Multidisciplinary Journal of Science and Technology

NUMERICAL STUDY OF TURBULENT SEPARATED FLOWS IN AXISYMMETRIC DIFFUSERS BASED ON A TWO-FLUID TURBULENCE MODEL

Shoev M.A

Fergana polytechnic institute, Uzbekistan

Rakhmankulov S.A

Fergana polytechnic institute, Uzbekistan

Qosimov A.Sh

Fergana polytechnic institute, Uzbekistan

Mandana Bayat

Islamic Azad University, Najafabad Branch, Iran

Keywords: Navier–Stokes equations, axisymmetric diffuser, separated flow, two-fluid model.

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Abstract

This paper discusses a numerical study of turbulent flow at Re = 1.56×10⁴ in an axisymmetric diffuser with half-angle expansion α=14°, 18° и 90°. The results obtained are compared with known experimental data. The flow at the diffuser inlet is fully developed turbulent. To simulate the flow, a relatively recently developed two-fluid turbulence model in the Comsol Multiphysics software package was used. The paper also presents numerical results of the well-known SST and SA turbulence models, which are included in the Comsol Multiphysics software package. It is shown that the two-fluid turbulence model in the Comsol Multiphysics software package is capable of producing more accurate results than known models. In addition, it demonstrated good convergence and stability.

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