Hi Giulio,
Thanks for your interest.
There are multiple suggestions in literature for selection of ac-zeta. I
suggest using ac-zeta=3*Umax, where Umax is approximately the maximum
local velocity magnitude in the domain. Selection of ac-zeta shouldn't
have big effect on the results but it can considerably affect the
convergence rates.
Turbulence at high Re is highly three dimensional and hence cannot be
resolved in 2D. That may be one of the reasons for the result mismatch.
Cheers,
Niki
On 22/01/20 15:20, Giulio Ortali wrote:
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Hello everyone,
I am still running the case I was mentioning in the last 2 post on
this mailing list, i.e. high reynolds (3e6) 2D incompressible flow
over the ls417.
I have problems since the results, in particular the k coming out of
the results, are quite different from the one computed using the RANS,
almost two orders of magnitude higher.
I was thinking about the possible reasons for this and I was thinking
that maybe using a ac-zeta lower than the standard 2.5 would give
different results, maybe similar to the RANS. Could this be the case?
What is the rationale behing the choice of zeta? I understood that
lower zeta bring to "more incompressible" flows, but what are the
downsides of chosing a low zeta? Also, what could be other trials to
do in order to obtain k similar to the RANS?
I attach the ini file and the mesh.
Thank you in advance,
Giulio
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