Forum: OpenFOAM Running, Solving & CFD
January 24, 2015, 10:28
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Replies: 4
Views: 1,647
I didn't suggest to turn off gravity to reach...
I didn't suggest to turn off gravity to reach true answer. It was a trick to find the source of difference between icoFoam and DPMFoam results. So If you want compare both solvers you need to use...
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Forum: OpenFOAM Running, Solving & CFD
January 24, 2015, 02:52
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Replies: 4
Views: 1,647
Hi,
Check the kinematic viscosity and density...
Hi,
Check the kinematic viscosity and density of fluid phase.
The reason behind the unrealistic result is gravity effect on fluid. When I turned off the gravity the result was ok, so it is because...
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Forum: Site News & Announcements
January 19, 2015, 03:30
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Replies: 22
Views: 25,746
happy birth day
It is the best and first online resource in CFD field.
Happy birthday to you :)
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Forum: OpenFOAM Programming & Development
December 9, 2014, 17:46
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Replies: 35
Views: 31,229
Hi Bruno,
You are a kind expert in fluid...
Hi Bruno,
You are a kind expert in fluid mechanics and C++ programming and I and other cfd-online users have learned a lot from you. Thanks
Hi Charlie,
Use something like this:
{
...
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Forum: OpenFOAM Programming & Development
December 7, 2014, 17:07
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Replies: 11
Views: 4,429
If definition of Kn and kn are same in...
If definition of Kn and kn are same in Fn=Kn*delta_n^1.5 and Fn=kn*delta_n^1, it will cause many difference in Fn if we change "b" magnitude and switch between linear (b=1) and hertzian (1.5) because...
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Forum: OpenFOAM Programming & Development
December 7, 2014, 15:45
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Replies: 11
Views: 4,429
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Forum: OpenFOAM Programming & Development
November 30, 2014, 16:20
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Replies: 35
Views: 31,229
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Forum: OpenFOAM Programming & Development
November 23, 2014, 14:35
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Replies: 35
Views: 31,229
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Forum: OpenFOAM Programming & Development
November 6, 2014, 17:55
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Replies: 35
Views: 31,229
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Forum: OpenFOAM Programming & Development
November 3, 2014, 18:24
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Replies: 35
Views: 31,229
Hi all,
I am trying to write a time varying...
Hi all,
I am trying to write a time varying boundary condition (http://www.cfd-online.com/Forums/openfoam-pre-processing/121366-time-varying-boundary-condition.html#post515434)which accounts inlet...
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Forum: OpenFOAM Programming & Development
October 21, 2014, 17:26
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Replies: 35
Views: 31,229
We want use available boundary conditions of...
We want use available boundary conditions of fixedValue (BC1), uniformFixedValue (BC2) and interstitialInletVelocity (BC3) to write own myInterstitialInletVelocity (BC4).
BC4 will have advantages of...
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Forum: OpenFOAM Running, Solving & CFD
October 21, 2014, 00:32
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Replies: 7
Views: 20,758
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Forum: OpenFOAM Programming & Development
October 19, 2014, 01:06
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Replies: 35
Views: 31,229
Hi Bruno,
I know the difference between u and...
Hi Bruno,
I know the difference between u and U, the actual and superficial velocity with relation of U=alpha*u.
This is the main advantage of "interstitialInletVelocity" to "fixedValue" and...
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Forum: OpenFOAM Post-Processing
October 16, 2014, 22:46
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Replies: 3
Views: 1,241
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Forum: OpenFOAM Programming & Development
October 15, 2014, 00:17
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Replies: 11
Views: 4,429
Thanks Kyle and Ananda,
If I understand...
Thanks Kyle and Ananda,
If I understand correctly we have one spring stiffness for both of linear and Hertzian models. The difference is in "b" parameter (1 or 1.5) which is the power of delta_n . I...
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Forum: OpenFOAM Programming & Development
October 12, 2014, 23:04
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Replies: 35
Views: 31,229
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Forum: OpenFOAM Programming & Development
October 9, 2014, 00:09
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Replies: 11
Views: 4,429
Collision spring stiffness value in DPMFoam
Hi all,
Based on Hertzian Theory as discussed in Tsuji (1992, 1993) papers, the spring stiffness is a function of Young's modulus and Poison's ratio. It says we can consider the elastic part of...
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Forum: OpenFOAM Post-Processing
October 7, 2014, 16:19
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Replies: 3
Views: 1,241
Temporal Averaging in Postprocessing
Hi all,
I want calculate mean temporal of alph.air from existed results and write alpha.airMean in each folder. I didn't do that in running process so I should do it as postprocessing. Is it any way...
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Forum: OpenFOAM Programming & Development
October 5, 2014, 21:28
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Replies: 35
Views: 31,229
Hello
I need varying BC for...
Hello
I need varying BC for interstitialInletVelocity which can be found in DPMFoam/Goldschemidt. Using table for fixed value:
bottom
{
type uniformFixedValue;
uniformValue table
...
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Forum: OpenFOAM Pre-Processing
October 5, 2014, 20:25
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Replies: 14
Views: 10,232
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Forum: OpenFOAM Pre-Processing
October 5, 2014, 20:13
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Replies: 5
Views: 3,210
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Forum: OpenFOAM Pre-Processing
October 5, 2014, 04:33
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Replies: 14
Views: 10,232
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Forum: OpenFOAM Pre-Processing
October 4, 2014, 23:41
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Replies: 5
Views: 3,210
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Forum: OpenFOAM Pre-Processing
October 4, 2014, 23:34
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Replies: 14
Views: 10,232
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Forum: OpenFOAM
July 25, 2014, 11:16
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Replies: 2
Views: 1,871
nSubCycles criteria
Hi Foamers,
As you know, in gas-solid flows there are two time steps; one for continuous phase and the other for disperse phase which is usually less than first one. It is introduced as nSubCycles...
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