Density Current Simulations Using Dynamic Connection Scheme of Hydrostatic and Non-Hydrostatic Zone

Abstract

Simulations for several problems about density current were conducted using a new type of ocean model applying a dynamic connection method of hydrostatic zone with non-hydrostatic zone. In the present model, hydrostatic approximation can be applied in the area where both δε and ε² are minute, where δ and ε represent the ratio of grid size Δx to Δz and the ratio of velocity components u to w respectively. The result of simulation for Lock Exchange Problem by present model was corresponded with the result by non-hydrostatic model and experiments. And in simulations for vertical buoyant jet under oscillating current, the diffusion patterns obtained by present model agreed with the result by non-hydrostatic model not only in a vicinity of buoyant jet but also in wide range.