1-DV RANS MODELLING OF UNSTEADY BOUNDARY LAYERS

Boundary layers developing under gradually varied unsteady flows such as tsunamis, tidal flows, and flood waves propagating in estuaries have particular importance for application in coastal and hydraulic engineering, such as scour, bank/scour protection, structural design, flood inundation, and sediment transport. Many studies have been conducted involving both physical modelling (Sumer et al., 2010; KohandelGargari et al., 2021) and numerical modelling (Williamsand Fuhrman, 2016) to study the flow dynamics and turbulence in such boundary layers. Boundary layers associated with gradually-varied involve rising and falling stages, and therefore exhibit a distinct unsteady character. This paper presents the early results of a 1-DV numerical modeling study, with which the boundary layers developing under different unsteady flows were investigated.