Academic literature on the topic 'Control flow separation'

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Journal articles on the topic "Control flow separation"

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Lu, Weiyu, Guoping Huang, Jinchun Wang, and Yuxuan Yang. "Interpretation of Four Unique Phenomena and the Mechanism in Unsteady Flow Separation Controls." Energies 12, no. 4 (2019): 587. http://dx.doi.org/10.3390/en12040587.

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Unsteady flow separation controls are effective in suppressing flow separations. However, the unique phenomena in unsteady separation control, including frequency-dependent, threshold, location-dependent, and lock-on effects, are not fully understood. Furthermore, the mechanism of the effectiveness that lies in unsteady flow controls remains unclear. Thus, this study aims to interpret further the unique phenomena and mechanism in unsteady flow separation controls. First, numerical simulation and some experimental results of a separated curved diffuser using pulsed jet flow control are discusse
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HASEGAWA, Hiroaki, Yukihiro SAWADA, and Kazuo MATSUUCHI. "ACTIVE SEPARATION CONTROL USING VORTEX GENERATOR JETS WITH TRIANGULAR ORIFICES(Flow Control 1)." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 363–68. http://dx.doi.org/10.1299/jsmeicjwsf.2005.363.

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Gad-el-Hak, Mohamed, and Dennis M. Bushnell. "Separation Control: Review." Journal of Fluids Engineering 113, no. 1 (1991): 5–30. http://dx.doi.org/10.1115/1.2926497.

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Under certain conditions, wall-bounded flows separate. To improve the performance of natural or man-made flow systems, it may be beneficial to delay or advance this detachment process. The present article reviews the status and outlook of separation control for both steady and unsteady flows. Both passive and active techniques to prevent or to provoke flow detachment are considered and suggestions are made for further research.
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Arifuzzaman, Md. "Flow Separation Control on Flapped Airfoil." IOSR Journal of Engineering 02, no. 07 (2012): 137–40. http://dx.doi.org/10.9790/3021-0271137140.

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Vaisakh, S., and TM Muruganandam. "Influence of multi-wall separation control on normal-shock-induced separation in supersonic duct flows." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 9 (2018): 3184–92. http://dx.doi.org/10.1177/0954410018793789.

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In this work, separation due to the interaction of normal shock with wall boundary layers in a supersonic duct flow is studied using schlieren, oil flow visualization, and pressure measurements. This study uses separation control devices on three walls of a rectangular duct and investigates the influence of adding control on one wall and on the other walls. It was found that control on any wall has effect on separation on other walls. This effect was found to be due to the change in the size of corner separations. Pressure recovery was found to be steeper with the introduction of more control
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Segawa, Takehiko, Daiki Suzuki, Takayasu Fujino, Timothy Jukes, and Takayuki Matsunuma. "Feedback Control of Flow Separation Using Plasma Actuator and FBG Sensor." International Journal of Aerospace Engineering 2016 (2016): 1–16. http://dx.doi.org/10.1155/2016/8648919.

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A feedback control system for mitigating flow separation was developed by using a string-type dielectric-barrier-discharge (DBD) plasma actuator and a fiber Bragg grating (FBG) sensor. Tangential jets were induced from the string-type DBD plasma actuator, which was located at 5% chord from the leading edge of an NACA0024 airfoil. The FBG sensor was attached to the interior surface near the root of the cantilever beam modeled on the pressure surface of the airfoil. The strain at the cantilever root was reflected in the form of Bragg wavelengths (λB) detected by the FBG sensor when the cantileve
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Kozo, Fujii. "IL03 RECENT FINDINGS ON THE MECHANISM OF FLOW SEPARATION CONTROL BY MICRO DEVICES." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013): _IL03–1_—_IL03–4_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._il03-1_.

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Gad-el-Hak, Mohamad. "Flow Control." Applied Mechanics Reviews 42, no. 10 (1989): 261–93. http://dx.doi.org/10.1115/1.3152376.

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The ability to actively or passively manipulate a flow field to effect a desired change is of immense technological importance. In this article, methods of control to achieve transition delay, separation postponement, lift enhancement, drag reduction, turbulence augmentation, or noise suppression are considered. The treatment is tutorial at times, making the material accessible to the advanced graduate student in the field of fluid mechanics. Emphasis is placed on external boundary-layer flows although applicability of some of the methods reviewed for internal flows will be mentioned. An attem
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Lang, Amy, Philip Motta, Maria Laura Habegger, Robert Hueter, and Farhana Afroz. "Shark Skin Separation Control Mechanisms." Marine Technology Society Journal 45, no. 4 (2011): 208–15. http://dx.doi.org/10.4031/mtsj.45.4.12.

