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I am trying to solve a MINLP and I use Pyomo and Spyder. I am looking for a free global solver for many variables and constraints and it should be matched with Pyomo. Baron is a global solver but it needs license for more than 10 variables and 10 constraints. I used Knitro solver but it is a local solver and it was stuck in local optimum. Which solver do you recommend?

hamta
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    [Couenne](https://projects.coin-or.org/Couenne) But don't expect magic for *many variables and constraints*. – sascha Apr 19 '20 at 14:29
  • @sascha I used Couenne but the result is not global optimum!! Is it possible that the result of a global server don't be a global optimum?!! – hamta Apr 19 '20 at 18:00

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