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Old   September 19, 2011, 06:04
Default Calculating Peclet no. for problem
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I need to calculate the Peclet no. to determine if an upwind scheme is better for my problem.

The Peclet no. is defined as LU/D

L = characteristic length, U = velocity, D the mass diffusion coefficient.

I am simulating a flow past an airfoil in air. Is U the inflow velocity?

L = airfoil length.

What about the mass diffusion coefficient? I only managed to get from wiki:

"Carbon dioxide in air has a diffusion coefficient of 16 mm2/s"

Hope someone can help. Thanks!
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