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Improving the efficiency and accuracy of a nonhydrostatic surf zone model
Abstract A previously developed model for simulating breaking surf zone waves is improved to yield more accurate and computationally efficient predictions. The model employs a sigma coordinate transformation in the vertical direction and solves the Reynolds averaged Navier–Stokes equations in a fractional step manner with the pressure split into hydrostatic and nonhydrostatic components. The hydrostatic equations are first solved with an approximate Riemann solver and the velocity field is then corrected to be divergence free by including the nonhydrostatic pressure. The previous model required a cumbersome modification to accurately predict surf zone wave heights. In this paper, a simpler alteration is presented that is shown to also yield accurate surf zone wave height predictions. In addition, other opportunities for improving model accuracy, robustness, and computational efficiency are also investigated including the discretization of advection terms and the selective neglect of potentially insignificant lateral viscous terms in the governing equations.
Highlights ► Simplified the handling of wave breaking in an existing surf zone model. ► Examined the effects of first and second order spatial discretization of the advection terms on overall model accuracy and computational efficiency. ► Investigated the neglect of lateral viscous fluxes in terms of model accuracy, efficiency, and robustness.
Improving the efficiency and accuracy of a nonhydrostatic surf zone model
Abstract A previously developed model for simulating breaking surf zone waves is improved to yield more accurate and computationally efficient predictions. The model employs a sigma coordinate transformation in the vertical direction and solves the Reynolds averaged Navier–Stokes equations in a fractional step manner with the pressure split into hydrostatic and nonhydrostatic components. The hydrostatic equations are first solved with an approximate Riemann solver and the velocity field is then corrected to be divergence free by including the nonhydrostatic pressure. The previous model required a cumbersome modification to accurately predict surf zone wave heights. In this paper, a simpler alteration is presented that is shown to also yield accurate surf zone wave height predictions. In addition, other opportunities for improving model accuracy, robustness, and computational efficiency are also investigated including the discretization of advection terms and the selective neglect of potentially insignificant lateral viscous terms in the governing equations.
Highlights ► Simplified the handling of wave breaking in an existing surf zone model. ► Examined the effects of first and second order spatial discretization of the advection terms on overall model accuracy and computational efficiency. ► Investigated the neglect of lateral viscous fluxes in terms of model accuracy, efficiency, and robustness.
Improving the efficiency and accuracy of a nonhydrostatic surf zone model
Bradford, Scott F. (author)
Coastal Engineering ; 65 ; 1-10
2012-02-08
10 pages
Article (Journal)
Electronic Resource
English
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