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discretization schemes for Gradient

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Old   July 30, 2013, 05:53
Default discretization schemes for Gradient
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I wonder if someone could enlighten me on the difference between the different discretization schemes (in fluent) for Gradient :

- Green gauss cell-based

- Green nodes cell-based

- Least Squares cell based

Thanks for all
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Old   September 26, 2013, 10:07
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Green-Gauses theorem to compute the cell centered gradient of a scalar as face-area-weighted average of the cell face centered valuse:
gradient=intergal(face value*vertor*aera)/Volume
if (Green-Gauss Cell based)
{the face value is taken from the arithmetic averge of the value at the neighboring cell centers }
if (Green-Gauss node based)
{the face value is taken from the arithmetic averge of the nodal value on the face}
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