Calculating Peclet no. for problem -- CFD Online Discussion Forums

September 19, 2011, 06:04	Calculating Peclet no. for problem	#1
quarkz Senior Member TWB Join Date: Mar 2009 Posts: 400 Rep Power: 19	Hi, 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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