Revision as of 13:37, 16 July 2021 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,379 edits →HPC 2D Timestep ← Older edit		Revision as of 13:38, 16 July 2021 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,379 edits →HPC 2D Timestep Newer edit →
Line 34: * Celerity Control number relates to water depth relative to cell size. Energy can pass through deeper water faster than shallow water, as such deep water will trigger this control. * Diffusion control relates diffusion of momentum relating to the sub grid viscosity. Small cells in deep water will trigger this one. TUFLOW will use the highest timestep possible without exceeding the limits associated with each of the control numbers.<br> The method TUFLOW HPC uses to calculate a timestep and achieve unconditional stability is as follows: * The <font color="blue"><tt>Timestep </tt></font> command included in the TUFLOW Control File (TCF) is only used for the first calculation timestep. The specified value should be consistent with what would be appropriate for a TUFLOW Classic model (i.e. 1/2 to 1/5 the 2D cell size). Internally, TUFLOW HPC divides this value by 10 to apply a value that is suitable for an explicit solution scheme. All subsequent calculations are completed using the adaptive timestep approach outlined in the following bullet points.

HPC Adaptive Timestepping: Difference between revisions