Abstract

TOLENTINO MASGO, San Luis B.. Evaluation of Turbulence Models for the Air Flow in a Transonic Diffuser. Rev Politéc. (Quito) [online]. 2020, vol.45, n.1, pp.25-38. ISSN 2477-8990.  https://doi.org/10.33333/rp.vol45n1.03.

The flow field with the presence of shock waves, turbulence and flow separation is studied through the use of experimental equipment and can be reproduced using computational codes. In the present work the objective is to evaluate five turbulence models: $\mathbf{S}\mathbf{S}\mathbf{T}\mathit{}\mathit{k}-\mathit{\omega }$, $\mathit{k}-\mathit{e}$ standar, $\mathit{k}-\mathit{\omega }$ standar, transition $\mathit{k}-\mathit{k}\mathit{l}-\mathit{\omega }$ and $\mathbf{R}\mathbf{S}\mathbf{M}$, for the air flow with the presence of shock waves in a diffuser transonic. 2D numerical simulations of the flow field were performed by applying the RANS model in the ANSYS-Fluent code, which applies the finite volume method. The governing equations were used: conservation of mass, momentum, energy, and state; for viscosity versus temperature the Sutherland equation. In addition, density-based analysis for a compressible fluid was considered. Numerical results of static pressure profiles in the walls and of the velocity in different positions in the diffuser were obtained, as well as, of the density field, Mach number, static pressure, velocity and static temperature, for the pressure ratios $\mathit{r}\mathit{p}=\mathrm{0,82}$ and $\mathit{r}\mathit{p}=\mathrm{0,72}$, which were compared with experimental data published in the literature. It is concluded that the Menter $\mathbf{S}\mathbf{S}\mathbf{T}\mathit{}\mathit{k}-\mathit{\omega }$ turbulence model is more in tune with the experimental pressure and velocity data for the flow with the presence of shock waves.

Keywords : Transonic diffuser; Air flow; Turbulence model; Shock wave; Flow separation.

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