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Showing results 1 to 10 of 10 Search took 0.00 seconds. Search: Posts Made By: Shenren_CN

Forum: Main CFD Forum August 14, 2013, 09:16

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN I have very little knowledge about LES. This is a... I have very little knowledge about LES. This is a good introduction for me. I learnt something useful, thanks!

Forum: Main CFD Forum August 14, 2013, 06:49

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN This is interesting to know. So the difference is... This is interesting to know. So the difference is that in RANS/URANS with turbulence modelling, it assumes fluctuation of all scales are modelled, while in LES, the code models only the part of...

Forum: Main CFD Forum August 13, 2013, 12:30

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN This is exactly what I have been looking for.... This is exactly what I have been looking for. Thanks!

Forum: Main CFD Forum August 13, 2013, 12:13

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN Having confirmed that RANS/URANS without modeling... Having confirmed that RANS/URANS without modeling turbulence, if run with small dt, and fine mesh, is identical to DNS. Then back to my original question, would the flow starts to get unsteady if...

Forum: Main CFD Forum August 13, 2013, 12:09

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN I apologize for not having stating clearly that I... I apologize for not having stating clearly that I meant running RANS/URANS without modeling the turbulence, otherwise I would have saved a lot of your time explaining to me. Thanks a lot for the...

Forum: Main CFD Forum August 13, 2013, 11:57

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN What if I run my URANS solver (without turbulence... What if I run my URANS solver (without turbulence modeling, as if running for laminar flow) over a grid having h of the order of the Kolmogorov scale? Does it produce your DNS result? (And at the...

Forum: Main CFD Forum August 13, 2013, 11:35

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN 1) Okay, so you call that URANS... Then, I alter... 1) Okay, so you call that URANS... Then, I alter my question to be: why does not URANS with REALLY REALLY REALLY small time step converge to DNS result? Shouldn't the 'resolved time frequency'...

Forum: Main CFD Forum August 13, 2013, 11:18

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN 1) Why can't I run RANS using a small time step... 1) Why can't I run RANS using a small time step to get an unsteady solution? If your time step is small enough, it shall presumably pick up fluctuation with very small temporal scale. 2) Why not?...

Forum: Main CFD Forum August 13, 2013, 10:54

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN I think if you run your RANS code with very small... I think if you run your RANS code with very small time step and very fine mesh, you are doing DNS. Isn't that the case?

Forum: Main CFD Forum August 13, 2013, 08:31

Replies: 18 Re=5 Mio. Still steady? Views: 1,337 Posted By Shenren_CN Re=5 Mio. Still steady? In this validation example provided by NASA, that runs SA turbulence model RANS on zero pressure gradient flat plate, http://turbmodels.larc.nasa.gov/flatplate_sa.html how come the RANS solver...

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