Within the framework of the threedimensional boundary layer, the developed turbulent flow region of the uncompressible liquid is modeled under the influence of the longitudinal unfavorable (positive) pressure gradient in the diffuser. For turbulent flow mode the averaged by Reynolds boundary layer equations are closed using the differential turbulence model based on the turbulent viscosity introduction and the KolmogorovPrandtl hypotheses. The experiments results are analyzed, the correlation dependencies for the different initial data are received. The obtained calculations are compared with experimental results. Based on the numerical solutions of turbulent boundary layer equations, the mechanisms of flows interaction are studied under the transverse pressure gradients in the uncompressible liquid .
Моделирование трехмерного течения несжимаемой жидкости в турбулентном пограничном слое диффузора
В рамках трехмерного пограничного слоя моделируется область развитого турбулентного течения несжимаемой жидкости в условиях воздействия продольного неблагоприятного (положительного) градиента давления (далее НГД) в диффузоре. Для турбулентного режима течения осредненные по Рейнольдсу уравнения пограничного слоя замыкаются с использованием дифференциальной модели турбулентности, основанной на введении турбулентной вязкости и гипотез Колмогорова–Прандтля. Проанализированы результаты эксперимента, получены корреляционные зависимости для различных исходных данных. Полученные расчеты сопоставляются с экспериментальными результатами. На основе численных решений уравнений турбулентного пограничного слоя изучаются механизмы взаимодействия потоков при наличии поперечных градиентов давления в несжимаемой жидкости.
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