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Notes on Convergence

before evaluating results the solution has to be perfectly converged

always make sure the solution is fully converged

residuals and probes at locations are useful to plot during the simulation

probes are set via function object in controlDict

the graph is plotted with simple script in gnuplot

meshes having high aspect ratio cells (very thin cells) typically converge slowly in pressure. This is why with every finer mesh (perhaps higher aspect ratio) we also need to test how many iteration are needed to fully converge

Figure: The residual convergence example. (Pressure may have different number of points, because of the number of nonOrthogonalCorrectors, which is the number of how many times is pressure recomputed)

Figure: The velocity magnitude convergence in certain selected points.

Figure: The pressure convergence in certain selected points.