Keyword Analysis & Research: steady state cfd

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Frequently Asked Questions

What is a steady-state membrane CFD simulation?

Steady-State Membrane CFD SimulationPressure contours on both sides of a membrane For a steady-state simulation the residuals and force profile should be something similar to those in the tutorial "Flow Over a Double-Sided Membrane".

Is an unsteady flow simulation necessary for a steady state model?

If you run a steady-state simulation for an unsteady flow then you will get poor results, but as I just pointed out there is usually a good indication from the steady-state results that an unsteady simulation was necessary.

What is wrong with my CFD simulation?

Something is also wrong, as expected, with the residuals. For a steady-state simulation you should see all residuals reduce relatively smoothly toward or below 1e-3 with increasing iterations. Steady-State Membrane CFD SimulationPressure contours on both sides of a membrane

How to tell if flow is stable or unsteady?

If you see persistent oscillations in the residuals plot (solver diagnostics) and/or oscillations in a key monitor, such as a drag force monitor, with increasing iterations then that's a good indicator the flow may be unsteady (transient) and the simulation needs to be run as an unsteady simulation.


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