HPC FAQ: Difference between revisions
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The below suggestions can be implemented to eliminate the instability and/or the decrease in control numbers:
* Specify initial water level for the whole model with <font color="blue"><tt>Set IWL</tt></font> command or locally with <font color="blue"><tt>Read GIS IWL</tt></font> command. The wet cells can limit the adaptive timestep through the <u>[[HPC_Adaptive_Timestepping#HPC_2D_Timestep | Shallow Wave Celerity Number]]</u>, and prevent the HPC solver from using big timesteps.
* Use <font color="blue"><tt>Timestep Maximum</tt></font> command to cap the maximum timestep to not get too high. A good Timestep Maximum value to start with might be a half the cell size in metres, e.g. if the cell size is 5m, the Timestep Maximum is to be 2.5 seconds. The .hpc.tlf file can be checked of further refinement is needed.
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