More information about UxDaatset get_dual()

[uturuncoglu]

I wonder how UxDataset get_dual() function is working. My data variables are on nodes and when I use this function it moves data variables from the nodes to elements (faces) but I am not sure what kind of interpolation is used in there. Is it simply doing averaging for the transition from nodes to elements. I could not find more information in the following documentation,

https://uxarray.readthedocs.io/en/latest/generated/uxarray.UxDataset.get_dual.html#uxarray.UxDataset.get_dual

It would be helpful to add more information to there.

[philipc2]

Pinging @aaronzedwick (and @rajeeja ) since he developed the code.

I don't believe any interpolation is currently being done. Data that is stored on nodes ends up shading the faces of the dual grid, and vice-versa.

[aaronzedwick]

Yes, this is correct. The way the dual works is the nodes become the face centers and vice versa. Any data on the nodes in the primal grid will be automatically on the face centers of the dual.

The way it works: to make the dual we connect all the face centers together, creating a new grid where the face centers are now nodes and the nodes are now face centers.

[uturuncoglu]

Maybe there is no any interpolation done in here and just constructing new elements (with node coordinates) on each nodes and directly assign the values since number of nodes in the original data file is same with number of elements when this function is applied.

[uturuncoglu]

Is there any ready to use way to interpolate the data from nodes to elements without doing dual?

[philipc2]

You could use our topological aggregation (specifically mean), which can take a nodal-average.

https://uxarray.readthedocs.io/en/latest/user-guide/topological-aggregations.html

Our remapping functionality could work too

https://uxarray.readthedocs.io/en/stable/user-guide/remapping.html