# Discretization

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 December 22, 2003, 11:55 Discretization #1 Christian Guest   Posts: n/a Does anyone know when Fluent does a 1.st order approx. if it is a forward or backward step? And I guess that when using 2.order it is a central difference? Cheers and a merry christmas and a happy new year to all.

 December 22, 2003, 12:36 Re: Discretization #2 ap Guest   Posts: n/a Both 1st order and 2nd order schemes are "upwind". Second order scheme uses central differences. Hi and Merry Christmas ap

 December 23, 2003, 15:54 Re: Discretization #3 Jun Guest   Posts: n/a Agree on the first statement--"both 1st order and 2 nd order schemes are upwind.". The second statement is confusing. Central difference is only applicable for the convection term when using LES in fluent as I found from the fluent manual. Am I right? Have a nice holiday! Jun

 December 23, 2003, 17:38 Re: Discretization #4 ap Guest   Posts: n/a When you choose a discretization scheme in the Solve->Controls->Solution panel, that scheme will be used only to compute the convective term of the corresponding equation. On the second order scheme, FLUENT manual says (§. 24.2.3) that higher-order accuracy is achieved at cell faces through a Taylor series expansion of the cell-centered solution about the cell centroid. The variable and the gradient are cell centered, while the displacement vector is from the upstream cell centroid to the face centroid. Hi and Merry Christmas ap

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