Forum: OpenFOAM Running, Solving & CFD
June 23, 2009, 04:14
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Replies: 99
Views: 22,647
Hi Alberto,
limiting nutb/nub seems to be...
Hi Alberto,
limiting nutb/nub seems to be interesting even I will try that in my Pfleger bubble column case for air-water.
Coming back to Steel-argon case yesterday I tried with structured...
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Forum: OpenFOAM Running, Solving & CFD
June 20, 2009, 17:18
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Replies: 99
Views: 22,647
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Forum: OpenFOAM Running, Solving & CFD
June 18, 2009, 03:18
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Replies: 99
Views: 22,647
Hello Alberto,
Yes you are right. I could...
Hello Alberto,
Yes you are right. I could have started with structured grids but I already had simulation running in CFX with this unstructured grids (of 0.5 Million cells) so I though to doing...
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Forum: OpenFOAM Running, Solving & CFD
June 16, 2009, 03:41
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Replies: 99
Views: 22,647
Hi Alberto,
yes for the rectangular bubble...
Hi Alberto,
yes for the rectangular bubble column I used turbulence for steel-air also
but for the cylindrical case it is creating problem..
I changed the solver schemes for pressure
p...
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Forum: OpenFOAM Running, Solving & CFD
June 15, 2009, 10:29
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Replies: 99
Views: 22,647
is that because of unstructured grid?
Hi Alberto and Rachel,
I tried injecting Steel-Argon with my earlier becker 3D case (rectangular bubblecolumn which I used to validate water-air case) and with some modification with pressure...
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Forum: OpenFOAM Running, Solving & CFD
June 3, 2009, 05:34
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Replies: 99
Views: 22,647
@ Alberto
I am modelling steel as Newtonian fluid
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Forum: OpenFOAM Running, Solving & CFD
June 3, 2009, 04:49
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Replies: 99
Views: 22,647
Hi Rachel Vogl, Good morning :)
I used...
Hi Rachel Vogl, Good morning :)
I used limiting scheme divScheme as you suggested but there was not much improvement (simulation still crashing for high density case and with free surface)
...
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Forum: OpenFOAM Running, Solving & CFD
June 3, 2009, 04:40
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Replies: 99
Views: 22,647
Hi Alberto,
Literatures what I am refering...
Hi Alberto,
Literatures what I am refering ..
1. Turbulent Flow of Liquid Steel and Argon Bubbles in Slide-Gate Tundish Nozzles: Part I. Model Development and Validation
by HUA BAI and BRIAN...
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Forum: OpenFOAM Running, Solving & CFD
June 2, 2009, 18:26
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Replies: 99
Views: 22,647
Hi Alberto,
I have few results done in CFX...
Hi Alberto,
I have few results done in CFX to validate my steel-argon case and it is based on two-fluid approach
also few literature where where steel argon simulation is performed based on two...
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Forum: OpenFOAM Running, Solving & CFD
June 2, 2009, 14:05
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Replies: 99
Views: 22,647
@ Rachel,
As the simulation was not stable I...
@ Rachel,
As the simulation was not stable I tried using first order schemes for all variables and I changed the pressure tolerance to 1 e-04
Can I mail you the case setup files because I had...
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Forum: OpenFOAM Running, Solving & CFD
June 2, 2009, 13:36
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Replies: 99
Views: 22,647
Hi Rachel,
thanks for your reply.
...
Hi Rachel,
thanks for your reply.
currently I am limiting Co to 0.85 and the corresponding deltaT is 3.6e-07 seconds. When I decrease the upper limit to 0.2 then deltaT will be reduced further :(...
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Forum: OpenFOAM Running, Solving & CFD
June 2, 2009, 07:29
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Replies: 99
Views: 22,647
..High density flows in twoPhaseEulerFOAM
Hi Alberto
After this Water-air (Becker case) two phase flows
Now, I am tring to Simulate Steel-Argon flows as part of my master thesis work
(steel continuous phase and argon discrete phase)...
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Forum: OpenFOAM Running, Solving & CFD
April 21, 2009, 09:37
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Replies: 99
Views: 22,647
Hi Alberto
Am back to this thread !
...
