On the structure of turbulent channel flow

摘要: Hot-film measurements of the streamwise velocity component were carried out in a fully developed turbulent water-channel flow for three different Reynolds numbers (13800, 34600 and 48900). The results first four statistical moments complement extend from previous studies channel flow. VITA variance technique waa employed to detect deterministic events velocity. It demonstrated that has band-pass-filter character. number detected was found decrerrae exponentially with threshold level occupy wide range timescales. This makes it impossible define one unique frequency occurrence or duration events. However, by using this information obtained on amplitude timescale distributions chmacteristic features conditional iverages be related skewness flatness factors.