Summary

If this is something that we want as a proper GridKit option, I think this would require adding a setTimeStep member function for GridKit::Model::Evaluator and its subclasses. If the out parameter is 0, this will indicate to use adaptive steps, otherwise the given time step will be used. In IDA.c there would need to be some minor changes to the integrator and nonlinear solver configuration when using fixed steps as done in https://code.ornl.gov/scidac-oe/fixed-step-ida-demo. I can start a PR if this sounds reasonable.

Rationale

This will be useful for convergence studies and comparisons against adaptive time stepping

Description

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Additional information

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