A small angle lead to faster convergence at the expense of numerical stability. Default value is 0.7. This option is only available for the IDRS solver which is part of the unsupported Eigen modules that are available through OGS_USE_EIGEN_UNSUPPORTED CMake option.

See following links for detail description:

"Detailed Description" in https://libeigen.gitlab.io/docs/unsupported/

Additional info

From MathLib/LinAlg/Eigen/LinearSolverOptionsParser.cpp line 124

This is an optional parameter.
Data type: int
Expanded tag path: linear_solvers.linear_solver.eigen.angle
Go to source code: → ogs/ogs/master

Used in the following test data files

Used in no end-to-end test cases.