Revision as of 07:01, 18 August 2018 view source Chris Huxley (talk \| contribs) Bureaucrats, Administrators 7,785 edits →Test Case 2 - Discussion ← Older edit		Revision as of 08:00, 18 August 2018 view source Mitch3007 (talk \| contribs) Bureaucrats, Administrators 1,585 edits →Introduction Newer edit →
Line 5: Unfortunately it isn't practical for all models to be designed at an infinitely fine resolution due to the impact it has on simulation speed. Increasing a model resolution will make a simulation run slower. As a rule of thumb, halving the cell size in a model will typically increase the simulation run time by a factor 8. This is due to the number of cells increasing by a factor of (4) four and the necessity for a calculation timestep half that of the larger resolution, translating to (2) twice the number of calculations (4 x 2 = 8). <br> The challenge for modellers is, knowing what resolution is necessary to achieve results that are fit for purpose with sufficient accuracy and having a model that can run within a reasonable time (i.e. hours, not days). <br> <u>[https://tuflow.com/download/Australian_Rainfall_Runoff_Project15_TwoDimensional_Modelling_DraftReport.pdf Australian Rainfall and Runoff Guideline - Two Dimensional Modelling in Urban and Rural Floodplain]</u> provides some recommendations on this topic. It states: <br>

TUFLOW 2D Cell Size Selection: Difference between revisions