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AbstractDrag reduction by marine organisms has undergone millions of years of natural selection, and from these organisms biomimetic studies can derive new technologies. The shortfin mako (Isurus oxyrinchus), considered to be one of the fastest and most agile marine predators, is known to have highly flexible scales on certain locations of its body. This scale flexibility is theorized to provide a passive, flow-actuated mechanism for controlling flow separation and thereby decreasing drag. Recent biological observations have found that the shortfin mako has highly flexible scales, bristling to
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Luo, Shichao, Jun Liu, Hao Jiang, and Junyuan Wang. "Magnetohydrodynamic Control of Hypersonic Separation Flows." International Journal of Aerospace Engineering 2021 (January 13, 2021): 1–13. http://dx.doi.org/10.1155/2021/6652795.

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Magnetohydrodynamic (MHD) control of hypersonic laminar separation flows is investigated in this paper. A series of numerical simulations over various geometry configurations, namely, a compression corner and a double wedge ramp hypersonic inlet, have been conducted by application of an external electromagnetic field. Results show that the performance of MHD separation flow control is mainly determined by flow acceleration of the Lorentz force directed in the streamwise direction. The Joule heating term always brings negative effects on the MHD separation flow control and increased the static
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Dissertations / Theses on the topic "Control flow separation"

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Schulmeister, James Crandall. "Flow separation control with rotating cylinders." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78196.

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Thesis (S.M. in Ocean Engineering)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 61-62).<br>The hydrodynamic forces on ocean vehicles increase dramatically during sharp maneuvers as compared to forward motion due to large areas of separated flow. These large forces severely limit maneuverability and reduce efficiency. Applying active flow separation control to ocean vehicles would reduce resistance during maneuvers and thereby improve maneuvering performance. In this thesis I di
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Nilsson, Stefan. "Flow Separation Control Utilizing Plasma Actuators." Thesis, Luleå tekniska universitet, Rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69107.

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The goal of this thesis was to both theoretically and experimentally show the effect of a plasma actuator for flow separation control.  In the theoretical part a solver was implemented in MATLAB code, to solve the governing equations describing the plasma actuator.  The experimental part included PIV (Particle Image Velocimetry) measurements of the velocity field induced by the plasma actuator, visualization of the effect in a wind tunnel and the development of a simple model of the plasma actuator based on the empirical result whose purpose is to be used in CFD (Computational Fluid Dynamics).
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KASLIWAL, AMIT. "FLOW SEPARATION CONTROL FOR CYLINDER FLOW AND CASCADE FLOW USING GENERATOR JETS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1141413192.

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Kim, Kihwan. "Feedback control of flow separation using synthetic jets." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3252.

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The primary goal of this research is to assess the effect of synthetic jets on flow separation and provide a feedback control strategy for flow separation using synthetic jets. The feedback control synthesis is conducted based upon CFD simulation for a rounded backward-facing step. The results of the synthetic jet experiments on an airfoil showed that synthetic jets have the potential for controlling the degree of flow separation beyond delaying the onset of flow separation. In the simulation, while the jet is ejected slightly upstream from the separation point, the feedback pressure signal is
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Sunneechurra, Kailash. "Leading-edge flow separation control for high-lift." Thesis, University of Manchester, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517838.

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Kasliwal, Amit. "Flow separation control for cylinder flow and cascade flow using vortex generator jets." Cincinnati, Ohio : University of Cincinnati, 2006. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1141413192.

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Thesis (M.S.)--University of Cincinnati, 2006.<br>Title from electronic thesis title page (viewed Apr. 18, 2006). Includes abstract. Keywords: Flow Separation; Low Pressure Turbine Cascade; LPT Cascade; Flow over Cylinder; Vortex Generator Jets; VGJ; Multiblock Grid. Includes bibliographical references.
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Lögdberg, Ola. "Turbulent Boundary Layer Separation and Control." Doctoral thesis, KTH, Linné Flow Center, FLOW, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9821.

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Boundary layer separation is an unwanted phenomenon in most technical applications, as for instance on airplane wings, ground vehicles and in internal flow systems. If separation occurs, it causes loss of lift, higher drag and energy losses. It is thus essential to develop methods to eliminate or delay separation.In the present experimental work streamwise vortices are introduced in turbulent boundary layers to transport higher momentum fluid towards the wall. This enables the boundary layer to stay attached at  larger pressure gradients. First the adverse pressure gradient (APG) separation bu
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Urzynicok, Frank. "Separation control by flow-induced oscillations of a resonator." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968424929.

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Pasquale, Laura. "Robust feedback control of flow separation using plasma actuators." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/47943/.

