> I don't know why, when using a small time step, I get oscillations. The smaller the time step the larger the oscillations. I would have thought, due to the Courant conditions, the results would be more precise with a smaller time steps. I think it is because you are using centered in space. I'm not expert on error analysis of numerical methods for finite difference, but I think centered in space can lead to oscillations. I almost always use -space 0; -time 1 to avoid this possibility. If you want to know more, I can ask Ken Kipp to give us a thorough explanation. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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