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ISSN オンライン: 2642-0554

DNS AND LES OF EXCITED RECTANGULAR JETS

Artur Tyliszczak
Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science Al. Armii Krajowej 21, 42-201 Czestochowa, Poland

Bernard J. Geurts
Multiscale Modeling and Simulation, J.M. Burgers Center, Faculty EEMCS, University of Twente, 7500 AE Enschede, The Netherlands Anisotropic Turbulence, Fluid Dynamics Laboratory, Department of Applied Physics, Eindhoven University of Technology

要約

The paper presents results of numerical studies devoted to an active flow control method applied to jet flow and focusses on rectangular jets with aspect ratio Ar = 1, 2 and 3. Square and rectangular jets are more unstable than their circular counterparts, which is expressed by an increased intensity of mixing. It is shown that the application of a suitable excitation (forcing) at the jet nozzle can qualitatively alter the character of the flow, resulting in an increased spreading rate of passive tracer. The excitation is obtained from a superposition of axial and helical forcing terms. We study the mixing in the flow upon varying parameters such as the frequency of the excitations and possible phase shifts between components. The numerical results are obtained applying LES and DNS based on a high-order compact difference code for the incompressible flows.