Human Powered Vehicle Study
Hi, I am currently conducting an investigation into the aerodynamics of a human powered vehicle such as seen here http://www.speed101.com/photos.htm
My aim is too closely match a published figure for a certain HPV of Cd=0.045
I am having some issues currently, my console is giving me limited tubulent viscoscity problems.
Could someone please suggest if any of my input conditions seem off?
Sparat Allmaras Model
Velocity=32.25 (0 yaw)
Turb viscosity ratio=5
Turb intensity=0.01 (value as seen, this means 1% right?)
Length scale 20m (half the domain height)
velocity scale = 0.4m/s
Im using a trimmer mesh, the object is close to the ground, no rotating wheels. I am using a wind tunnel type domain with slip walls as the far field boundaries.
Turbulent Intensity and Turbulent Length Scale
If you are going to use the turbulent intensity and turbulent length scale option then I'd guess (I'm not a Star CMM+ user) that:
In my opinion CFD is better suited to computing drag for different designs and using the relative difference (from a baseline) in value to make design decisions.
Hope this helps
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