HPC Model Review: Difference between revisions

= Control Number Factor Sensitivity Testing =

Sensitivity run can be done by reducing timestepping interval using Control Number Factor == 0.8. This reduces the timestep (as dictated by the three control numbers) by the factor 0.8, making the simulation to take roughly 20% longer. If comparing the two results shows negligible differences it is a strong indicator the default control number limits may be considered satisfactory. If there are unacceptable measurable differences, the location of these impacts may also help to spatially identify where the solution may have been struggling at the default control numbers. These areas can then be inspected for input topography or boundary conditions errors. Models shouldn’t need to have the CNF lowered any more than this, as if they do, it would indicate there is more likely an underlying model configuration issue that needs attention.