Fig. 1
From: Conditional POD for predicting extreme events in turbulent flow time signals
Quasi-relaminarization events for the MFU at \(Re_c=2000\)Isocontours of normalized Q-criterion, \(Q^{\star }= (\Vert {\varvec{\Omega }}^{\star }\Vert ^2 - \Vert \textbf{S}^{\star }\Vert ^2)/2 =0.2\) with rate-of-rotation tensor \({\varvec{\Omega }}^{\star } = [\nabla ^{\star } \textbf{u}^{\star }- (\nabla ^{\star } \textbf{u}^{\star })^T]/2\) and rate-of-strain tensor \(\mathbf {S^*} = [\nabla ^{\star } \textbf{u}^{\star }+ (\nabla ^{\star } \textbf{u}^{\star })^T]/2\), during a switch of the turbulent wall, with color indicating the streamwise velocity. Time signals of (d) the streamwise velocity and (e) dissipation rate from probes located at a distance of \(y^+ = 10\) from the top and bottom walls.
