Инд. авторы:	Деменков А.Г., Черных Г.Г.
Заглавие:	Математическое моделирование турбулентных следов с варьируемым суммарным избыточным импульсом
Библ. ссылка:	Деменков А.Г., Черных Г.Г. Математическое моделирование турбулентных следов с варьируемым суммарным избыточным импульсом // Вычислительные технологии. - 2015. - Т.20. - № 4. - С.29-44. - ISSN 1560-7534. - EISSN 2313-691X.
Внешние системы:	РИНЦ: 24339604;
Реферат:	eng: The turbulent wakes behind towed and self-propelled bodies in homogeneous fluid are an obvious example of jet turbulent flows with a varied value of total excess momentum. The turbulent wakes are also characterized by a considerably varying ratio Ρ/ε, where Ρ is the generation of turbulence energy due to gradients of the averaged motion, and ε is the rate of dissipation of the turbulence energy to heat. In momentumless turbulent wakes even on distances of about ten diameters of the body this ratio is rather small. In drag turbulent wakes behind slender axisymmetric bodies the ratio Ρ/ε is close to unity. In present paper we consider flows in some turbulent wakes with varied total excess momentum. For description of the flow in turbulent wakes we use the system of averaged equations of motion in thin shear viscous layer approach. This system is not closed. Based on non-equilibrium Rodi’s algebraic stress model, the numerical model for turbulent wakes has been constructed. Sufficient universality of the applied algebraic model is caused by the possibility of considering the influence of the parameter Ρ/ε. The results of calculations are in a good agreement with known experimental data. Based on the modified mathematical model which takes into account the substantial variation of the Reynolds turbulent number in the process of turbulent flow decay, the numerical simulation of the final stage degeneration for axisymmetic wakes with zero and small nonzero total excess momentum was carried out. rus: С применением модифицированной e ∼ ε-модели турбулентности выполнено численное моделирование динамики плоских и осесимметричных турбулентных следов с варьируемым суммарным избыточным импульсом в однородной жидко-сти. Результаты расчетов хорошо согласуются с известными экспериментальными данными. Осуществлено численное моделирование асимптотического вырождения осесимметричных турбулентных следов с нулевым и малым ненулевым суммарным избыточным импульсом.
Ключевые слова:	numerical modelling; plane and axisymmetric turbulent wakes vith varied total excess momentum; асимптотическое вырождение осесимметричных турбулентных следов; численное моделирование; плоские и осесимметричные турбулентные следы с варьиру-емым суммарным избыточным импульсом; asymptotic degeneration of axysimmetric turbulent wakes;
Издано:	2015
Физ. характеристика:	с.29-44
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