I guess that the message comes from the AMG solver. You can try to replace the LinearSolver by the UMFPackBackend to check if it really is a problem with the AMG itself or if there is still something wrong from converting 2p to 3p3c.
Kind regards Bernd -- _______________________________________________________________ Bernd Flemisch phone: +49 711 685 69162 IWS, Universität Stuttgart fax: +49 711 685 60430 Pfaffenwaldring 61 email: be...@iws.uni-stuttgart.de D-70569 Stuttgart url: www.hydrosys.uni-stuttgart.de _______________________________________________________________ ________________________________ Von: Dumux <dumux-boun...@listserv.uni-stuttgart.de> im Auftrag von Kai Wendel <kaiwende...@googlemail.com> Gesendet: Mittwoch, 2. Oktober 2019 11:05:38 An: dumux@listserv.uni-stuttgart.de Betreff: [DuMuX] could not build any aggregates. Probably no connected nodes Hello, by changing the initially 2p problem for geothermal simulation (made by Samuel Scherrer) into a 3p3c problem and running it, the following error messages occured: "Solve: M deltax^k = rCould not build any aggregates. Probably no connected nodes." For more detailed output please look into output.txt. We tried to change the solvers and to simplify the problem, but nothing worked, we do not know, what the problem could be. Does anyone know about something about this message: "Could not build any aggregates. Probably no connected nodes." ? Best wishes, Kai Wendel
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