Page 48 - FYP Abstract BETA Mech, Mechatronics, MD_Neat

Final Year Project 2020/2021

CFD Analysis of Airflow in Exhaust

Student’s Name: Wan Muhammad Afif Bin Wan Mohd Nasir
Supervisor’s Name: Awang bin Idris

Supervisor’s Email: awang@unikl.edu.my

Abstract The temperature distribution in the muffler components is derived from
Computational Fluid Dynamics (CFD) analysis to analyze the thermal stress. In the typical
wind tunnel, the full motorcycle with a comprehensive exhaust system is modelled using
commercial CFD software. For natural and adverse operating conditions, the conjugate heat
transfer (CHT) analysis considers the transfer of heat between hot exhaust gases moving
through the muffler assembly, solid components of the muffler and external air flowing over
the motorcycle. Also considered are the heat generation in the catalytic convertor and the
radiation between components of the muffler. In parallel, a commercially available FEA code
models the complete muffler assembly. Including the bushings and bolted ties, all muffler
mountings are considered. For each of the muffler elements, material properties are defined. In
the simulation of thermal expansion, stress and deformation in the exhaust system, the
temperature distribution obtained from CFD analysis is applied.

Keywords Computational Fluid Dynamics (CFD), conjugate heat transfer (CHT) exhaust,
airflow, simulation

Bachelor of Engineering Technology (Hons) in Mechanical (Automotive) 46
Bachelor of Engineering Technology (Hons) in Mechatronics (Automotive)
Bachelor of Engineering Technology (Hons) in Mechanical Design