The relative tolerance being applied to the norm of the whole residuum vector.

The relative error \(e\) is computed as

\[e = \frac{||r||}{||r_0||+\epsilon},\]

where \(r\) and \(r_0\) are the residuum and the residuum from computed in the first iteration, respectively, and \(\epsilon\) is the machine epsilon guaranteeing that the denominator is always nonzero.

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Additional info

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From NumLib/ODESolver/ConvergenceCriterionResidual.cpp line 103

- This is an optional parameter.
- Data type:
`double`

- Expanded tag path: time_loop.processes.process.convergence_criterion.Residual.reltol
- Go to source code: → ogs/ogs/master

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Used in the following test data files

Used in no end-to-end test cases.