Verification of CFD method for vehicle flow simulation

Ang, Chan Yong (2021) Verification of CFD method for vehicle flow simulation. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Computational Fluid Dynamics (CFD) had been introduced as an engineering tool that was devoted to the solution of fluid flow through computers. However, the question had arisen on how confidence in modelling and simulating be critically accessed. Verification of the CFD approach was conducted to determine the prediction of the results. Ahmed model, which was devised by Ahmed, was designed and simulated via ANSYS fluent. Four verification methods were applied for this research, such as grid independence test, comparison of turbulence models, comparison of time flow and changes of the downstream length of the domain. Each method was labelled as Step, and the drag coefficient from the simulated result was compared with the experimental result conducted by Ahmed in 1984 (Co = 0.29). In Step 1, the grid-independent test showed that the Medium meshing had a percentage error of only 1.88%, which was chosen as it had the closest result to the experimental result. In Step 2, the initial turbulence model, K-epsilon was chosen as it had a nearer result with a percentage error of l .88%, compared to K-omega with a percentage error of 11 .95%. As for Step 3, the comparison between the steady flow and transient flow showed that the result of the transient flow was preferable as it greatly pulled the difference between the simulated result and the experimental result to a minor error of 0. 17% only. For the last step, the changes in the downstream length of the domain barely affect the drag and lift coefficient. The drag and lift coefficient shown in the results be consistent, despite the increase of downstream length. The numerical results in this project were determined and the CFD approach on the vehicle flow simulation was verified.

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