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Search: Posts Made By: sbaffini
Forum: Main CFD Forum Today, 04:38
Replies: 6
Views: 104
Posted By sbaffini
Dear arjun, that's also a point. Also, for...

Dear arjun,

that's also a point. Also, for very obvious reasons, i can imagine several details to be missing from their papers. Still, i find hilarious that works made after those simply refer to...
Forum: Main CFD Forum Today, 04:23
Replies: 6
Views: 104
Posted By sbaffini
Dear Filippo, i guess that it probably went...

Dear Filippo,

i guess that it probably went unnoticed, due to the long post, but i actually have a working code. However, if you delve into the details of the formulation, you will see that, to...
Forum: Main CFD Forum Yesterday, 05:04
Replies: 9
Views: 103
Posted By sbaffini
The way to proceed is always to shrink the...

The way to proceed is always to shrink the problem down to a minimum (not) working example. This is important because you cannot exclude a compiler error (even if it's extremely rare).
Forum: Main CFD Forum September 24, 2016, 10:44
Replies: 6
Views: 104
Posted By sbaffini
Weiss & Smith Preconditioned Density Based Solver, Algebraic Multigrid, etc.

Dear all,

This is going to be a very long post. I might have splitted it in more parts, but that didn't look like the best strategy neither, after all. So, sorry about that.

I'm working on the...
Forum: FLUENT September 8, 2016, 12:31
Replies: 4
Views: 165
Posted By sbaffini
The Fluent manual is the primary source to know...

The Fluent manual is the primary source to know that you can use Fluent with journal files and to actually do that.

After that you should realize that the journal commands exactly fit the Fluent...
Forum: FLUENT September 8, 2016, 07:14
Replies: 4
Views: 165
Posted By sbaffini
My usual approach is to use a scripting language...

My usual approach is to use a scripting language (say, octave/MATLAB) to produce a journal which will achieve that.

Still, this is the wrong forum to ask. A dedicated Fluent one exists.
Forum: Main CFD Forum September 8, 2016, 06:34
Replies: 35
Views: 642
Posted By sbaffini
That should not happen with the method of lines...

That should not happen with the method of lines and the same should apply also for the time splitting which, if i am not wrong, is not practically different from a segregated approach.
Forum: Main CFD Forum September 8, 2016, 06:16
Replies: 35
Views: 642
Posted By sbaffini
Still, unless there is some specificity regarding...

Still, unless there is some specificity regarding chemical source terms, as he intend to just reach the steady state, i guess such effort on the time acuracy is not actually worth it. He jest needs...
Forum: Main CFD Forum September 7, 2016, 15:56
Replies: 35
Views: 642
Posted By sbaffini
Typically, for non linear coupled equations you...

Typically, for non linear coupled equations you still need the jacobian to determine the maximum allowable time step. For each equation you get the maximum absolute eigenvalue of the jacobian and the...
Forum: Main CFD Forum September 7, 2016, 05:04
Replies: 35
Views: 642
Posted By sbaffini
Well, glad to know that i could manage to help...

Well, glad to know that i could manage to help you.

I got my Ph.D. from POLIMI and, while we never actually worked together, i met a couple of times with both Prof. Faravelli and Prof. Cuoci for...
Forum: Main CFD Forum September 7, 2016, 04:01
Replies: 35
Views: 642
Posted By sbaffini
Dear Tobias, now i am more confident about...

Dear Tobias,

now i am more confident about what we are talking about. You probably know more than me but, have you given a look at these:
...
Forum: Main CFD Forum September 6, 2016, 11:17
Replies: 35
Views: 642
Posted By sbaffini
Maybe it's just me misunderstanding (in this...

Maybe it's just me misunderstanding (in this case, sorry) but, do you refer to the flamelet library pre-computation or to the actual resolution of the flamelet equation?

