The Turbulence Options tab displays the current settings for various hydrodynamic options such as Horizontal Viscosity, Vertical Viscosity, HMD Cells and the Wave-induced Turbulence. These options are described in the following sub-sections.
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The Turbulent Diffusion tab of the Turbulence Options form is shown in Figure 1. This tab provides the computational options for the horizontal and vertical eddy viscosities and diffusivities. The parameters and options have been grouped according to which dimension they are used for, i.e. horizontal or vertical.
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Figure 1. Turbulence Options: Turbulent Diffusion.
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To ensure that the correct values have been assigned to the correct regions, the AHO and AHD may also be visualized in 2DH View.
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Figure 2. Turbulent Diffusion tab: Setting spatially varying AHO and AHD.
WhenActivate HMD with Smagorinsky with Wall Drag and WC Diffusion is selected (ISHMD=2), then the full HMD is used as well as wall effects. This option also applies diffusivities to all constituent transport, which includes salinity and temperatures. This option should be used when simulating a very uniform flow system, the constituent transport is needed. The resulting horizontal diffusivity from these options can be viewed from within ViewPlan provided velocities are also available. The vertical eddy viscosities and diffusivities (AVO & ABO arrays in EFDC, respectively) can also be viewed if the user configures the Internal Array Viewer (See Appendix A) to include these arrays.
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