# Flow Over a Flat Plate

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 January 20, 2011, 13:01 Flow Over a Flat Plate #1 New Member   Brady Join Date: Jan 2011 Location: Calgary, Alberta, Canada Posts: 12 Rep Power: 14 Hello, I am fairly new to CFD and CFX. I am attempting to model an inclined (high angle) flat plate with a flow over it. The goal is to calculate the force and moments generated by the flow. A variable I will be adjusting is the height of the plate from a solid surface. I am starting with a 2D analysis. I would like to get some opinions on whether my approach and set-up is reasonable. I have created the geometry, my control volume is 0.1m thick. Currently for meshing I have a minimum edge length as 0.1m to force CFX to do 2D. I used CFX-Meshing Method. I have an inlet set to normal velocity. I have an outlet opposite to the inlet set to 0 relative pressure. The sides are symmetry planes. The top is an opening with opening press and dirn. The bottom is a smooth wall with no slip. The plate itself is a smooth wall with no slip. I am using medium 5% turbulence. Do these boundaries sound reasonable? Should I be using inflated boundaries along the bottom surface? How about along the surface of the plate? Is there a rule of thumb for the size of my control volume? I am then using a polyline to plot the pressure along the front and back surfaces of the plate. Finally, if anyone knows of any good resources for flat plate aerodynamics(calculating Cd, Cl, Cp, etc) that would be great. Thank you for your advice.

January 20, 2011, 21:09
#2
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Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,326
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Quote:
 Is there a rule of thumb for the size of my control volume?
No. Have a guess, then halve it and do a sensitivity check. Keep refining until you get the desired accuracy.

Quote:
 Do these boundaries sound reasonable?
If that matches your intended case then yes, they sound reasonable.