[Ahmed Khattab]

Hi Foamers,

in order to perform a mesh independence study, it is mandatory to use two meshes at least with different spacing, then compare one field or more through the different grids.

my questions is how to get the values of a specific field at a specific point in the two grids specially if the grids are not halved/doubled (ex: h2/h1 =1.5).

thanks,

[bigphil]

Originally Posted by Ahmed Khattab

Hi Foamers,

in order to perform a mesh independence study, it is mandatory to use two meshes at least with different spacing, then compare one field or more through the different grids.

my questions is how to get the values of a specific field at a specific point in the two grids specially if the grids are not halved/doubled (ex: h2/h1 =1.5).

thanks,

The following publication has a useful discussion:
Roache, P, QUANTIFICATION OF UNCERTAINTY IN COMPUTATIONAL FLUID DYNAMICS, Annual Review of Fluid Mechanics, Vol. 29:123-160, 1997, https://doi.org/10.1146/annurev.fluid.29.1.123

You would have to interpolate your field using a method that has at least the same order of accuracy as your solution method (and, I guess, a similar absolute accuracy).