FEATURES OF THE FLOW STRUCTURE IN A RECTANGULAR TRENCH

The study of features the flow structure in rectangular trenches a wide range Reynolds numbers was carried out by means direct numerical simulation channel and on а plate. Both isothermal non-isothermal formulations problem were considered. Water air used as investigated fluids. inside around trench based length Re<=9000 studied three-dimensional setting. In Re>=10000, unsteady plate with considered two-dimensional formulation problem. Depending number, trench, influence geometric parameters vortices scales their localization intensity analyzed. scale inhomogeneity transverse direction obtained. non-stationary behavior interaction vortex formations each other external at higher are considered, development instability its characteristics shown: from regular oscillations certain frequency to gradual chaosization number increases, when fractional multiple frequencies appear. A comparison made obtained researchers for similar trench. contributions frictional drag shape overall hydraulic well streamlined surface downstream Intensity heat exchange processes maximum values fluxes, dependence transfer oncoming speed evaluated.