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Line 165: * A factor 2.0 increase in model resolution (eg. increasing the resolution from 30ft to 15ft) will increase the simulation time by a factor of 8.0. * A factor 3.0 increase in model resolution (eg. increasing the resolution from 30ft to 10ft) will increase the simulation time by a factor of 16.0. This relationship is due to doubling the resolution (halving the cell size) increasing the number of cells by a factor (4) four and requiring half the ~~time step~~timestep to maintain stability (i.e. 2 two times the number of calculations) (4x2=8). The ratios for this test case don't match the above generalised trend exactly, though are close enough to be useful when optimising the cell size to meet project requirements.<br> ~~The ratios for this test case don't match the above generalised trend exactly, though are close enough to be useful when optimising the cell size to meet project requirements.<br>~~ [[File:Mesh Converge Direct Rainfall Simulation Time Factor.png\|700px]]

TUFLOW 2D Cell Size Selection: Difference between revisions