If, as i got it, it is the...
Forum: Main CFD Forum September 5, 2016, 08:57
Replies: 10
Views: 203
Posted By sbaffini
Your question: Each of the definitions...

Your question:



Each of the definitions you quoted has a different length scale only.

Than my answer was:

"According to the way you perform the discretization, different discrete spatial...
Forum: Main CFD Forum September 4, 2016, 10:21
Replies: 10
Views: 203
Posted By sbaffini
Well, a possible answer is: because it really is...

Well, a possible answer is: because it really is a matter of definition. When you discretize a physical equation, the same non dimensional numbers show up also in their discrete counterpart....
Forum: Main CFD Forum August 23, 2016, 04:45
Replies: 3
Views: 155
Posted By sbaffini
I try to add a more practical perspective to the...

I try to add a more practical perspective to the previous correct answers.

The feasibility of a boundary condition is just dependent from the final solution. In the specific case of symmetry, it...
Forum: Main CFD Forum August 22, 2016, 10:19
Replies: 12
Views: 713
Posted By sbaffini
I have to say that, as someone who is paid to...

I have to say that, as someone who is paid to introduce features in a Fortran based CFD code, my point of view is clearly biased. But, honestly, the other possible point of view, the one of a...
Forum: Main CFD Forum August 18, 2016, 10:08
Replies: 7
Views: 301
Posted By sbaffini
You may want to consult Blazek, Computational...

You may want to consult Blazek, Computational Fluid Dynamics, 3rd ed., paragraph 6.1.4 (pp. 173) for an account of possible methods to determine the stability time step. For cell centered finite...
Forum: Main CFD Forum August 18, 2016, 05:56
Replies: 10
Views: 470
Posted By sbaffini
I was unsure about this but had the same feeling....

I was unsure about this but had the same feeling. I guess i cannot be forced to remove the Elsevier link ;)
Forum: Main CFD Forum August 18, 2016, 05:21
Replies: 10
Views: 470
Posted By sbaffini
I have to disagree, i bought the book not later...

I have to disagree, i bought the book not later than 3-4 months ago and no such CD was in the book (even if, with Amazon, i never got any cd... just once). Also, it is not even mentioned (maybe it...
Forum: Main CFD Forum August 18, 2016, 04:55
Replies: 10
Views: 470
Posted By sbaffini
As owner of the book i agree, but notice that: ...

As owner of the book i agree, but notice that:

1) there is not even a clue, in the book, on how to get such codes

2) anyone can reach the site (it's just the book site) and download them
Forum: Main CFD Forum August 15, 2016, 12:36
Replies: 10
Views: 470
Posted By sbaffini
http://booksite.elsevier.com/9780080999951/example...

http://booksite.elsevier.com/9780080999951/examplecodes.php
Forum: Main CFD Forum August 9, 2016, 06:33
Replies: 12
Views: 713
Posted By sbaffini
I would add that: 1) Fortran 2008 can easily...

I would add that:

1) Fortran 2008 can easily manage most of the modern programming needs if you know how to use it

2) If you just want to make a lid driven cavity solver and learn Fortran in...
Forum: FLUENT March 31, 2016, 05:15
Replies: 12
Views: 1,191
Posted By sbaffini
If you search for the paper: Sensitivity...

If you search for the paper:

Sensitivity Analysis on Numerical Parameters for Large Eddy Simulation with an Unstructured Finite Volume Commercial Code

you will find it both under google...
Forum: Main CFD Forum February 27, 2016, 06:32
Replies: 9
Views: 310
Posted By sbaffini
I might have seriously overlooked at the matter...

I might have seriously overlooked at the matter (i only did staggered grid once, around 10 years ago, and without periodicity). Actually, what i suggested works properly for colocated finite...
Forum: Main CFD Forum February 26, 2016, 17:13
Replies: 9
Views: 310
Posted By sbaffini
You should be able to use it independently for...

You should be able to use it independently for each grid. Maybe is something hardcoded in the implicit part?
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