An isolated logarithmic layer

To isolate the multiscale dynamics of logarithmic layer wall-bounded turbulent flows, a novel numerical experiment is conducted in which mean tangential Reynolds stress eliminated except subregion corresponding to typical location channels. Various statistical comparisons against channel flow databases show that, despite some differences, this modified system reproduces kinematics and natural layers well, even absence buffer an outer zone. This supports previous idea that has its own autonomous dynamics. In particular, results suggest velocity gradient wall-parallel scale largest eddies are determined by height tallest momentum-transferring motions, implying very large-scale motions flows not intrinsic part logarithmic-layer Using similar set-up, isolated with constant total stress, representing without driving force, simulated examined.