HPC Adaptive Timestepping: Difference between revisions

HPC uses an adaptive timestep derived from the 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 intervals. To account for this TUFLOW HPC makes a timestep adjustments to synchronize the computational timestep with output reporting times. When this occurs the minimum timestep (dt) reported in hpc.dt.csv will report a reduced timestep. This adjustment doesn’t have any effect on the hydraulic calculations, and as such, is not reported in the hpc.tlf or shown in the dt map output. The "dtStar" column in the hpc.dt.csv file reports the calculated 2D target timestep without any result output synchronisation applied. As such, ifIf 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>