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This thesis addresses the problem of controlling the unsteady flow separation over an aerofoil using plasma actuators, with the aim of improving the performance of fluid systems through the use of robust feedback controllers. Despite the complexity of the dynamics of interest, it is shown how the problem of controlling flow separation can be successfully formulated and solved as a simple output regulation problem. First, a novel control-oriented reduced-order model for nonlinear systems evolving on attractors is obtained. Its application to the incompressible Navier-Stokes equations is propose
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Resendiz, Rosas Celerino. "Numerical simulation of flow separation control by oscillatory fluid injection." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/2461.

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In this work, numerical simulations of flow separation control are performed. The sep-aration control technique studied is called 'synthetic jet actuation'. The developed code employs a cell centered finite volume scheme which handles viscous, steady and unsteady compressible turbulent flows. The pulsating zero mass jet flow is simulated by imposing a harmonically varying transpiration boundary condition on the airfoil's surface. Turbulence is modeled with the algebraic model of Baldwin and Lomax. The application of synthetic jet actuators is based in their ability to energize the boundary lay
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Books on the topic "Control flow separation"

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Chang, Paul K. Recent development in flow separation. Pang Han Pub. Co., 1985.

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Selby, Gregory V. Jet vortex generators for turbulent flow separation control. Old Dominion University Research Foundation, 1990.

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G, Allan Brian, and Institute for Computer Applications in Science and Engineering., eds. Closed-loop separation control using oscillatory flow excitation. ICASE, National Aeronautics and Science Administration, Langley Research Center, 2000.

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G, Allan Brian, and Institute for Computer Applications in Science and Engineering., eds. Closed-loop separation control using oscillatory flow excitation. ICASE, National Aeronautics and Science Administration, Langley Research Center, 2000.

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G, Allan Brian, Institute for Computer Applications in Science and Engineering., and Langley Research Center, eds. Closed-loop separation control using oscillatory flow excitation. Institute for Computer Applications in Science and Engineering, Langley Research Center, 2000.

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Ravindran, S. S. Active control of flow separation over an airfoil. National Aeronautics and Space Administration, Langley Research Center, 1999.

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Ravindran, S. S. Active control of flow separation over an airfoil. National Aeronautics and Space Administration, Langley Research Center, 1999.

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M, Abbott John, and United States. National Aeronautics and Space Administration., eds. Control of flow separation and mixing by aerodynamic excitation. NASA, 1990.

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M, Abbott John, and United States. National Aeronautics and Space Administration., eds. Control of flow separation and mixing by aerodynamic excitation. NASA, 1990.

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Dovgal, Alexander. Control of leading-edge separation on an airfoil by localized excitation. DLR, 1993.

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Book chapters on the topic "Control flow separation"

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Stalnov, Oksana, and Avraham Seifert. "On Amplitude Scaling of Active Separation Control." In Active Flow Control II. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11735-0_5.

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Meier, G. E. A. "Active Control of Boundary Layer and Separation." In Control of Flow Instabilities and Unsteady Flows. Springer Vienna, 1996. http://dx.doi.org/10.1007/978-3-7091-2688-2_5.

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Siauw, Wei Long, Jean Paul Bonnet, Jean Tensi, et al. "Collaborative Studies on Flow Separation Control." In IUTAM Symposium on Flow Control and MEMS. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6858-4_18.

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Luo, S. C., T. T. L. Duong, and Y. T. Chew. "Flow Separation of a Rotating Cylinder." In IUTAM Symposium on Unsteady Separated Flows and their Control. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9898-7_42.

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Wang, Longjun, Md Mahbub Alam, and Yu Zhou. "Flow Separation Control by Flexible Memetic Coverts." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-6211-8_11.

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Ming, Xiao, Xingyu Ma, Reinhard Geisler, and Peng Li. "Effective Synthetic Jet Control for Separation Control on BFS." In Advances in Effective Flow Separation Control for Aircraft Drag Reduction. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29688-9_14.

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Bonnet, Jean-Paul, and Ning Qin. "Active Flow Control Strategies and Tools for Turbulent Flows." In Advances in Effective Flow Separation Control for Aircraft Drag Reduction. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29688-9_1.

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Wassen, Erik, and Frank Thiele. "Separation Control in Diffuser Flow Using Periodic Excitation." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39604-8_41.

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Abe, Hiroyuki, Takehiro Nomura, Yoshihiro Kikushima, and Hiro Yoshida. "Smart Control of Flow Separation around an Airfoil." In Challenges of Power Engineering and Environment. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_107.

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Hu, Ruyun, Liang Wang, and Song Fu. "Modelling and Numerical Simulation for Flow Control." In Advances in Effective Flow Separation Control for Aircraft Drag Reduction. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29688-9_16.

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Conference papers on the topic "Control flow separation"

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Haas, Martin, Ray-Sing Lin, and Tory Brogan. "Boundary Layer Separation Control." In 1st Flow Control Conference. American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-2947.

