The open source CFD toolbox
Van Driest

# Properties

• Van Driest damping function
• Applied in the region up to $$y^+$$ of 500

# Model equations

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.

# Usage

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.

# Further information

Source code:

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