Properties🔗
- Van Driest damping function
- Includes additional limiting
- 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: