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Although the initialised problem is symmetric, the solution becomes asymmetric as time passes, why?

April 26, 2017asymmetric initialised passes problem solution Symmetric time

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Although the initialised problem is symmetric, the solution becomes asymmetric as time passes, why?

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The code is indeed not perfectly numerically symmetrical. This is due mainly to the tolerance in the solution for the pressure equation, if you decrease the tolerance you should see smaller asymmetries.