Basic question: what is the correspondence between cell ID's and grid positions?

[Alejandro Fernández]

Dear all,

I am starting with PFLOTRAN and trying to run some first 2-D example simulations of flow and transport. I want to enter a heterogeneous permeability distribution and I see that there are two input methods: cell_indexed mode, and gridded mode. If I go for the cell_indexed mode, I wonder what is the correspondence between cell ID's and grid positions? Also, for the future, I wonder where I can find these type of basic information/questions?

Thanks a lot in advance.

Cheers,

Alejandro

[Kris Kuhlman]

It counts up in x, then y, then z.

You can also add NATUAL_ID to the output block, and it will write cell ids in the HDF5 output, which you can look at using paraview.

Kris

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[Kris Kuhlman]

NATURAL_ID (typo)

[Alejandro Fernández]

Thank you!

I will look into that.

Cheers,

Alejandro

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Ph.D. Alejandro Fernandez Visentini

[Hammond, Glenn E]

Alejandro,

 

To add to what Kris stated….

 

For structured grids:

 

natural_id = i + (j-1)*nx + (k-1)*nx*ny

 

If the grid spacing is irregular in x, y or z, it becomes more challenging to predict the location of cell centers, but the numbering is identical.

 

For unstructured grids:

 

There is no formula. You need a third-party preprocessing tool to generate the grid and map the values for cell indexed datasets. PFLOTRAN will map the values for gridded datasets.

 

Glenn

 

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[Alejandro Fernández]

Dear Glenn,

Thank you for your addition, I will continue working on this!

Cheers,

Alejandro

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