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Wrong Result from Simulation...using Autodesk Project Falcon.. |
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March 1, 2013, 12:53 |
Wrong Result from Simulation...using Autodesk Project Falcon..
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#1 |
New Member
adi
Join Date: Feb 2013
Posts: 13
Rep Power: 13 |
What is Fd stand for in FALCON result? And if it is drag force then why am i getting lower drag force via calculation by using same coefficient of drag as shown in falcon.I m getting Cd approx 1.22 on a block of 1 m^2 cross section at the speed of 10m/s. then how it is possible that drag force calculated by the falcon is 83.189 N?? (Attached Photo)
While I am using formula for drag force .5*Cd*(rheo)*A*V^2 then i am getting 74.725 N (assuming the density of air 1.225 kg/m^3)...plz help if u can its really important for my project...or suggest me any alternative way... Thanks & Regards.. ADDY |
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March 1, 2013, 14:47 |
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#2 |
Member
Melih Meriç
Join Date: Apr 2011
Posts: 46
Rep Power: 15 |
We cant say completely wrong solution, actually theoretically most of the time cfd dont give "exact" solutions.
And there is and error about %11 not %50 or something because of this you should try different mesh size and check the mesh quailty and later then you can change your flow model. Try these things and see the changes.. may be you take more approximate solution. ;(%5 or something this is your decision actually) |
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March 4, 2013, 04:20 |
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#3 |
Senior Member
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 27 |
You should not expect to get better results from simulations. Maybe for some special artificial cases, but not for general ones.
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The skeleton ran out of shampoo in the shower. |
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March 4, 2013, 06:41 |
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#4 | |
Senior Member
andy
Join Date: May 2009
Posts: 308
Rep Power: 18 |
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