Perbandingan Ketelitian Sejumlah Turbulen Model pada Simulasi Numerik Aliran Melewati Nosel Supersonik

Hanafi, Muhammad (2025) Perbandingan Ketelitian Sejumlah Turbulen Model pada Simulasi Numerik Aliran Melewati Nosel Supersonik. S1 thesis, Universitas Andalas.

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Abstract

A supersonic nozzle is designed to accelerate exhaust gases to supersonic speeds and is a critical component in jet and rocket engines. The exhaust gases produced from fuel combustion pass through a convergent-divergent nozzle, where the flow reaches sonic speed at the nozzle throat before being further accelerated in the divergent section. To ensure the nozzle operates optimally, performance testing is required, which can be conducted through experiments or numerical simulations. In numerical simulations, the selection of an appropriate turbulence model significantly impacts the accuracy of the results. This study aims to compare and evaluate several turbulence models, including Spalart-Allmaras (SA), SST k-ω, and k-ε, in predicting the flow distribution in a supersonic nozzle using CFD simulations performed with ANSYS Fluent. The simulation results indicate that all three turbulence models provide similar distributions of Mach number and static pressure along the nozzle. The SST k-ω model is considered the most stable in handling high-pressure gradients, making it the most suitable choice for predicting flow characteristics in the design of supersonic nozzles.

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