# Drag Coefficient over a Flat Plate

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 December 9, 2011, 11:07 Drag Coefficient over a Flat Plate #1 New Member   Russell Join Date: Sep 2011 Posts: 13 Rep Power: 5 How can you find the drag coefficient over a 2D flat plate? Thanks

December 9, 2011, 13:16
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 Originally Posted by rfar0028 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

 December 9, 2011, 14:08 #3 New Member   AeroSuresh Join Date: Nov 2011 Posts: 11 Rep Power: 5 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 __________________ ------------ AeroSuresh ------------

 December 10, 2011, 04:17 #4 New Member   Russell Join Date: Sep 2011 Posts: 13 Rep Power: 5 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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