[CIG-SHORT] Initial stress cell_data_fields settings and interpolation

[Chunyu Liu (cliu5)]

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).

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<mailto: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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