A DNS study of jet control with microjets using an immersed boundary method
| Autor: | Eric Lamballais, Sylvain Laizet, Rémi Gautier |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
Jet (fluid) Work (thermodynamics) Turbulence Mechanical Engineering Computational Mechanics Direct numerical simulation Energy Engineering and Power Technology Aerospace Engineering Mechanics Immersed boundary method Condensed Matter Physics Core (optical fiber) Classical mechanics Mechanics of Materials Turbulence kinetic energy Excitation |
| Zdroj: | International Journal of Computational Fluid Dynamics. 28:393-410 |
| ISSN: | 1029-0257 1061-8562 |
| Popis: | In this work, a microjet arrangement to control a turbulent jet is studied by means of direct numerical simulation. A customised numerical strategy was developed to investigate the interactions between the microjets and the turbulent jet. This approach is based on an improved immersed boundary method in order to reproduce realistically the control device while being compatible with the accuracy and the parallel strategy of the in-house code Incompact3d. The 16 converging microjets, so-called fluidevrons, lead to an increase of the turbulent kinetic energy in the near-nozzle region through an excitation at small scale caused by the interaction between the fluidevrons and the main jet. As a consequence, very intense unstable ejections are produced from the centre of the jet toward its surrounding. Further downstream, the turbulent kinetic energy levels are lower with a lengthening of the potential core compared to a natural jet, in agreement with experimental results. |
| Databáze: | OpenAIRE |
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