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=HPC Timestep Synchronisation=
HPC usinguses an adaptive timestep doesn'tderived necessarilyfrom synchronisethe hydraulic conditions during a simulation. This time stepping approach creates a situation where the computational timestep does not always align exactly with the specified map and time series result output intervalintervals. InTo suchaccount case,for thethis minimumTUFLOW timestepHPC (dt)makes reporteda intimestep hpc.dt.csvadjustments willto showsynchronize reducedthe computational timestep towith allowoutput forreporting writingtimes. resultsWhen exactlythis atoccurs the mapminimum andtimestep time(dt) seriesreported outputin intervalhpc.dt.csv will report a reduced timestep. This adjustment doesn’t have any effect on the hydraulic calculationcalculations, itand as such, is not reported in the hpc.tlf, neitheror showsshown in the dt map output. The "dtStar" column in the hpc.dt.csv isfile reports the calculated 2D target timestep without any result output synchronisation applied. As such, if the hpc.dt.csv file is being used to quality check the health of a simulation, "dtStar" should be used for the analysis not "dt".<br>
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[[File:dt_synchronising_graph.png]] [[File:dt_synchronising.png|200px]]
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