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Search took 0.00 seconds. Search: Posts Made By: FMDenaro
Forum: Main CFD Forum October 10, 2013, 07:12
Replies: 16
Views: 2,400
Posted By FMDenaro
Ok, I think that this problem should be better...

Ok, I think that this problem should be better solved by URANS/DES models ...
Forum: Main CFD Forum October 10, 2013, 07:09
Replies: 16
Views: 2,400
Posted By FMDenaro
yes, correct. Be careful to run first the URANS...

yes, correct. Be careful to run first the URANS for a sufficient time to cancel the initial numerical transient, then storing a meaningful number of fields to perform the statistical averaging.
Forum: Main CFD Forum October 10, 2013, 06:54
Replies: 16
Views: 2,400
Posted By FMDenaro
The pointwise solution is surely unsteady due to...

The pointwise solution is surely unsteady due to turbulence but the problem is to assess if your problem admits a statistically steady state to use RANS or has a statistically unsteady stato to use...
Forum: Main CFD Forum October 10, 2013, 06:34
Replies: 16
Views: 2,400
Posted By FMDenaro
your residuals clearly show that the solution...

your residuals clearly show that the solution will not converge towards a steady state. But, as I don't know details of your flow problem, I can not say if that indicates an unsteady solution or...
Forum: Main CFD Forum October 9, 2013, 16:18
Replies: 16
Views: 2,400
Posted By FMDenaro
yes, I agree that reaching a numerically steady...

yes, I agree that reaching a numerically steady solution does not mean that is accurate and physically relevant, it only means that the discrete system admits a steady solution. However, it is...
Forum: Main CFD Forum October 9, 2013, 11:37
Replies: 16
Views: 2,400
Posted By FMDenaro
If density, momentum, energy go to a steady state...

If density, momentum, energy go to a steady state any other derived quantity will be steady (drag, lift). Generally, a non-steady state of the flow will produce oscillating residuals. When the...
Forum: Main CFD Forum October 9, 2013, 11:11
Replies: 16
Views: 2,400
Posted By FMDenaro
If the case admits no steady solution, a steady...

If the case admits no steady solution, a steady solver would simply not converge because the residual has a physical meaning that is the time-dependent part that balances all the fluxes.
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