Abstract
There are many important reviews about the flow characteristics in the body of the racing bike helmet caused by the relative motion of the air along the Trailing Edge shape. The lines formed in such a way in the speed field will form a streamline stream so that the lines are in line with the flow at each point in the flow field. Thus, the streamline will form a pattern of airflow around the helmet. This aerodynamic characteristic study was performed on time meter helmet body visualized numerically using Computational Fluid Dynamics (CFD) with Solid Work Flow Simulation software. With variation of Trailing Edge 25 mm, 75 mm, 125 mm. Urgency research about helm time trial is believed to provide information about the flow that occurred. The result shows that the drag coefficient reduction that occurs on the cut variation of 75 mm compared with other variations on the Reynolds number 1.16 x 105 of 0.395.
Highlights
Pressure and speed are the fundamental quantities in the concept of aerodynamics, the two parameters being the foundation for the development of concepts and applications of aerodynamics as well as the field of automotive (Fox et al, 2011).Currently, developing countries in the world much to make the technology grow and modern as in the world of cycling
The lines formed in such a way in the speed field will form a streamline so that the lines will be in the direction of the flow at each point in the flow field
Validation of fluid flow characteristics. This Oscillating Karman vortex is a phenomenon where fluid flow at the back of the time-trial helmet forms a recurrent vortex pattern caused by unsteady flow around the blunt bodies, so the fluid flow benchmark problem crosses the time-trial helmet with Reynolds number 1.00 x 105 generally there will be oscillating Karman vortex in the wake area behind the helmet area
Summary
Developing countries in the world much to make the technology grow and modern as in the world of cycling. The technology is widely used for research on aerodynamic flow and drag coefficient on racing bike helmets. The aerodynamic characteristics that occur in the body of the bicycle racing helmet is caused by the relative movement of the air along the shape of the body helmet. The lines formed in such a way in the speed field will form a streamline so that the lines will be in the direction of the flow at each point in the flow field. The streamline will form a pattern of airflow around the helmet
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