Statistics of peak overpressure and shock steepness for linear and nonlinear N-wave propagation in a kinematic turbulence

Yuldashev, P.V.; Ollivier, S.; Karzova, M.M.; Khokhlova, V.A.; Blanc-Benon, P.

Авторы: Yuldashev P.V., Ollivier S., Karzova M.M., Khokhlova V.A., Blanc-Benon P.
Журнал: Journal of the Acoustical Society of America
Том: 142
Номер: 6
Год издания: 2017
Издательство: Acoustical Society of America
Местоположение издательства: United States
Первая страница: 3402
Последняя страница: 3415
DOI: 10.1121/1.5015991
Аннотация: Linear and nonlinear propagation of high amplitude acoustic pulses through a turbulent layer in air is investigated using a two-dimensional KZK-type (Khokhlov–Zabolotskaya–Kuznetsov) equation. Initial waves are symmetrical N-waves with shock fronts of finite width. A modified von Karman spectrum model is used to generate random wind velocity fluctuations associated with the turbulence. Physical parameters in simulations correspond to previous laboratory scale experiments where N-waves with 1.4 cm wavelength propagated through a turbulence layer with the outer scale of about 16 cm. Mean value and standard deviation of peak overpressure and shock steepness, as well as cumulative probabilities to observe amplified peak overpressure and shock steepness, are analyzed. Nonlinear propagation effects are shown to enhance pressure level in random foci for moderate initial amplitudes of N-waves thus increasing the probability to observe highly peaked waveforms. Saturation of the pressure level is observed for stronger nonlinear effects. It is shown that in the linear propagation regime, the turbulence mainly leads to the smearing of shock fronts, thus decreasing the probability to observe high values of steepness, whereas nonlinear effects dramatically increase the probability to observe steep shocks.
Добавил в систему: Карзова Мария Михайловна

	ИСТИНА	Войти в систему Регистрация
	ФНКЦ РР
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ФНКЦ РР

Statistics of peak overpressure and shock steepness for linear and nonlinear N-wave propagation in a kinematic turbulenceстатья

Прикрепленные файлы