Analysis of the Effect Variation of Sides Racing Bike Helmets on Flow Characteristics Using CFD

Syamsuri Syamsuri, Zain Lillahulhaq, Muhammad Mufarrichi

Abstract


The selection of materials and aerodynamic design forms needs to be considered in designing a comfortable helmet. The emergence of the drag force on the helmet causes a compressive force, which causes the rider discomfort when driving at high speeds. This research was conducted on 4 variations of helmet models consisting of 1 time-trial type helmet as a reference and 3 other helmets which were developed from the basic model. This simulation was conducted in a 2D helmet model at Re 7.14 x 104, 1.00 x 105, and 1.16 x 105. In this study, Turbulence Intensity was varied as 0.1%, 0.2%, and 1%. The results are shown through the drag coefficient's value and visualization of streamlined flow. The results showed that the 2D simulation on the helmet produced a lower error by using Set Up Turbulence Intensity 0.1%. The emergence of the Oscillating Karman vortex in large size indicates the higher the drag force that occurs on the helmet. In this study, helmet type 3, with a trailing edge and has a smooth curve, has the lowest drag force at Re 1.16 x 105 with a drag coefficient value of around 0.38.


Keywords


Helmet, Oscillating Karman vortex, Drag Coefficient

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DOI: http://dx.doi.org/10.24127/trb.v13i1.2699

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TURBO : Jurnal Program Studi Teknik Mesin
Program Studi Teknik Mesin Universitas Muhammadiyah Metro
ISSN (online) : 2477-250X
ISSN (cetak)  : 2301-6663
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