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Search took 0.00 seconds. Search: Posts Made By: FMDenaro
Forum: Main CFD Forum May 10, 2018, 10:58
Replies: 22
Views: 3,226
Posted By FMDenaro
Not sure about what you are doing but if you are...

Not sure about what you are doing but if you are prescribing a constant temperature that means you let the heat flux to asses from the solution. Therefore you can have part of the region having heat...
Forum: Main CFD Forum May 7, 2018, 13:24
Replies: 22
Views: 3,226
Posted By FMDenaro
Well I strongly advice the use of the integral of...

Well I strongly advice the use of the integral of the kinetic energy into the whole domain. In a statistically steady state, you should have a balance between production and dissipation. Therefore,...
Forum: Main CFD Forum May 7, 2018, 12:08
Replies: 22
Views: 3,226
Posted By FMDenaro
Generally, if you have un unsteady solution in...

Generally, if you have un unsteady solution in deterministic sense, it is fundamental to prescribe the correct and physical initial and (unsteady) Bc.s. For example that is fundamental if you are...
Forum: Main CFD Forum May 5, 2018, 03:25
Replies: 22
Views: 3,226
Posted By FMDenaro
You are largely confusing the physical...

You are largely confusing the physical instantaneous aspect of the vortex shedding (that you can simulate using DNS or LES) from the appearence of the statistically averaged solution (that you...
Forum: Main CFD Forum May 4, 2018, 16:24
Replies: 22
Views: 3,226
Posted By FMDenaro
I suggest a reading of the introduction ...

I suggest a reading of the introduction
https://www.researchgate.net/publication/267547505_ON_URANS_SOLUTIONS_WITH_LES-LIKE_BEHAVIOUR
Forum: Main CFD Forum May 4, 2018, 16:16
Replies: 22
Views: 3,226
Posted By FMDenaro
Again, you formally can use any type of initial...

Again, you formally can use any type of initial condition for the unsteady solver, that is correct. But that means nothing in terms of the final solution if you are not assessing what are you...
Forum: Main CFD Forum May 4, 2018, 15:14
Replies: 22
Views: 3,226
Posted By FMDenaro
Unsteady available for performing URANS (aparto...

Unsteady available for performing URANS (aparto from DNS and LES). In such formulation, the unsteady character is due to an external driving force like a periodic motion of a piston or unsteady BC.s....
Forum: Main CFD Forum May 4, 2018, 14:50
Replies: 22
Views: 3,226
Posted By FMDenaro
Not at all. You are confusing the physical...

Not at all. You are confusing the physical appearence of the vortex shedding in the pointwise unsteady solution of the NS equation with the statistically averaged solution. In RANS any type of...
Forum: Main CFD Forum May 4, 2018, 13:02
Replies: 22
Views: 3,226
Posted By FMDenaro
The flow is for sure unsteady in deterministic...

The flow is for sure unsteady in deterministic sense but if you do not add a cylinder oscillations or other unsteady setting in the BC.s, you can solve the statistically steady equations that...
Forum: Main CFD Forum May 4, 2018, 12:33
Replies: 22
Views: 3,226
Posted By FMDenaro
The key is to understand if your problem admits...

The key is to understand if your problem admits or not a physical steady (in statistical meaning) state. For example, a in-cylinder turbulent flow with a cyclic piston movement has no steady state....
Forum: Main CFD Forum May 4, 2018, 11:20
Replies: 22
Views: 3,226
Posted By FMDenaro
No, you need to assess the type of flow problem...

No, you need to assess the type of flow problem you are solving.
If the problem is laminar, say for example a 2D flow around a cylinder at Re=100 it will not converge to a steady state because the...
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