Numerical Analysis of Internal Hydraulic Jump in Complex Topography
Abstract
Topographic effects on internal hydraulic jumps in stratified flow over complex geometry are studied. The simulations are motivated by flow conditions present in a channel in Hood Canal, Washington with continuous density profiles and constant inlet velocities.
Results show that mixing in the domain is typically increased by topographic variation, where isolated expansions saw an increase in mixing, but the associated velocity decrease in expansions had contrasting effects on mixing. Likewise, a contraction with an increased velocity caused more mixing, seeing geometry change and velocity acting as compounding factors. 2D results including along channel topographic variation modelled after Hood Canal's topography and density profiles differed from observational results because channel width variation was excluded, but mixing was affected by the direction of the flow over the topography, and the density profile. Given these results, future work into more realistic 3D simulations is encouraged.