Furthermore, We revealed the growth and decay of tsunami-induced turbulent coherent structures, e.g., so-called whirlpools observed after the 2004 Indian Ocean and 2011 Tohoku, Japan Tsunamis, where recirculation patterns associated with a local imbalance of turbulence are identified.    

     We also developed an innovative sediment transport model - SedWaveFoam, a solver based on OpenFOAM - for simultaneously resolving free-surface wave propagation, the bottom boundary layer, and sediment transport in a unified multiphase-flow modeling framework. SedWaveFoam has advanced coastal engineering by elucidating physical mechanisms such as nonlinear interactions among boundary layer streaming associated with wave-stirring effect, wave skewness and acceleration skewness corresponding to momentary bed failure driven by near-bed instability as a major driving mechanism for onshore sediment transport.   

     We leverage a range of ongoing domestic and international collaborations to establish a successful research program at PKNU.