Large eddy simulation of a hot, high speed coflowing jet

Eastwood, Simon, Tucker, Paul G and Xia, Hao (2011) Large eddy simulation of a hot, high speed coflowing jet. In: ASME Turbo Expo 2011: Power for Land, Sea and Air, 6-10th June, 2011, Vancouver, British Columbia, Canada.

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Abstract

Computations are made of a short cowl coflowing jet nozzle with a bypass ratio 8 : 1. The core flow is heated, making the inlet conditions reminiscent of those for a real engine. A large eddy resolving approach is used with a 12 × 106 cell mesh. Since the code being used tends towards being dissipative the sub-grid scale (SGS) model is abandoned giving what can be termed Numerical Large Eddy Simulation (NLES). To overcome near wall modelling problems a hybrid NLES-RANS (Reynolds Averaged Navier-Stokes) related method is used. For y+ <= 60 a k–l model is used. Blending between the two regions makes use of the differential Hamilton-Jabobi (HJ) equation, an extension of the eikonal equation. Results show encouraging agreement with existing measurements of other workers. The eikonal equation is also used for acoustic ray tracing to explore the effect of the mean flow on acoustic ray trajectories, thus yielding a coherent solution strategy.

Item Type: Conference or Workshop Item (Paper)
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA0349 Mechanics of engineering. Applied mechanics > TA0357 Applied fluid mechanics
Depositing User: Hao Xia
Date Deposited: 04 Mar 2013 08:14
Last Modified: 04 Mar 2013 08:14
URI: http://sro.sussex.ac.uk/id/eprint/43853

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