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Will the results of steady state solver and transient solver be same?

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Old   September 26, 2019, 05:01
Question Will the results of steady state solver and transient solver be same?
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Hi, foamers,

I have this question quite a long time ago.
I think the steady state solver will give the same results as the transient solver does.
However, what will it be when a system won't have a steady state but a steady state solver is applied?
will the results not converge? or it will converge but give a non-reasonable result?

I simulated a flow using the steady state chtmultiregion solver, and all the initial residuals go below 1e-6 at last. I also simulated the same case use the transient chtmultiregion solver. However I found the flow pattern is quite different.

here is the simulation domain, on pipe for inlet, one pipe for outlet.


near the bottom surface I made a slice and vector glyph
this is for steady state solver near where the outlet pipe is:
the flow swirls and flows outside.


however, for the result of transient solver,
the flow won't swirl and flows out directly:


the fluid will flow through the domain in about 10s, and I calculated for 25s using the transient solver. The k-e RAS model is applied.

So, does anyone know why the results are different? Does this mean that this flow do not have a steady state?

Thanks!
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