which solvers do you think I can examin and see if they can be used
    instead of SolverCG?


That's the wrong question. If you know that the matrix you have *should be* symmetric and positive definite, but the CG solver does not converge, then you need to debug why the matrix *is not* s.p.d. Using a different solver might allow you to solve the linear system, but since the linear system is apparently not the correct one, the solution will also not be correct.

Best
 W.


--
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Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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