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Why run the solver twice ("cavity" tutorial section

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Old   February 27, 2012, 12:15
Default Why run the solver twice ("cavity" tutorial section
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In section " Running the code" of the first cavity tutorial on OpenFOAM the user should increase the simulation time and rerun the solver. When I postprocess the flow in ParaView it looks the same and nothing changes except the Courant number (rises from ~0.2 to ~0.6 because of the time-step). Why do I need to run the solver again?
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