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Mack, Steffen, Christoph Brehm, Benjamin Heine, Armin Kurz, and Hermann Fasel. "Experimental Investigation of Separation and Separation Control on a Laminar Airfoil." In 4th Flow Control Conference. American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-3766.

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Benton, Stuart I., and Miguel Visbal. "Investigation of High-Frequency Separation Control Mechanisms for Delay of Unsteady Separation." In 8th AIAA Flow Control Conference. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-4241.

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Funk, Rob, David Parekh, Tom Crittenden, and Ari Glezer. "Transient Separation Control Using Pulse Actuation." In 1st Flow Control Conference. American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3166.

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Gardarin, Benoit, Laurent Jacquin, and Philippe Geffroy. "Flow Separation Control With Vortex Generators." In 4th Flow Control Conference. American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-3773.

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Urzynicok, Frank, and Hans Fernholz. "Flow-Induced Acoustic Resonators for Separation Control." In 1st Flow Control Conference. American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-2819.

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Taubert, Lutz, Per Kjellgren, and Israel Wygnanski. "Generic Bluff Bodies with Undetermined Separation Location." In 1st Flow Control Conference. American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3068.

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Bhattacharjee, Debraj, Maziar Hemati, Bjoern Klose, and Gustaaf Jacobs. "Optimal Actuator Selection for Airfoil Separation Control." In 2018 Flow Control Conference. American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-3692.

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Tian, Ye, Qi Song, and Louis Cattafesta. "Adaptive Feedback Control of Flow Separation." In 3rd AIAA Flow Control Conference. American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-3016.

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NISHIOKA, M., M. ASAI, and S. YOSHIDA. "Control of flow separation by acoustic excitation." In 2nd Shear Flow Conference. American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-973.

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Reports on the topic "Control flow separation"

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Tian, Ye, III Cattafesta, and Louis N. Separation Control Using ZNMF Devices: Flow Physics and Scaling Laws. Defense Technical Information Center, 2007. http://dx.doi.org/10.21236/ada481565.

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Malmuth, Norman D., and Alexander V. Fedorov. Mathematical Fluid Dynamics of Store and Stage Separation, Multi-Body Flows and Flow Control. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada482146.

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Bons, Jeffrey P. Visualization of Flow Control Devices (VGJs) for Low Pressure Turbine Separation Control Using Stero PIV. Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada426129.

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Murawski, C. G. Control of Flow Separation on a Turbine Blade by Utilizing Tail Extensions. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada373507.

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Pombo, Carlos, and Luis H. Gutiérrez. Corporate Governance and Firm Valuation in Colombia. Inter-American Development Bank, 2007. http://dx.doi.org/10.18235/0010881.

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This paper studies the separation of ownership and control of 108 listed companies in Colombia from 1996 to 2002, finding that voting rights are greater than cash flow rights because of indirect ownership across firms. The paper also examines the association of various ownership and control measures and separation ratios with a firms value and performance for the same sample of companies that traded their stock from 1998 to 2002. Large blockholders were found to exert a positive influence upon a firms valuation and performance, which validates the positive monitoring approach of large sharehol
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Nagib, Hassan M., Mukund Acharya, Patrick H. Reisenthel, John L. Way, and David R. Williams. Management and Control of Separation by Unsteady and Vortical Flows. Defense Technical Information Center, 1988. http://dx.doi.org/10.21236/ada198902.

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Quak, Evert-jan. Russia’s Approach to Civilians in the Territories it Controls. Institute of Development Studies (IDS), 2022. http://dx.doi.org/10.19088/k4d.2022.041.

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This rapid review synthesises the literature from academic sources, knowledge institutions, non-governmental organisations (NGOs), and trusted independent media outlets on the approach used by the Russian government to provide any support or services to civilians in the territories it controls. The rapid review concludes that Russia provides economic, social, government, and military support to de facto states that it controls, such as Abkhazia, South Ossetia, Transnistria and the Donbas region. Russia covers large parts of the state’s budget of these separatist regions. This review uses the t
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Lahav, Ori, Albert Heber, and David Broday. Elimination of emissions of ammonia and hydrogen sulfide from confined animal and feeding operations (CAFO) using an adsorption/liquid-redox process with biological regeneration. United States Department of Agriculture, 2008. http://dx.doi.org/10.32747/2008.7695589.bard.

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The project was originally aimed at investigating and developing new efficient methods for cost effective removal of ammonia (NH₃) and hydrogen sulfide (H₂S) from Concentrated Animal Feeding Operations (CAFO), in particular broiler and laying houses (NH₃) and hog houses (H₂S). In both cases, the principal idea was to design and operate a dedicated air collection system that would be used for the treatment of the gases, and that would work independently from the general ventilation system. The advantages envisaged: (1) if collected at a point close to the source of generation, pollutants would
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