Revision as of 16:33, 28 January 2021 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,343 edits →Why is my HPC model getting unstable right at the beginning? And why are my control numbers lower than they could be? ← Older edit		Revision as of 13:31, 29 January 2021 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,343 edits →Why is my HPC model getting unstable right at the beginning? And why are my control numbers lower than they could be? Newer edit →
Line 93: * Specify initial water level for the whole model with "Set IWL" command or locally with "Read GIS IWL" command. The wet cells can limit the adaptive timestep through the [[HPC_Adaptive_Timestepping#HPC_2D_Timestep \| Shallow Wave Celerity Number]], and prevent the HPC solver from using big timesteps. * Use "Timestep Maximum" command to cap the maximum timestep to not get too high. <br> = Should I expect zero mass error for TUFLOW HPC models? = HPC solver uses a finite volume scheme which is volume conservative and shouldn't produce any mass error for 2D only models. Mass error can still occur when coupling HPC with the ESTRY engine that isn't volume conservative. The cause could be 1D structures, 1D/2D linking or 1D/2D timestep synchronisation. Where there is not a one to one synchronisation of the 1D and 2D timesteps, mass error may occur due to the interpolation of the 1D/2D boundary values over time.<br> <br>

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