Simulate with complex geometries and complex physics
%ind_tauW%
effective turbulent wall shear stress [N/m^2] in direction of motion
This is the component of the turbulent wall stress vector \( \mathbf{\tau}_W\) in direction of motion relative to the wall
\begin{align} = \mathbf{\tau}^T_W \cdot \frac{ \mathbf{v}_p - \mathbf{v}_\text{boundary} }{ \| \mathbf{v}_p - \mathbf{v}_\text{boundary} \| }\end{align}
See section 1.6 and 1.7 of DOCUMATH_NumericalIntegrationOfTurbulence.pdf
See also KepsilonAlgorithm .