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Simulator programs and utilities for automatic differentiation.
15ad669d5d
the missing piece was determining if the wells have changed between
report steps. This patch adds a simple way to determine this, but it
relies on low-level properties of opm-parser it does not
guarantee. (concretely, these details are that the same well objects
are returned in the same order if nothing changes. Since IMO this is a
pretty reasonable assumption, we use this approach instead of a more
complicated one until opm-parser provides a "change determination API"
for wells...)
note that this patch may increase the number of iterations required
for the simulation because the linear system of equations which is
solved in the first iteration of a time step actually corresponds to
the second to last solution of the previous time step. This means that
that linearization recycling usually only works well if the tolerance
of the Newton-Raphson solver is "sufficiently" low. ("sufficiently"
means that the linearization errors made due to using the "wrong"
solution for the first iteration can be neglected compared to the
differences because of the change of the solution in this iteration.)
therefore, use this feature at your own risk...
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