Studi Numerik Steady RANS Aliran Fluida di Dalam Asymmetric Diffuser

Authors

  • Yiyin Klistafani Jurusan Teknik Mesin

DOI:

https://doi.org/10.31963/intek.v4i1.100

Abstract

Research on fluid flow becomes a necessity to develop technology and for the welfare of human beings on earth. One of them is study of fluid flow in the diffuser. The example of diffuser application is used as a flue gas duct in the car or motorcycle. In addition, diffuser is also applied in air conditioning systems. Diffuser is a construction that able to control the behavior of the fluid. The increasing of cross section area in the diffuser will generate a positive pressure gradient or also called adverse pressure gradient (APG). The greater APG that happens, the greater energy required by the fluid to fight it, because APG will lead to separation. This study aimed to evaluate the numerical fluid flow in the asymmetric diffuser with divergence angle (θ) = 10 ° (upper wall) and widening one vertical side (α) of 20 ° (front wall). The Reynolds number is 8.7 x 104 by high inlet diffuser and the maximum velocity at the inlet diffuser. Turbulence models used are standard k-ɛ, realizable k-ε, and shear stress transport (SST) k-ω. Numerical study of steady RANS used Fluent 6.3.26 software. Results of numerical visualizations show that huge vortex established in diffuser, that’s why performance of diffuser is not optimal. In addition the location of separation point shown by SST k-ω is earlier than other turbulence models (standard k-ε and realizable k-ε).

Author Biography

Yiyin Klistafani, Jurusan Teknik Mesin

Politeknik Negeri Ujung Pandang

References

Charles, H., Benoit, T.,“Reynolds-Averaged Navier-Stokes

Modelling for Industrial Applications and Some Challenging

Issuesâ€, Department of Fluid Mechanics,Vrij Uuniversiteit,

Brussel, Belgium, 2009.

El-Behery, S.M., Hamed, M.H, 2011, “A Comparative Study

of Turbulence Models Performance for Turbulent Flow in a

Planar Asymmetric Diffuserâ€, International Journal of

Mechanical Systems Science and Engineering, vol.2 no.2, 78-

, 2011.

Ikhwan, Nur, “Validasi Pemodelan Heat Exchanger Dalam

Computational Fluid Dynamics (CFD)â€, Research report,

Teknik Mesin ITS, Surabaya, 2010.

Launder B. E., Spalding D.B, “Mathematical Models

Turbulenceâ€, Lecturer Notes, Imperial College of Science and

Technology, London, England, 1974.

Menter, F. R., “Two-Equation Eddy-Viscosity Turbulence

Models for Engineering Applicationsâ€, AIAA Journal, Vol. 32,

, pp. 15981605.

Yiyin, K., “Experimental and Numerical Study of Steady-

RANS Turbulent Flow Characteristics in Asymmetric Diffuser

with Constant Aspect Ratioâ€, Master Thesis, Mechanical

Engineering ITS, Surabaya, 2013.

Published

2017-05-03

Issue

Section

ARTICLES