Title: Flow and wall shear rate analysis for a cruciform jet impacting on a plate at short distance

Authors: Florin Bode; Amina Meslem; Claudiu Patrascu; Ilinca Nastase

Addresses: Department of Mechanical Engineering, Technical University of Cluj-Napoca, B-dul Muncii 103-105, 400641, Cluj-Napoca, Romania; CAMBI Research Centre, Technical University of Civil Engineering Bucharest, B-dul Pache Protopopescu 66, 021407, Bucharest, Romania ' LGCGM, University or Rennes, Rue du Clos Courtel, BP 90422, 35704 Rennes Cedex 7, France ' Hydraulics Department, University Politehnica of Bucharest, Splaiul Independenței 313, 060042, Bucharest, Romania ' CAMBI Research Centre, Technical University of Civil Engineering Bucharest, B-dul Pache Protopopescu 66, 021407, Bucharest, Romania

Abstract: There are numerous turbulence models that have been developed in the past years, many of them being used in predicting flows, turbulence, mass and/or heat transfer. The particular case of an impinging jet implies all of the above. The performance of eight highly used Reynolds averaged Navier-Stokes turbulence models is examined in simulating a very sheared lobed impinging jet. The study is based on the investigation of an orthogonally lobed jet, impinging on a flat surface that flows out from a nozzle having a cruciform cross-section at a Reynolds number of 5620. Two experimental methods were implied for the comparison with numerical results. For the measurement of the wall shear rate an electrodiffusion method was employed. The velocity flow fields were measured using particle image velocimetry technique. The relative strengths and drawbacks of the SST k-ω, k-ω, TransSST, k-ε realisable, RNG k-ε, k-ε, k-kl-ω and RSM turbulence models are compared.

Keywords: impinging jet; numerical simulation; PIV; electrodiffusion; velocity field; wall-shear rate.

DOI: 10.1504/PCFD.2020.107276

Progress in Computational Fluid Dynamics, An International Journal, 2020 Vol.20 No.3, pp.169 - 185

Received: 18 Feb 2019
Accepted: 30 Aug 2019
Published online: 11 May 2020 *

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