> > > My open question is, what is meant by time step. I assume that this is > the simulation step number in the ouput of flow.
OK; this is my mental picture of the timeline in an ECLIPSE simulation: X : Report step - given with the DATES or TSTEP kewyord in the Schedule section of the input file. | : A timestep chosen by the adaptive timestep algorithm X-------|------|----|---|--X------|---|----|-----X--------|--------X []( ]( ]( ] 0 1 2 3 This is a simulation with three report steps 1,2 & 3 and in addition there is an initial report step 0 which only contains the initial equilibrium solution. Observe the half open intervals (...] indicated under the timeline, there we see that the results which 'happen' in the timeinterval (R-1,R] are attached to report step R - but the report step 0 is a singularity - spanning the time interval [0,0]. Understanding these intervals is most important when it comes to summary files, where we have results for all simulator timesteps - but they are "attached" to report steps as indicated above. All IO configuration is in terms of report steps, so the comment <https://github.com/OPM/opm-parser/blob/7ef3a7b4c1db3ff99dc5bf5fbb6ee6ce8504c8b7/opm/parser/eclipse/EclipseState/IOConfig/IOConfig.hpp#L38>s you linked to are unfortunately misleading - every single[1] occurence of 'timestep' in the RPTRST configuration should be replaced with REPORT STEP. HTH - Joakim [1]: Of course - there is always an exception, there is a RPTRST setting ( Ithink it is BASIC=6) which will actually get utput for every simulator timestep - that is not supported in flow.
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