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Posted Thu, 28 May 2009 14:22:34 GMT by George Kopsiaftis
Hi everybody,  :)

I have some questions about wells. I have a hypothetical unconfined aquifer and I’m trying to determine its response in several pumping scenarios. I have placed a well at the 2nd layer and I noticed that when the pumping rate increased enough (e.g. 500m3/d) some oscillations in hydraulic and some convergence problems occurred. So, my questions are these:

1. Are there any rules to choose the “best” from a numerical point of view layer for pumping? Should I use certain parameter values at the well location to avoid numerical problems?

2. Is it right to place the well at the top slice and use a free and movable surface? If I understood that correctly the BC in this case would follow the free surface up and down movement and the top layer would not fall dry.

Thank you very much for your help,

George
Posted Mon, 15 Jun 2009 15:20:12 GMT by Denim Umeshkumar Anajwala
Dear George,

(1) you have to use a sufficient mesh-resolution (in the order of the well diameter), but also a sufficient resolution in the vertical direction (enough slices). In most cases an automatic time-stepping is adviseable, too.
(2) This is correct. The free-and moveable surface will go down if a well is located on it and not fall dry.

Kind regards
Wolfram
Posted Wed, 17 Jun 2009 08:28:26 GMT by George Kopsiaftis
Thank you very much Wolfram!!!

Your remarks are really helpful....

George

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