Hi Alberto
Am back to this thread !
I just finished the 2D simulation of bubble column, becker case (with turbulence being on)
I would like to discuss the results here
.> The...
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Forum: OpenFOAM Running, Solving & CFD
March 24, 2009, 14:45
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Replies: 99
Views: 22,647
Hi again,
Sorry, I think I fixed the other...
Hi again,
Sorry, I think I fixed the other issue I was plotting particle velocity rather than plotting continuous phase velocity..
But the particle velocity Uay vs Time T is not fixed..which am...
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Forum: OpenFOAM Running, Solving & CFD
March 24, 2009, 14:34
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Replies: 99
Views: 22,647
Hi Alberto,
I followed the steps you...
Hi Alberto,
I followed the steps you suggested in the previous but in the output window it says input and output array data types do not match.
I tried to plot lateral velocity (Uay) at the...
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Forum: OpenFOAM Running, Solving & CFD
March 23, 2009, 15:07
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Replies: 99
Views: 22,647
Hi Alberto,
I dont know how appropriate is...
Hi Alberto,
I dont know how appropriate is to discuss this issue in this thread as it is related to post processing in paraFoam.
Now, the simulation is almost done (just around 100 seconds...
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Forum: OpenFOAM Running, Solving & CFD
March 20, 2009, 10:07
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Replies: 99
Views: 22,647
Results quite comparable..
Hello Alberto,
Finally, my simulation is quite stable and I checked the intermediate results in paraFoam and seeems to be quite good..(though I haven't compared with Becker et al experiments...
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Forum: OpenFOAM Running, Solving & CFD
March 18, 2009, 14:31
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Replies: 99
Views: 22,647
Hello Alberto,
yeah..I kept in mind before...
Hello Alberto,
yeah..I kept in mind before editing those relaxation parameters.
but there was no other go...I was totally exhausted.
Probably after a days break from OpenFOAM .. I though to...
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Forum: OpenFOAM Running, Solving & CFD
March 18, 2009, 12:55
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Replies: 99
Views: 22,647
Hi..Alberto and Junwei
Just an hour...
Hi..Alberto and Junwei
Just an hour back...finally :)
With the low relaxation parameters and piso correctors in fvSolution changed to 8 (from previous value 2 as suggested from my...
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Forum: OpenFOAM Running, Solving & CFD
March 17, 2009, 16:16
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Replies: 99
Views: 22,647
Hello Alberto,
There was some problem with...
Hello Alberto,
There was some problem with nutb because of its very high value (1e+10) the simulation used to crash. To correct this I initialized very low value of epsilon (1e-08..previous value...
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Forum: OpenFOAM Running, Solving & CFD
March 17, 2009, 09:43
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Replies: 99
Views: 22,647
Hi ..
am back
unfortunately with...
Hi ..
am back
unfortunately with probelms again..
I tried to simulate the case with turbulence being "on" so that it can be compared with experimental results..
As I said in the...
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Forum: OpenFOAM Running, Solving & CFD
March 17, 2009, 05:02
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Replies: 99
Views: 22,647
Hi Alberto Passalacqua,
Yes, as you said...
Hi Alberto Passalacqua,
Yes, as you said the simulation is quite stable with turbulence being off (even I tried with my earlier mesh in both bubbleFoam solver and twoPhaseEulerFoam solver).
...
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Forum: OpenFOAM Running, Solving & CFD
March 16, 2009, 15:58
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Replies: 99
Views: 22,647
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Forum: OpenFOAM Running, Solving & CFD
March 16, 2009, 15:06
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Replies: 99
Views: 22,647
Yes, am trying to simulate Becker case and...
Yes, am trying to simulate Becker case and compare the results experimentally done by D. Pfleger and S. Becker .
Moreover am very much new to the OpenFOAM and what I do could be very much simple to...
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Forum: OpenFOAM Running, Solving & CFD
March 16, 2009, 06:22
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Replies: 99
Views: 22,647
Hi Alberto Passalacqua,
Yes as you said the...
Hi Alberto Passalacqua,
Yes as you said the gas velocity at the inlet was not same as in Becker case.
I made the following changes (corrected mistakes)
. increased inlet width (4cm)
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