Stochastic estimation of cavity shear layer and fully developed turbulent channel flows: linear and non linear multi-time-delay analyses

2014 ◽  
Author(s):  
Davide Lasagna ◽  
Linda Fronges ◽  
Matteo Orazi ◽  
Gaetano Iuso
Keyword(s):  
Time Delay ◽  
Shear Layer ◽  
Channel Flows ◽  
Stochastic Estimation ◽  
Turbulent Channel Flows ◽  
Non Linear

PARTICLE THERMOPHORETIC DEPOSITION IN TURBULENT CHANNEL FLOWS

2001 ◽  
Vol 32 ◽  
pp. 1033-1034
Author(s):  
A. PINELLI ◽  
E. HONTAÑON ◽  
P. GARCIA-YBARRA
Keyword(s):  
Channel Flows ◽  
Turbulent Channel Flows

scholarly journals The effect of droplet coalescence on drag in turbulent channel flows

2021 ◽  
Vol 33 (8) ◽  
pp. 085112
Author(s):  
Ianto Cannon ◽  
Daulet Izbassarov ◽  
Outi Tammisola ◽  
Luca Brandt ◽  
Marco E. Rosti
Keyword(s):  
Channel Flows ◽  
Droplet Coalescence ◽  
Turbulent Channel Flows

scholarly journals Influence of Time Delay on Controlling the Non-Linear Oscillations of a Rotating Blade

Symmetry ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 85
Author(s):  
Yasser Salah Hamed ◽  
Ali Kandil
Keyword(s):  
Time Delay ◽  
Natural Frequency ◽  
Multiple Scales ◽  
Control Process ◽  
Control Force ◽  
Specific Level ◽  
Loop Control ◽  
Positive Displacement ◽  
Non Linear ◽  
Linear Vibrations

Time delay is an obstacle in the way of actively controlling non-linear vibrations. In this paper, a rotating blade’s non-linear oscillations are reduced via a time-delayed non-linear saturation controller (NSC). This controller is excited by a positive displacement signal measured from the sensors on the blade, and its output is the suitable control force applied onto the actuators on the blade driving it to the desired minimum vibratory level. Based on the saturation phenomenon, the blade vibrations can be saturated at a specific level while the rest of the energy is transferred to the controller. This can be done by adjusting the controller natural frequency to be one half of the blade natural frequency. The whole behavior is governed by a system of first-order differential equations gained by the method of multiple scales. Different responses are included to show the influences of time delay on the closed-loop control process. Also, a good agreement can be noticed between the analytical curves and the numerically simulated ones.

scholarly journals Mitigation of turbophoresis in particle-laden turbulent channel flows by using incident electric fields

2019 ◽  
Vol 4 (12) ◽  
Author(s):  
M. Di Renzo ◽  
P. L. Johnson ◽  
M. Bassenne ◽  
L. Villafañe ◽  
J. Urzay
Keyword(s):  
Electric Fields ◽  
Channel Flows ◽  
Turbulent Channel Flows

On the near-wall structures and statistics of fluctuating pressure in compressible turbulent channel flows

2020 ◽  
Vol 32 (11) ◽  
pp. 115121 ◽  
Author(s):  
Jiupeng Tang ◽  
Zhiye Zhao ◽  
Zhen-Hua Wan ◽  
Nan-Sheng Liu
Keyword(s):  
Channel Flows ◽  
Fluctuating Pressure ◽  
Turbulent Channel Flows ◽  
Wall Structures ◽  
Near Wall
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