Van Driest

- Van Driest damping function
- Includes additional limiting
- Applied in the region up to \( y^+ \) of 500

The Van Driest damping function is given by:

\[ D = 1 - \exp^\frac{-y^+}{A^+} \]

The final length scale is given by:

\[ \Delta = \min \left( \frac{\kappa y}{C_s} D , \Delta_g \right) \]

where \( \Delta_g \) is a geometric-based delta function such as the cube-root volume delta.

The model is specified using:

delta vanDriest; vanDriestCoeffs { delta <geometricDelta>; // Optional entries kappa 0.41; Aplus 26; Cdelta 0.158; calcInterval 1; }

The model requires the near wall distance \(y\) which can be costly to compute for moving mesh cases. Here, the optional `calcInterval`

entry can be used to reduce the update frequency of the wall distance calculation at the expense of increased modelling errors.

Source code:

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