Comparative Evaluation of RANS Turbulence Closures for Swirling Flow Analysis in a High-Angle Conical Diffuser

کد مقاله : 1525-ISME2026

نویسندگان

Amirmehran Mahdavi *1، Hamidreza Azmi2 1هیات علمی 2دانشجو

چکیده مقاله

The present study numerically investigates the performance of a 30° conical diffuser under swirling inlet conditions, a configuration prevalent in turbomachinery exhaust systems. While previous studies focused on the RNG k-ε model, the complex nature of swirl-induced adverse pressure gradients necessitates a comparative evaluation of turbulence closures. Using ANSYS Fluent, the flow field was simulated using Standard k-ε, Realizable k-ε, and k-ω SST models. Results were validated against established numerical data, showing that while k-ε variants predict the core flow features, the k-ω SST model provides distinct insights into the near-wall separation zones and turbulent kinetic energy distribution. The analysis reveals that the 30° angle leads to significant flow detachment, where the choice of turbulence model substantially affects the predicted static pressure recovery.

کلیدواژه ها

RNG k-ε, SST k-ω, Standard k-ε, Realizable k-ε

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