A problem with ADVECTION modeling

[MichaelZ20]

Hi David!
The attached file that I successfully run two years before now gives the following warning
"WARNING: Cell number for punch is out of range, -100. Request ignored".
What is wrong?

[MichaelZ20]

I have found a reason. The hyphen stopped being applicable in -punch_cells in the ADVECTION block, the comma only. This is not described in the manual.
If all the cells are needed, the line -punch_cells should merely be omitted.
The question is why do we need the ADVECTION at all , when it is possible to set the nil dispersivity in the TRANSPORT block.

[dlparkhurst]

Yes, a bug crept into one of the more recent versions related to ranges ("1-100") for -print_cells and -punch_cells in ADVECTION. You are right, if you want to punch all the cells, simply omit -punch_cells. If you want a selection, then you will have to list the cells one by one. "5 10 15 ...", which is probably too much work except for punching a few cells. 

The bug will be fixed in the next release, but no promises on when that will be.

In the 1995 version, TRANSPORT only allowed advection. In 1999, TRANSPORT was revised to have the full advection-dispersion capabilities, but for backward compatibility (sort of), the original 1995 TRANSPORT was moved to ADVECTION. ADVECTION has few options and can be used to test hypotheses quickly. However, the same calculations can be performed with 0 for dispersivities and 0 for diffusion coefficient in the current TRANSPORT.

[MichaelZ20]

David, thank you for the explanation!