Reduced Order Nonlinear Navier-Stokes Models for Synthetic Jets

2002 ◽  
Vol 124 (2) ◽  
pp. 433-443 ◽  
Author(s):  
Othon K. Rediniotis ◽  
Jeonghwan Ko ◽  
Andrew J. Kurdila
Keyword(s):  
Flow Control ◽  
Numerical Study ◽  
Control Strategies ◽  
Order Reduction ◽  
Synthetic Jet ◽  
Reduced Order Models ◽  
Loop Control ◽  
Reduced Order ◽  
Synthetic Jet Actuators ◽  
Jet Actuators

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.

Reduced Order Nonlinear Navier Stokes Models for Synthetic Jets

1999 ◽  
Author(s):  
Othon K. Rediniotis ◽  
Andrew J. Kurdila
Keyword(s):  
Numerical Study ◽  
Control Strategies ◽  
Order Reduction ◽  
Synthetic Jet ◽  
Reduced Order Models ◽  
Loop Control ◽  
Reduced Order ◽  
Synthetic Jet Actuators ◽  
Jet Actuators ◽  
Reduction Methods

Abstract While the potential for the use of synthetic jet actuators to achieve flow control has been noted fro some tme, most studies of these devices 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 actuator. 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. Secondly, we seek to derive rigorously stable feedback control laws for the derived reduced order models. The readability of the control strategies is discussed, and a numerical study of the effectiveness of the reduced order models are summarized.

Anisothermal Flow Control by Using Reduced-Order Models

2012 ◽  
Author(s):  
Alexandra Tallet ◽  
Cédric Leblond ◽  
Cyrille Allery
Keyword(s):  
Fluid Flow ◽  
Flow Control ◽  
Projection Method ◽  
Control Strategies ◽  
Pollutant Concentration ◽  
Galerkin Projection ◽  
Reduced Order Models ◽  
Reduced Order ◽  
Optimal Projection ◽  
Fluid Flow Control

Despite constantly improving computer capabilities, classical numerical methods (DNS, LES,…) are still out of reach in fluid flow control strategies. To make this problem tractable almost in real-time, reduced-order models are used here. The spatial basis is obtained by POD (Proper Orthogonal Decomposition), which is the most commonly used technique in fluid mechanics. The advantage of the POD basis is its energetic optimality: few modes contain almost the totality of energy. The ROM is achieved with the recent developed optimal projection [1], unlike classical methods which use Galerkin projection. This projection method is based on the minimization of the residual equations in order to have a stabilizing effect. It enables moreover to access pressure field. Here, the projection method is slightly different from [1]: a formulation without the Poisson equation is proposed and developed. Then, the ROM obtained by optimal projection is introduced within an optimal control loop. The flow control strategy is illustrated on an isothermal square lid-driven cavity and an anisothermal square ventilated cavity. The aim is to reach a target temperature (or target pollutant concentration) in the cavity, with an interior initial temperature (or initial pollutant concentration), by adjusting the inlet fluid flow rate.

scholarly journals Correction: Persoons, T.; Cressall, R.; Alimohammadi, S. Validating a Reduced-Order Model for Synthetic Jet Actuators Using CFD and Experimental Data. Actuators 2018, 7, 67

Actuators ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 16
Author(s):  
Tim Persoons ◽  
Rick Cressall ◽  
Sajad Alimohammadi
Keyword(s):  
Experimental Data ◽  
Synthetic Jet ◽  
Reduced Order Model ◽  
Order Model ◽  
Reduced Order ◽  
Synthetic Jet Actuators ◽  
Jet Actuators

The authors wish to make the following corrections to this paper [...]

10703 Study on condition of synthetic jet actuators for flow control around pantograph panhead using CFD analysis

2013 ◽  
Vol 2013.19 (0) ◽  
pp. 99-100
Author(s):  
Yasushi TAKANO ◽  
Takafumi OZAWA ◽  
Takeshi Mitsumodi ◽  
Yuichi SATO ◽  
Mitsuru IKEDA ◽  
...  
Keyword(s):  
Flow Control ◽  
Synthetic Jet ◽  
Cfd Analysis ◽  
Synthetic Jet Actuators ◽  
Jet Actuators

scholarly journals Investigation into clustering of synthetic jet actuators for flow separation control applications

2005 ◽  
Vol 109 (1091) ◽  
pp. 35-44 ◽  
Author(s):  
S. C. Liddle ◽  
N. J. Wood
Keyword(s):  
Boundary Layer ◽  
Flow Control ◽  
Input Signal ◽  
Streamwise Velocity ◽  
Synthetic Jet ◽  
Small Scale ◽  
Signal Phase ◽  
Control Applications ◽  
Synthetic Jet Actuators ◽  
Jet Actuators

Abstract An investigation into the behaviour of clustered synthetic jet Actuators for flow-control applications is described. Experiments have been undertaken with two small-scale synthetic jet actuators in a zero-pressure gradient boundary-layer, in order to investigate the effect of configuration yaw angle and relative input signal phase. Oil-flow visualisation and hotwire anemometry techniques were used, demonstrating that changes in the downstream flow structure could be observed. Compared to a streamwise configuration, in which a symmetrical counter-rotating vortex pair was produced by the synthetic jet-boundary-layer interaction, a broader asymmetric interaction was produced in a 15° yaw configuration. Streamwise velocity contour plots, illustrating the development of the interaction downstream, over four phase angles, were presented. Significant differences in the PSD analyses of downstream streamwise velocity time histories were found, suggesting that input signal phase could influence the stability and hence effectiveness of flow structures used in flow-control applications.

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