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= HPC TUFLOW Log File (*hpc.tlf) =
The .hpc.tlf log file records the model timestep, control numbers and volume of water in model at each timestep as shown below. It also shows repeated timesteps if the [[HPC_Adaptive_Timestepping | control number limits]] were exceeded or there is a significant change in control numbers (more than 20%). It is inevitable to have repeated timesteps, if a model has a sudden change in rainfall input from one timestep to the next, or has a warmup period with small flow rate before a large inflow. However, if there is a high occurrence of repeating timesteps when the boundary inflows are smooth, this could be an indicator of model instability. The total number of repeated timesteps is also recorded in Simulation Summary of the .tlf file.<br>
'''Note:''' TUFLOW HPC allows the [[HPC_Adaptive_Timestepping | control numbers]] to be breached by 20%. The timestep will not be repeated with Nc, Nu smaller than 1.2 and Nd smaller than 0.36. <br>
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