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Showing results 1 to 17 of 17 Search took 0.00 seconds. Search: Posts Made By: FMDenaro

Forum: Main CFD Forum January 21, 2014, 15:40

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro more details about the state-of-the-art in LES... more details about the state-of-the-art in LES can be found in http://meetings.aps.org/Meeting/DFD13/sessionindex2

Forum: Main CFD Forum January 21, 2014, 14:54

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro From my experience, people working in the... From my experience, people working in the industrial field consider LES as a more accurate turbulence modelling than RANS, but then are frustrated while discovering the computational cost for...

Forum: Main CFD Forum January 17, 2014, 12:13

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro Hi, what are you asking for is something that is... Hi, what are you asking for is something that is only possible in the academic site...attending CFD and turbulence courses is necessary and have a practice with other students is very helpful. I...

Forum: Main CFD Forum December 5, 2012, 08:11

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro from my experience, I agree that dynamic mixed... from my experience, I agree that dynamic mixed model is superior, in order to use on non regular grids (e.g. unstructured) the LES procedure must be properly written. As far the grid resolution is...

Forum: Main CFD Forum November 28, 2012, 11:36

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro ok, but this is just the theory... - the... ok, but this is just the theory... - the filter process is never applied in practical LES (apart the explicit filtering approach). Filtering is only an implicit process due to discretization of...

Forum: Main CFD Forum November 21, 2012, 16:33

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro Just to address an issue ... if someone sees the... Just to address an issue ... if someone sees the continuous URANS equations and compare to the LES equations (for implicit filter) he would for sure wonder what about the difference ... The answer is...

Forum: Main CFD Forum November 21, 2012, 11:30

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro I believe that RANS solution are statistical in... I believe that RANS solution are statistical in global sense, often they fail in providing correct (statistical) results only because the model is not perfect to take into account the fluctuations...

Forum: Main CFD Forum November 21, 2012, 04:10

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro Hi Martin, first I am curious to know what do... Hi Martin, first I am curious to know what do you expect from RANS in your case... Any computed variable is statistical, that means you have a function like <f>(x) therefore, in your opinion, in...

Forum: Main CFD Forum November 18, 2012, 18:03

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro No, I wanted to say "model", not "recover"...... No, I wanted to say "model", not "recover"... recovering outside the Nyquist freqeuncy is impossible as you correctly said. Therefore, modelling all means modelling physical unresolved scale as...

Forum: Main CFD Forum November 17, 2012, 17:56

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro I agree that the eddy viscosity assumption... I agree that the eddy viscosity assumption suffers of many limitations. However, non-isotropic eddy viscosity SGS provides somehow disappointing results, as well ... In my experience the...

Forum: Main CFD Forum November 17, 2012, 12:21

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro I agree :) I think that a cfd user must be... I agree :) I think that a cfd user must be aware of the fact the running any numerical simulation will allways produce an intrinsic filtering. The "label" of the simulation can be DNS or LES...

Forum: Main CFD Forum November 17, 2012, 05:35

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro good ! just to stimulate the discussion, I... good ! just to stimulate the discussion, I do a simple example... consider the "academic" test-case of the lid-drive cavity at Re=1000. It is a laminar case. Then you run your code as it is on a...

Forum: Main CFD Forum November 13, 2012, 12:58

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro Does LES is useful only if RANS/URANS fails or... Does LES is useful only if RANS/URANS fails or you really need as much details as LES can provide?

Forum: Main CFD Forum November 10, 2012, 17:51

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro no.... in LES you do not have the statistical... no.... in LES you do not have the statistical meaning of the solution at time t as the average of N sample... Indeed, in LES you have to simulate the N sample and explicitly do the average. LES...

Forum: Main CFD Forum November 10, 2012, 17:42

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro Just think of these two philosophies: LES ... Just think of these two philosophies: LES -> filter G(x-x'; Delta_x) URANS -> filter G(t-t'; Delta_t) Actually, an example would be useful, the cycle of a piston in engine. RANS will set a...

Forum: Main CFD Forum November 9, 2012, 11:27

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro what "better" means for you? does LES should be... what "better" means for you? does LES should be just "different" from RANS?

Forum: Main CFD Forum November 9, 2012, 05:51

Replies: 42 What LES should do for you? Views: 6,095 Posted By FMDenaro What LES should do for you? I often read people writing about using "LES turbulence model", therefore I open this post since I am curious about your ideas of what LES is and what LES should do for you. You are also probably...

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