Flow Stability Research Group
Research keywords:
· flow stability
· aerodynamic drag
· drag reduction
· noise
· noise reduction
· musical instruments
· turbulence
Horizon Europe keywords:
· Smart and sustainable transport and mobility
Introduction of the Research Group
Fluid flow is usually accompanied by flow oscillations. Their origin usually lies in flow instabilities. Our research group deals with the modelling of instabilities and the novel solution of associated problems. One of these areas is the drag force, generated by the motion of streamlined bodies in fluids. After a certain distance from the beginning of the body turbulence arises. This increases the force necessary for the forward movement roughly by one order of magnitude. Our group investigates such surface structures and miniature vortex generators that prevent or significantly delay the transition into turbulence. Our mathematical methods are mostly worked out for incompressible flows.
In other cases, the flow oscillation is accompanied by significant sound emission. In some cases, this is desirable, for example in wind instruments. IN other cases it should be avoided, for example noise generated by gaps of vehicles, which is harmful for the passengers, for the structure and for the environment. Here the problem is aggravated by the strong coupling of the flow oscillation and the acoustics. Our research group develops novel modelling methods, with which the phenomena can be described with sufficient accuracy. The methods are used for modelling musical instruments, such as the recorder and the organ pipe. Moreover, we also investigate the flow oscillations and sound created in gaps, as well as ways to reduce these.
Watch our 3-minute introductory video:
Achievements
-The development of an elastic coating that delays the laminar-turbulent transition in water-Matlab software package for investigating parallel flows
Publications
Nagy Péter Tamás; Szabó András; Paál György: A feedback model of the edge tone, using the adjoint Orr-Sommerfeld equation, JOURNAL OF FLUID MECHANICS 915 Paper: A13 , 28 p. (2021)Nagy Péter Tamás; Szabó András; Paál György: The effect of spanwise and streamwise elastic coating on boundary layer transition, JOURNAL OF FLUIDS AND STRUCTURES 110 p. 103521 Paper: 103521 (2022)
Nagy, Péter Tamás; Paál, György: Stabilization of the boundary layer by streamwise control, PHYSICS OF FLUIDS 31 : 12 p. 124107 (2019)
Nagy Péter Tamás; Rucz Péter; Szabó András: Examination of jet growth and jet-drive in the recorder by means of linearized numerical and lumped models, JOURNAL OF SOUND AND VIBRATION 527 p. 116857 Paper: 116857 (2022)
Paál, György; Vaik, István: Unsteady phenomena in the edge tone, INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW 28 : 4 pp. 575-586. , 12 p. (2007)
Awards
Hungarian Order of Merit, Officer's Cross, 2019Journals
Journals: Journal of Fluid Mechanics, Journal of Fluids and Structures, Physical Review E, Journal of Sound and Vibration, Journal of The Acoustical Society of America, Physics of Fluids Journal of Heat and Fluid FlowProjects
Innovative drag reduction of streamlined vehicles by miniature vortex generators CELSA 2021-2023Aeroacoustic investigation of the cavity tone, OTKA - National Scientific Research Fund, 2009-2012
Sensitivity of jets and shear layers, OTKA - National Scientific Research Fund, 2017-2022.
Innovative drag reduction of streamlined vehicles by miniature vortex generators, CELSA 2021-2023
Conferences
12th European Fluid Mechanics Conference, 2018, Vienna14th European Fluid Mechanics Conference, EFMC, 2022, Athen
International Symposium on Bifurcations and Instabilities in Fluid Dynamics, BIFD 2019, Limerick
International Symposium on Bifurcations and Instabilities in Fluid Dynamics, BIFD 2022, Groningen
European Drag Reduction and Flow Control Meeting, EDRFCM 2019
Conference on Modelling Fluid Flow, CMFF, 2009, 2012, 2015, 2018, 2022, Budapest