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DNS of a jet in cross flow with passive scalar mixing

DOI: 10.1615/ICHMT.2015.THMT-15.910
pages 443-446

Zhao Wu
Modelling and Simulation Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK

Dominique R. Laurence
Modelling and Simulation Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK; EDF R&D, Fluid mechanics, Energy and Environment, 78401 Chatou, France

I. Afgan
Modelling & Simulation Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, M13 9PL Manchester, UK; Institute of Avionics & Aeronautics, Air University, E-9, Islamabad, Pakistan

Sinopsis

Direct numerical simulation (DNS) with high-order compact scheme (Incompact3d) is used for simulating a jet in cross flow (JICF) with passive scalar mixing and wall heat transfer. The low momentum laminar circular jet is orthogonal to the walls of a turbulent channel flow generated using recycling technology. Instantaneous and time-averaged profiles from DNS confirm important dynamic flow structures of JICF, including the shear layer vortices, horseshoe vortex formation, the 3D near-wall back-flow after the jet, and the formation of counter-rotating vortex pair. Four different Reynolds Averaged Navier Stokes (RANS) models are also tested for the JICF in comparison to the DNS data. The velocity and temperature predictions from all RANS models are found to produce only qualitative agreement with the DNS, however the predictions of kinetic energy and wall heat transfer produced by all four RANS models are unsatisfactory. Wall temperature fluctuation variance from the DNS is also presented.

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