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 rfar0028 December 9, 2011 11:07

Drag Coefficient over a Flat Plate

How can you find the drag coefficient over a 2D flat plate?

Thanks

 truffaldino December 9, 2011 13:16

Quote:
 Originally Posted by rfar0028 (Post 335297) How can you find the drag coefficient over a 2D flat plate? Thanks
You can find it by using google or a standard fluid dynamics textbook

 aero_suresh December 9, 2011 14:08

Drag coefficient cd examples

In general, is not an absolute constant for a given body shape. It varies with the speed of airflow (or more generally with Reynolds number). A smooth sphere, for example, has a that varies from high values for laminar flow to 0.47 for turbulent flow.

cd Shapes
0.001 laminar flat plate parallel to the flow (Re<10^5)
0.005 turbulent flat plate parallel to the flow (Re>10^5)
0.1 smooth sphere (Re=10^6)
0.195 General Motors EV1 1996
0.24 Mercedes-Benz E-Class Coupé 2010
0.25 3rd Generation Toyota Prius
0.295 bullet (not ogive, at subsonic velocity)
0.48 rough sphere (Re = 10^6)
0.7 a typical bicycle plus cyclist
1.0–1.1 skier
1.0–1.3 wires and cables
1.0–1.3 man (upright position)
1.1-1.3 ski jumper
1.28 flat plate perpendicular to flow (3D)
1.3–1.5 Empire State Building
1.8–2.0 Eiffel Tower
1.98–2.05 flat plate perpendicular to flow (2D)
2.1 a smooth brick

Reference: http://en.wikipedia.org/wiki/Drag_coefficient

 rfar0028 December 10, 2011 04:17

I'm sorry I didn't explain very well but I requested a method of finding the drag coefficient over a 2D flat plate using CFD (Ansys Fluent)

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