Numerical study of flow control strategies for a simplified square back ground vehicle

While the potential for the use of synthetic jet actuators to achieve flow control has been noted for some time, most of such flow control studies have been empirical or experimental in nature. Several technical issues must be resolved to achieve rigorous, model-based, closed-loop control methodologies for this class of actuators. The goal of this paper is consequently two-fold. First, we seek to derive and evaluate model order reduction methods based on proper orthogonal decomposition that are suitable for synthetic jet actuators. Second, we seek to derive rigorously stable feedback control laws for the derived reduced order models. The realizability of the control strategies is discussed, and a numerical study of the effectiveness of the reduced order models for two-dimensional flow near the jet exit is summarized.

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A Flow Control Study of a Simplified, Oscillating Truck Cabin Using PANS

Journal of Fluids Engineering ◽

10.1115/1.4040225 ◽

2018 ◽

Vol 140 (12) ◽

Cited By ~ 4

Author(s):

G. Minelli ◽

S. Krajnović ◽

B. Basara

Keyword(s):

Flow Control ◽

Numerical Study ◽

Active Flow Control ◽

Synthetic Jet ◽

Navier Stokes ◽

Dynamic Configuration ◽

Recirculation Bubble ◽

Ground Vehicle ◽

Eddy Simulation ◽

Yaw Angle

This work presents an application of the partially averaged Navier–Stokes (PANS) equations for an external vehicle flow. In particular, the flow around a generic truck cabin is simulated. The PANS method is first validated against experiments and resolved large eddy simulation (LES) on two static cases. As a consequence, PANS is used to study the effect of an active flow control (AFC) on a dynamic oscillating configuration. The oscillation of the model represents a more realistic ground vehicle flow, where gusts (of different natures) define the unsteadiness of the incoming flow. In the numerical study, the model is forced to oscillate with a yaw angle 10 deg > β > –10 deg and a nondimensional frequency St = fW/Uinf = 0.1. The effect of the periodic motion of the model is compared with the quasi-static flow condition. At a later stage, the dynamic configuration is actuated by means of a synthetic jet boundary condition. Overall, the effect of the actuation is beneficial. The actuation of the AFC decreases drag, stabilizes the flow, and reduces the size of the side recirculation bubble.

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Separation flow control on a generic ground vehicle using steady microjet arrays

5th Flow Control Conference ◽

10.2514/6.2010-4701 ◽

2010 ◽

Cited By ~ 1

Author(s):

Sandrine Aubrun ◽

Farrukh Alvi ◽

Azeddine Kourta

Keyword(s):

Flow Control ◽

Separation Flow ◽

Ground Vehicle

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Nonlinear flow control strategies for connection-oriented communication networks

IEE Proceedings - Control Theory and Applications ◽

10.1049/ip-cta:20045247 ◽

2006 ◽

Vol 153 (1) ◽

pp. 21-28 ◽

Cited By ~ 22

Author(s):

A. Bartoszewicz

Keyword(s):

Flow Control ◽

Communication Networks ◽

Control Strategies ◽

Nonlinear Flow

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Numerical study on plasma excitation flow control of Savonius vertical axis wind turbine

Energy ◽

10.1016/j.energy.2021.122133 ◽

2021 ◽

pp. 122133

Author(s):

Wen Xu ◽

Ying Wang ◽

Shen-xian Huang ◽

Cheng-cheng Li

Keyword(s):

Flow Control ◽

Wind Turbine ◽

Numerical Study ◽

Vertical Axis ◽

Vertical Axis Wind Turbine ◽

Plasma Excitation

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Control Strategies for Multistage Solar Collector Systems

Journal of Solar Energy Engineering ◽

10.1115/1.3268262 ◽

1988 ◽

Vol 110 (3) ◽

pp. 230-232

Author(s):

C. Saltiel

Keyword(s):

Comparative Study ◽

Flow Control ◽

Numerical Simulations ◽

Control Strategy ◽

System Performance ◽

Solar Collector ◽

Control Strategies ◽

Climatic Conditions ◽

High Threshold ◽

Threshold Values

A comparative study of the yearly performance of multistage solar collector systems, (comprised of more than one collector type) with a single on/off flow control strategy for all the collectors and separate on/off controls for each collector stage, is performed. Detailed numerical simulations under a range of climatic conditions showed that there is little advantage in using individual collector controls over a single on/off control strategy when the systems operate at low collector thresholds, but differences in system performance can be quite significant at high threshold values. In addition, the choice of the single control strategy (i.e., which collector the strategy is based on) at low thresholds is not critical in terms of system performance.

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