[petsc-users] GAMG and near-null-space when applying Dirichlet Conditions

Manav Bhatia bhatiamanav at gmail.com
Wed Feb 24 09:45:09 CST 2016


    I typically apply Dirichlet BCs by modifying the Jacobin and rhs: zero constrained rows of matrix with 1.0 at diagonal, and zero corresponding rows of rhs. 

    While using GAMG, is it still recommended to provide the near-null space (given that the zero-eigenvalues have been removed by specification of DIrichlet BCs)?

    If that information is still needed, should the vectors be modified in any manner to be consistent with the Dirichlet BCs? 


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