Full-field dependence on inlet modeling of non-isothermal turbulent jets using validated LES

[+] Author and Article Information
Sasan Salkhordeh

Institute of Scientific Computing Texas A&M University, College Station, TX, 77840, USA

Mark Kimber

Department of Nuclear Engineering, Department of Mechanical Engineering Texas A&M University, College Station, TX, 77843, USA

1Corresponding author.

ASME doi:10.1115/1.4042373 History: Received August 30, 2018; Revised December 12, 2018


Inlet conditions for a turbulent jet are known to affect the near field behavior, but eventually lose their significance downstream. Metrics of importance are often derived from mean and fluctuating velocity components, but little has been done to explore inlet effects on transport of a scalar quantity (e.g., temperature). This paper aims to provide fundamental understanding in this regard, and employs large-eddy simulations (LES) of a non-isothermal round turbulent jet (Reynolds number of 16,000) with geometry and boundary conditions mimicked after a well-known experimental study. The jet inlet is first modeled with a standard Blasius profile, and next by performing a simulation of the upstream flow modeled with either Detached Eddy Simulations or LES for the second and third approaches, respectively. Only the model employing LES for both upstream nozzle and downstream jet is found to completely capture the rms temperature behavior, namely a distinct hump when normalized by the local mean centerline temperature at roughly five diameters downstream. Regarding the far field conditions, all three inlet conditions converge for the centerline values, but the radial distributions still portray non-negligible differences. Not surprisingly, the complete LES modeling approach agrees the best with experimental data for mean and rms distributions, suggesting the inlet condition plays a vital role in both the near and far field of the jet. The current effort is the very first LES study to successfully capture flow physics for a non-isothermal round turbulent jet in near and far field locations.

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