Turbulence Modeling Verification For Bluff Body Flow

Cho, Hon Meng (2015) Turbulence Modeling Verification For Bluff Body Flow. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Turbulence Modeling Verification For Bluff Body Flow 24 Pages.pdf - Submitted Version Download (565kB)

Abstract

The current automobile industries need improvement on their vehicle design due to the development in technology every year. By determining the fluid flow characteristics and pattern on the vehicle using simulation, industries are able to alter their vehicle design to minimize drag force on the vehicle which is caused by turbulence. However, selecting the correct turbulence model will influence the results of the simulation obtained. The main objective of the study is to propose the most suitable turbulence model by comparing simulation results and experimental results. The study uses the reference Ahmed vehicle model as the simplified geometric body for the simulation and flow is generated around the Ahmed model. The study uses a scale of 1:1 with the original Ahmed model with the model height of 288mm and a slant angle of 35 degrees. The flow around Ahmed model is investigated by nine turbulence models available in the ANSYS FLUENT 15.0 CFD package. The results are compared using several criterions which are the flow features and pattern of the model, velocity profiles for U-velocity and the drag coefficient of the model. The simulations results compared well based on the experimental value given in the literature. The only turbulence model that predicted the most above the others are the k-omega (standard) model in this study. The k-omega (standard) model predicted well for the majority of the velocity profiles and the lowest percentage error for the comparison of drag coefficient. The comparison between the size of separation bubble and drag coefficient are not accurate. Several recommendations are stated to improve the results of this study.

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