[CIG-SHORT] Initial stress cell_data_fields settings and interpolation

[Matthew Knepley]

On Wed, Nov 11, 2015 at 10:42 AM, Chunyu Liu (cliu5) <cliu5 at memphis.edu>
wrote:

> Hi,
>
> When I do 3D linear interpolation for initial stress, It always shows that
> :
> Could not find initial stress at (  100270  116887  -36173.7) in material
>
> But, my initial stress domain is bigger than my mesh domain.Generally, it
> should work.
> If the initial stress domain is bigger and is linearly interpolated, it
> should include this point( 100270,116887,-36173.7).
>

You need to include your spatial database so that we know what is in it.

  Thanks,

    Matt


> It works when I use 2D dimension data or use nearest interpolation.
>
> Does this mean the linear interpolation interval is not small enough?
> I should modify that linear interpolation source file, right?
>
> Appreciate for any ideas and suggestions.
>
> Thank you
>
>
> On Nov 9, 2015, at 10:08, Brad Aagaard <baagaard at usgs.gov> wrote:
>
> On 11/9/15 7:29 AM, Chunyu Liu (cliu5) wrote:
>
> Hi Brad,
> Thank you for replying.
> Actually my initial stress data dimension is 3.
> When I change data-dim=3 and use linear interpolation, it works on
> SimpleGridDB but not in SimpleDB.
> However, SimpleDB works by using nearest interpolation.
> Any idea about it ?
>
>
> Nearest interpolation just uses the nearest point. If the grid has the
> same resolution as the mesh, then this works fine. If your grid is at a
> coarser resolution than the mesh and your data is on a grid, then use
> SimpleGridDB as the interpolation algorithm is much more efficient.
>
> SimpleDB in 3-D assumes a cloud of points and forms tetrahedra to do the
> interpolation, so it can give funny results for gridded data with large
> spatial variations.
>
> Regards,
> Brad
>
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