# Question about J D Andersons CFD Introduction book

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 July 20, 2008, 05:49 Question about J D Andersons CFD Introduction book #1 siw Guest   Posts: n/a Hi, I'm working through CFD: The Basics with Applications by J D Anderson in preparation to a CFD course later this year. But I'm a bit confused with two equations, numbers 5.9 and 5.13. They both have a partial derivative d^2/dn in them. Why is the dn part not dn^2? I don't know how to insert math characters but the 'd' are partial derivatives and n is the greek letter eta, used for an axis in the computational plane. Thanks. Please don't turn this topic into a discussion on peoples opinions of introductory level CFD books and their preferences.

 July 20, 2008, 09:00 Re: Question about J D Andersons CFD Introduction #2 Nabi Guest   Posts: n/a I think it is a type mistake.

 July 20, 2008, 12:59 Re: Question about J D Andersons CFD Introduction #3 san Guest   Posts: n/a Nabi is right. Its just typing mistake. It should be d^2/d(eta)^2

 July 21, 2008, 02:28 Re: Question about J D Andersons CFD Introduction #4 siw Guest   Posts: n/a Thanks, I'll add it to the list of others I've found, which is 15 now and I'm only up to page 175. Does anyone know how to solve the problems in Chapter 3 about classifying PDEs? Because the Cramer's rule and eigenvalue method in the text is for systems of two equations but the end of chapter problems are for one equation. So I'm not sure how to apply the methods to the problems. Thanks.

 July 22, 2008, 06:33 Re: Question about J D Andersons CFD Introduction #5 siw Guest   Posts: n/a Also, were do you start for the solution to the density equation in Problem 2.1? Thanks.

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