Inaccurate Drag coefficient

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 February 1, 2006, 06:33 Inaccurate Drag coefficient #1 Sandile Peta Guest   Posts: n/a I'm modelling a solar car in a wind tunnel in fluent using a laminar flow solver. The drag coefficient that I'm getting is very high, a value of approx 0.2, when the expected value should be about 0.1 for the specific airfoil that I'm using, what could be the possible problem?

 February 1, 2006, 07:18 Re: Inaccurate Drag coefficient #2 Alan Guest   Posts: n/a Turbulence model! Boundary Conditions! Turbulence Intensity! Your Mesh! Think about it and you will get close to the actual value, by the way it is very hard to predict drag in the first place! Alan.

 February 4, 2006, 00:31 Re: Inaccurate Drag coefficient #3 Ahmed Guest   Posts: n/a Drag Coefficient is the result of dividing the drag force by the kinetic energy of the free stream. Drag calculations are performed by applying the law of the wall, Check your Y+ values

 February 5, 2006, 06:11 Re: Inaccurate Drag coefficient #4 Freeman Guest   Posts: n/a And try to put a boundary layer around your model: between 6 or 7 layers at least. Start with a 1st order discretization scheme and then switch to 2nd order upwind (or QUICK if your mesh is made from hexa's.) Good luck!

 February 15, 2006, 12:05 Re: Inaccurate Drag coefficient #5 mariam Guest   Posts: n/a From: Miss Mariam Ibrahim Abidjan Cote d'Ivoire mariamibrahim1112@yahoo.fr Dear One, I am Miss Mariam Ibrahim,the Only Daughter of late Mr, BASHIR IBRAHIM the former rebelle suponsour leader in bouake west cost of cote d i'voire .I discoverd that my father deposited the sum of the sum of (10;800 000) Ten million eight hundred Thansand Million USA dollar in a security firm here in Abidjan ,and now i am in hiding in one of the city in Abidjan called Yopougoun . Due to infertility nature of my country politicaly, I wish to invest this money In your country. I also plead you help me on the investment part of the business, You have a free hand of operation. I will like you to send to me your telephone so that i will discuss with you in person so that i will send the name of the security firm to open contact with them for withdrawl of the consignment to move it to your country for investment. . The money is in the position of a security company as a family tresure. A legal process will take place to ensure mutual transfer. . All effort made to the successful of this transaction will highly be appreciated. I hope to get a favourable reply in due curse. We can negotiate on the terms of assistance. Best regards, Miss Mariam Ibrahim mariamibrahim1112@yahoo.fr

 February 17, 2006, 16:42 Re: Inaccurate Drag coefficient #6 Bill Guest   Posts: n/a the above post about "Miss Mariam Ibrahim" is a SCAM, in case you didnt know

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