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What are the four different types of errors?
There are several different factors that combine to affect the overall solution accuracy.
In order of magnitude:
Round-off errors
• Computer is working to a certain numerical precision.
Iteration errors
• Difference between ‘converged’ solution and solution at iteration ‘n’.
Solution errors
• Difference between converged solution on current grid and ‘exact’ solution of model equations.
• ‘Exact’ solution → Solution on infinitely fine grid.
Model errors
• Difference between ‘exact’ solution of model equations and reality (data or analytic solution.