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Using steady state for Transient Initialization

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Old   September 13, 2019, 22:44
Default Using steady state for Transient Initialization
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Soumitra Vadnerkar
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How will the convergence of steady state simulation of a problem will affect its transient simulation if used for initialization?
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Old   September 14, 2019, 04:59
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Paolo Lampitella
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Too vague.

In general, if you plan to use the same turbulence modeling approach in both steady and unsteady (laminar/DNS or RANS/URANS) then, if the steady solution makes any sense, you don't need the unsteady one.

If using RANS to initialize LES/DNS, you probably want almost converged mass fluxes and a good enough distribution of the turbulent quantities used to initialize the fluctuations
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Last edited by sbaffini; September 14, 2019 at 07:09.
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Old   September 14, 2019, 05:02
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Filippo Maria Denaro
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Paolo addressed the main issues.

Just to add that if you have a steady flow problem and you run a transient formulation starting from the initial steady numerical solution, you should find the code stops immediately as it reached the correct solution.
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