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Active Control of Separated Flow
2022The performance of many objects is primarily dictated by the flow of surrounding air or water. For example, most of vehicle fuel usage is required to overcome aerodynamic drag. Conversely, the energy in flowing fluids can be harnessed as a renewable energy source.
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Actuators for Active Flow Control
Annual Review of Fluid Mechanics, 2011Actuators are transducers that convert an electrical signal to a desired physical quantity. Active flow control actuators modify a flow by providing an electronically controllable disturbance. The field of active flow control has witnessed explosive growth in the variety of actuators, which is a testament to both the importance and challenges ...
Louis N. Cattafesta, Mark Sheplak
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Active Flow Control of Wing Separated Flow
Volume 1: Fora, Parts A, B, C, and D, 2003Numerical investigations of active flow control, which can offer significant improvements to wind–turbine rotor and turbomachinery performance by suppressing detrimental effects of separated flow, are presented. Simulations of pulsating jet flow control applied on wings at low speed, high Reynolds number turbulent flow and fixed angles of incidence are
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Active Control of Unsteady Cavitating Flows in Turbomachinery
Volume 2A: Turbomachinery, 2019Abstract A preliminary 2D numerical investigation of the active control of unsteady cavitation by means of one single synthetic jet actuator (SJA) is presented. The SJA has been applied to hinder the intrinsic instabilities of a cloud cavitating flow of water around a NACA 0015 hydrofoil with an angle of attack of 8° and ambient ...
de Giorgi M. G. +2 more
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Parameters Defining Active Flow Control
AIAA AVIATION 2021 FORUM, 2021There is a conceptual difference between Boundary Layer Control (BLC) and Active Flow Control (AFC). The former aims to compensate for frictional losses in the boundary layer, while the latter seeks to exploit instabilities in the flow to alter its character. The momentum coefficient Cμ has been the parameter of choice for energizing the boundary layer
Oshima, Emile +3 more
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Development of Piezoelectric Actuators for Active Flow Control
AIAA Journal, 2001The development of piezoelectric actuators for active e ow control is discussed. The type of actuators considered consists of a single sheet of piezoceramic material bonded to the underside of a shim: a “ unimorph” e ap design. Existing theoretical beam models are extended to incorporate a linear strain distribution in the composite unimorph beam ...
Louis N. Cattafesta III +2 more
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Iterative design for active control of fluid flow
2001 European Control Conference (ECC), 2001Iterative controller design for planar Poiseuille flow by model unfalsification and controller redesign is the topic of the paper. The main contribution is to show that model-unfalsification-based iterative design can be useful in flow control problems.
Veres, S.M. +3 more
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Simulation of Active Flow Control on a Stalled Airfoil
Flow, Turbulence and Combustion, 2003zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Spalart, Philippe +3 more
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Multiscale Active Flow Control
2007The physics of the multiscale patterns of flows is introduced in the first part: it is the foundation for analysis of the control of flow. Then a careful distinction is made between control as a passive mean for improving the properties of natural flows relevant to a given application, and control as a robust active tool to optimize a cost function ...
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Semantics of Control-Flow in UML 2.0 Activities
2004 IEEE Symposium on Visual Languages - Human Centric Computing, 2005The recent major revision of the UML has introduced significant changes and additions. In particular, the metamodel portion underlying Activity Diagrams has been completely reengineered, with Activity being the central concept, the successor of ActivityGraph in UML 1.5.
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