The Flow Behaviour and Backpressure in Exhaust Muffler for Cars using Computational Fluid Dynamics


Keywords: Backpressure, Computational Fluid Dynamics, Exhaust System, Flow Rate, Muffler


This research aims to design and analyse exhaust muffler in cars using Computational Fluid Dynamics (CFD). Exhaust mufflers in cars commonly have noise insulation and typical design to baffle the sound. In this research, the geometrical model of the car muffler was designed using Computer Aided Design (CAD) software. Meanwhile, the mass flow rate and the backpressure of the car muffler were analysed using CFD software. The influence of mass flow rate and the backpressure on the design of the car muffler had been studied. From the simulations, the critical points on the exhaust muffler part had been identified and some modifications were made to the current car exhaust muffler design to improve its performance. The trend of the mass flow rate and backpressure of the modified exhaust system was obtained. It can be observed that the mass flow rate of the exhaust gas had increased and meanwhile the backpressure decreased. It can be concluded that the modified car exhaust muffler design has increased flow rates and decreased backpressure which resulted in better engine performance.


Chaudhari, K. C., & Engineer, M. (2017). Performance Optimization of Perforated Muffler using CFD Analysis. International Journal for Scientific Research & Development, 5(08), 134–137.
Christopher George, T., & Vinod Raj, H. G. (2018). Energy Efficient Design and Modification of an Automotive Exhaust Muffler for Optimum Noise, Transmission loss, Insertion loss and Back pressure: A Review. IOP Conference Series: Materials Science and Engineering, 377(1).
Guhan, C. P. O. A., Arthanareeswaran, G., Varadarajan, K. N., & Krishnan, S. (2018). Exhaust System Muffler Volume Optimization of Light Commercial Vehicle Using CFD Simulation. Materials Today: Proceedings, 5(2), 8471–8479.
Khairuddin, M. H., Said, M. F. M., Dahlan, A. A., & Kadir, K. A. (2018). Review on resonator and muffler configuration acoustics. Archives of Acoustics, 43(3), 369–384.
Mahata, T. K. (2017). CFD Analysis and Modification of Muffler of 1067 cc4 Cylinder Inline Engine for Better Performance. International Journal of I.C. Engines and Gas Turbines, 3(1), 40–46.
Milad, E. M., & Jolgaf, M. (2017). Acoustic Analysis of a Perforated-pipe Muffler Using ANSYS. Engineering Academy Tajoura, 4(19), 45–56.
Mishra, P. C., Ishaq, R. B., & Khoshnaw, F. (2021). Mitigation strategy of carbon dioxide emissions through multiple muffler design exchange and gasoline-methanol blend replacement. Journal of Cleaner Production, 286, 125460.
Mishra, P. C., Kar, S. K., & Mishra, H. (2018). Effect of perforation on exhaust performance of a turbo pipe type muffler using methanol and gasoline blended fuel: A step to NOx control. Journal of Cleaner Production, 183(x), 869–879.
Mohamad, B. (2019). A review of flow acoustic effects on a commercial automotive exhaust system - methods and materials. Journal of Mechanical and Energy Engineering, 3(2), 149–156.
Mohammad, M., Buang, M. M. A., Dahlan, A. A., Khairuddin, M. H., & Muhamad Said, M. F. (2017). Simulation of automotive exhaust muffler for tail pipe noise reduction. Jurnal Teknologi, 79(7–4), 37–45.
Ramu, S., Srinivasan, R., Somasundaram, S., & Achamyeleh, T. (2017). Design of exhaust silencer muffler for transmission losses with the performance of a four stroke diesel engine with and without muffler section. International Journal of Mechanical Engineering and Technology, 8(1), 139–145.
Ranjbar, M., Arslan, H., & Orak, M. (2018). Effect of Geometry Modification on Sound Transmission Loss in Multi-Chamber Muffler Effect of Geometry Modification on Sound Transmis-sion Loss in Multi-Chamber Muffler. International Conference on Acoustic and Vibration, 1–12.
Shinde, P. V, P.M., G., R.A, B., Y.B, M., & P.B, S. (2017). A Review on Muffler Design for Exhaust Noise Attenuation. International Journal of Engineering and Technology, 9(3S), 428–431.
Trivedi, S. M. (2017). CFD Flow Analysis and Optimization of Exhaust Muffler. International Journal for Research in Applied Science and Engineering Technology, V(VIII), 86–91.
Vijaya Narasimhan, S., Mahesh, S., Sivan, M., & Nair, S. S. (2020). CFD case studies on the acoustic performance and backpressure changes on modified reactive mufflers. AIP Conference Proceedings, 2283(October).
Zhu, Y. wei, Zhu, F. wang, Zhang, Y. shan, & Wei, Q. guo. (2017). The research on semi-active muffler device of controlling the exhaust pipe’s low-frequency noise. Applied Acoustics, 116, 9–13.
How to Cite
ROSMAN, S. (2023). The Flow Behaviour and Backpressure in Exhaust Muffler for Cars using Computational Fluid Dynamics. Selangor Science & Technology Review (SeSTeR), 7(2), PREPRINT. Retrieved from