Posted Sat, 05 Dec 2020 22:31:21 GMT by Juan Navarro
Anybody has experience to use multi-layer well in a model with low permeability (<10-7 m/s)? Do you get simulate the cone of depression? Do you have problmes woth convergence? Our model is extremly slow (it takes a lor of time to converge) and it can´t generate the expected cone...We appreciate any help or idea....
Posted Wed, 09 Dec 2020 09:12:38 GMT by Peter Schätzl Grundwassermodellierer
Extremely high contrasts in conductivity such as the ones introduced by a multi-layer well in low-k material create some difficultiy for the solver. First of all, please check whether you are using SAMG, and - if yes - what the internal error criterion is. This should be small, e.g., 1e-12. Otherwise SAMG may terminate the iteration too quickly, producing somewhat random results. Then, make sure time steps are small during cone development. In case of time-dependent abstraction, smooth changes in rate may also help.

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