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Frontal Area report issue

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Old   August 21, 2014, 12:54
Default Frontal Area report issue
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Andrew Payne
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Hi

Im trying to run some validation simulations prior to doing so aerodynamic work.

I am running a half body model of an Ahmed body but the front area report is consistently wrong. I ran the simulation anyway to see how bad the results would be and was leading to a Cd and Cl values around 1e23.

I have the frontal area report with:
units: m^2
view up: 1 0 0
normal: 0 0 1
Regions: all regions except domain (which is just ahmed body)

the frontal area im getting is .208 m^2

where a half body frontal area is .056016

flow is traveling in x direction with z as vertical
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Old   August 21, 2014, 15:52
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Andrew Payne
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To guarentee i had an issue i inserted a 1mx1m extruded square with an angle at the back similar to the ahmed body. Obviously the frontal area should be 1m^2 yet it is .495 according to Star-ccm+

please if anyone has any idea to what is messing up. Im on a little bit of a time crunch.
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Old   August 22, 2014, 05:10
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Ping
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if the flow is in x then your normal vector should be in x too, ie 1,0,0 - you are measuring in z!
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Old   August 22, 2014, 22:16
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thanks.

I was following a tutorial as im rather new to star-ccm+
I thought that part was weird and it is working now.
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