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Guest Chris Nielsen

Scalar diffusivity

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Guest Chris Nielsen

The horizontal-mixing scalar diffusivity can be defined as a constant value or can be calculated using the Smagorinsky or Elder models.  The Elder model calculates an an-isotropic diffusivity tensor with principal axes aligned with the flow direction and which scales on the local friction velocity.  The Elder model allows the user to specify higher mixing in the longitudinal flow direction than transverse to the flow.

 

The vertical-mixing scalar diffusivity can be defined as a constant value or can be calculated using a parametric model.  The parametric model is based on a parabolic eddy-viscosity profile and applies the Munk & Anderson limiters in the case of stable stratification.

 

Upper and lower bound values can be specified for the horizontal and vertical scalar diffusivities.

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