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Showing results 1 to 9 of 9 Search took 0.00 seconds. Search: Posts Made By: FMDenaro

Forum: Main CFD Forum August 14, 2013, 06:56

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro that's correct, but only for LES with implicit... that's correct, but only for LES with implicit filtering. Conversely, using explicit filtering the filter width is taken fixed, independently from the computational step which can also tends to...

Forum: Main CFD Forum August 13, 2013, 12:28

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro if you solve in DNS the flow over a flat plate... if you solve in DNS the flow over a flat plate you will see a small steady 2D laminar region, then the transition region wherein the flow develops its unsteady nature until a full developed...

Forum: Main CFD Forum August 13, 2013, 12:14

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro that's ok now, a advantage of using LES codes... that's ok now, a advantage of using LES codes (with implicit filtering) is that the solution automatically tends towards the DNS for vanishing computational steps, without entering into code to...

Forum: Main CFD Forum August 13, 2013, 12:04

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro yes, if you eliminate from your URANS code all... yes, if you eliminate from your URANS code all the turbulence models and use dt and h to resolve all scales, you will get a DNS solution.

Forum: Main CFD Forum August 13, 2013, 11:44

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro http://www.os-cfd.ru/cfd_docs/chalmers/urans.pdf?P... http://www.os-cfd.ru/cfd_docs/chalmers/urans.pdf?PHPSESSID=e16a72bf68c8e833e522b3120bd6ee4b

Forum: Main CFD Forum August 13, 2013, 11:41

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro in URANS you can also try using a very small time... in URANS you can also try using a very small time step but the variable you solve is always a statistical variable <f>. That means that even for dt->0 the contribution of the turbulence model will...

Forum: Main CFD Forum August 13, 2013, 11:25

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro The RANS equations are steady by definition, no... The RANS equations are steady by definition, no time-derivative exists, there is no time-step. The URANS formulation is a special version of the RANS wherein the time derivative exists but the...

Forum: Main CFD Forum August 13, 2013, 10:58

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro No, never... first, in RANS you do not solve a... No, never... first, in RANS you do not solve a time marching formulation but only for a steady state. Then, even if h->0 the RANS model will never give a vanishing contribution so to tend towards the...

Forum: Main CFD Forum August 13, 2013, 10:20

Replies: 18 Re=5 Mio. Still steady? Views: 1,348 Posted By FMDenaro From your question I suppose you are not familiar... From your question I suppose you are not familiar with RANS/URANS/LES/DNS formulations... The RANS equation are obtained from the DNS ones by applying the Reynolds average, which implies a...

Showing results 1 to 9 of 9

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