[mwmalkawi]

I have come across many gradSchemes the problem i am trying to list them from most accurate ones to least accurate, i would appreciate if anyone can review the below list based on accuracy :-

1- Gauss linear
2- Gauss pointLinear
3- leastSquares
4- pointCellsLeastSquares
5-cellLimited<cubic> 1.5 Gauss linear 1
6- cellLimited leastSquare 1
7- cellLimited Gauss pointLinear 1
8- cellMDLimited Gauss linear 1
9- cellLimited Gauss linear 1

or if you are familiar with any of above maybe you can give an insight

Thanks

[guin]

May this be a good starting point for you?
https://www.openfoam.com/documentati...t-example.html

[mwmalkawi]

Thank you i checked the page but couldn't understand how to know which is more accurate than the other and how to compare maybe you can please explain a bit more thanks

[Santiago]

Originally Posted by mwmalkawi

I have come across many gradSchemes the problem i am trying to list them from most accurate ones to least accurate, i would appreciate if anyone can review the below list based on accuracy :-

1- Gauss linear
2- Gauss pointLinear
3- leastSquares
4- pointCellsLeastSquares
5-cellLimited<cubic> 1.5 Gauss linear 1
6- cellLimited leastSquare 1
7- cellLimited Gauss pointLinear 1
8- cellMDLimited Gauss linear 1
9- cellLimited Gauss linear 1

or if you are familiar with any of above maybe you can give an insight

Thanks

leastSquares is the only, strictly, 2nd order accurate scheme in the list!

Your new list:

1. leastSquare
(the rest)

[mwmalkawi]

Thank you Santiago so what comes after if you can state another three that will be great


1. leastSquare
2.
3.
4.


Thanks

[Tobermory]

Sometimes you also crave for stability, of course, esp. if you are having to deal with dirtier meshes, so formal accuracy is not the only metric ...

[Santiago]

Originally Posted by mwmalkawi

Thank you Santiago so what comes after if you can state another three that will be great


1. leastSquare
2.
3.
4.


Thanks

very difficult to know if you dont say over what kind of mesh elements you expect to use the scheme!

[mwmalkawi]

lets say i am using hexahedral as one option and polyhedral as another option so which schemes you would recommend for each starting from higher accuracy to less accuracy thank you again