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Search took 0.00 seconds. Search: Posts Made By: FMDenaro
Forum: Main CFD Forum February 25, 2017, 18:29
Replies: 28
Views: 2,128
Posted By FMDenaro
My idea is that for Re_D not more than 2000 it...

My idea is that for Re_D not more than 2000 it could be still reasonable to set a parabolic profile at the numerical inlet but considering thereafter at least 10-15 diameters of pipe lenght in the...
Forum: Main CFD Forum February 25, 2017, 18:17
Replies: 28
Views: 2,128
Posted By FMDenaro
Yes but the theory assumes the Re_D for a pipe...

Yes but the theory assumes the Re_D for a pipe developing infinitly downward... Conversely, You should consider here a pipe ending at a certain x due to the expansion that changes the pressure...
Forum: Main CFD Forum February 25, 2017, 17:56
Replies: 28
Views: 2,128
Posted By FMDenaro
Increasing the diameter after expansion theRe...

Increasing the diameter after expansion theRe number increases ....
Forum: Main CFD Forum February 25, 2017, 17:47
Replies: 28
Views: 2,128
Posted By FMDenaro
Could you post a link to such paper?

Could you post a link to such paper?
Forum: Main CFD Forum February 25, 2017, 17:18
Replies: 28
Views: 2,128
Posted By FMDenaro
No, I just assume by a physical point of view...

No, I just assume by a physical point of view that the flow motion in a long pipe is developing a turbulent profile at a certain Re_x. Turbulence is the common nature of the flow in channels and...
Forum: Main CFD Forum February 25, 2017, 16:10
Replies: 28
Views: 2,128
Posted By FMDenaro
I do not agree....why? Think a similar flow, the...

I do not agree....why? Think a similar flow, the backward facing step with a small height. If you set a laminar profile the onset of turbulence from the expansion will be different from that you...
Forum: Main CFD Forum February 25, 2017, 13:51
Replies: 28
Views: 2,128
Posted By FMDenaro
Not at all ... the Re_x value for a long pipe...

Not at all ... the Re_x value for a long pipe says you get a turbulent profile that, in a DNS formulation, means you have to set a 3D unsteady inflow
Forum: Main CFD Forum February 25, 2017, 13:07
Replies: 28
Views: 2,128
Posted By FMDenaro
diggee, I do not agree with you, many of your...

diggee,
I do not agree with you, many of your assumptions are not based on a real assessment...I don't know what paper are you following and I cannot judge that. But for sure, you are going to...
Forum: Main CFD Forum February 25, 2017, 03:36
Replies: 28
Views: 2,128
Posted By FMDenaro
yes, I agree, statistics are the only way to...

yes, I agree, statistics are the only way to assess the quality of the DNS/LES solution...but maybe LuckyTran was considering the fact that during the numerical transient stastistics are not...
Forum: Main CFD Forum February 24, 2017, 09:50
Replies: 28
Views: 2,128
Posted By FMDenaro
I haven't read the paper describing this problem....

I haven't read the paper describing this problem. However, let me say that is not clear to me a "local turbulence" that travels... I can imagine mass, momentum and energy as transported variables...
Forum: Main CFD Forum February 24, 2017, 03:32
Replies: 28
Views: 2,128
Posted By FMDenaro
No, you can't. Then, even when you get a...

No, you can't. Then, even when you get a developed flow you still need to run the solution further to sample the field for the statistics.
I suggest to control the time evolution of the total...
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