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Search: Posts Made By: maysmech
Forum: OpenFOAM Running, Solving & CFD January 24, 2015, 11:28
Replies: 4
Views: 186
Posted By maysmech
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...
Forum: OpenFOAM Running, Solving & CFD January 24, 2015, 03:52
Replies: 4
Views: 186
Posted By maysmech
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...
Forum: Site News & Announcements January 19, 2015, 04:30
Replies: 22
Views: 17,070
Posted By maysmech
Smile happy birth day

It is the best and first online resource in CFD field.

Happy birthday to you :)
Forum: OpenFOAM Programming & Development December 9, 2014, 18:46
Replies: 25
Views: 1,932
Posted By maysmech
Smile 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:
{
...
Forum: OpenFOAM Programming & Development December 7, 2014, 18:07
Replies: 6
Views: 469
Posted By maysmech
Lightbulb 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...
Forum: OpenFOAM Programming & Development December 7, 2014, 16:45
Replies: 6
Views: 469
Posted By maysmech
Lightbulb If anyone has any Idea will be appreciated to...

If anyone has any Idea will be appreciated to share.
Regards,
Forum: OpenFOAM Programming & Development November 30, 2014, 17:20
Replies: 25
Views: 1,932
Posted By maysmech
Hi Bruno, Thank you very much for spending...

Hi Bruno,

Thank you very much for spending your valuable time on this issue.

I checked. it works perfect.

Best regards,
Forum: OpenFOAM Programming & Development November 23, 2014, 15:35
Replies: 25
Views: 1,932
Posted By maysmech
Question Thanks Bruno for merging these threads. If...

Thanks Bruno for merging these threads.

If anyone has any Idea for first (BC4) or second (script) way it will be appreciated to share with others.

Regards,
Forum: OpenFOAM Programming & Development November 6, 2014, 18:55
Replies: 25
Views: 1,932
Posted By maysmech
Question Groovy boundary condition doesn't work with such...

Groovy boundary condition doesn't work with such boundary condition, as far as I know.
The type of boundary condition is interstitialInletVelocity which divide velocity over air volume fraction. ...
Forum: OpenFOAM Programming & Development November 3, 2014, 19:24
Replies: 25
Views: 1,932
Posted By maysmech
Lightbulb 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...
Forum: OpenFOAM Programming & Development October 21, 2014, 17:26
Replies: 25
Views: 1,932
Posted By maysmech
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...
Forum: OpenFOAM Running, Solving & CFD October 21, 2014, 00:32
Replies: 6
Views: 5,648
Posted By maysmech
Question Hi all, In a fluidized bed which the top is set...

Hi all,
In a fluidized bed which the top is set zero constant pressure, it is predicted to have positive pressure in the inlet, because of pressure drop in the direction from inlet to outlet. the...
Forum: OpenFOAM Programming & Development October 19, 2014, 01:06
Replies: 25
Views: 1,932
Posted By maysmech
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...
Forum: OpenFOAM Post-Processing October 16, 2014, 22:46
Replies: 3
Views: 243
Posted By maysmech
Thanks, but I don't want run the code again. I...

Thanks, but I don't want run the code again.
I have results now and want do averaging.
Forum: OpenFOAM Programming & Development October 15, 2014, 00:17
Replies: 6
Views: 469
Posted By maysmech
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...
Forum: OpenFOAM Programming & Development October 12, 2014, 23:04
Replies: 25
Views: 1,932
Posted By maysmech
Question Thanks Bruno, Do you know what is the difference...

Thanks Bruno, Do you know what is the difference between "inletVelocity" and "value" in this BC?
fixedValue and uniformFixedValue value need one velocity but this on needs two.
Forum: OpenFOAM Programming & Development October 9, 2014, 00:09
Replies: 6
Views: 469
Posted By maysmech
Question 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...
Forum: OpenFOAM Post-Processing October 7, 2014, 16:19
Replies: 3
Views: 243
Posted By maysmech
Question 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...
Forum: OpenFOAM Programming & Development October 5, 2014, 21:28
Replies: 25
Views: 1,932
Posted By maysmech
Lightbulb 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
...
Forum: OpenFOAM Pre-Processing October 5, 2014, 20:25
Replies: 11
Views: 1,344
Posted By maysmech
Thank you very much Bruno. I used a lot from your...

Thank you very much Bruno. I used a lot from your step by step debugging.
Especially Banana and Old-School debugging were fantastic.
This problem is for other forces too such as pressure gradient...
Forum: OpenFOAM Pre-Processing October 5, 2014, 20:13
Replies: 5
Views: 557
Posted By maysmech
Thanks, But it leads to this error: --> FOAM...

Thanks, But it leads to this error:

--> FOAM FATAL ERROR:

request for volVectorField Uc from objectRegistry region0 failed
available objects of type volVectorField are
1(U.air)

...
Forum: OpenFOAM Pre-Processing October 5, 2014, 04:33
Replies: 11
Views: 1,344
Posted By maysmech
Question For example for DPMFoam

For example for DPMFoam
Forum: OpenFOAM Pre-Processing October 4, 2014, 23:41
Replies: 5
Views: 557
Posted By maysmech
Hi, It doesn't work with DPMFoam in 2.3.0

Hi,
It doesn't work with DPMFoam in 2.3.0
Forum: OpenFOAM Pre-Processing October 4, 2014, 23:34
Replies: 11
Views: 1,344
Posted By maysmech
Question Hi all, Do you find any dictionary for...

Hi all,
Do you find any dictionary for saffmanMeiLiftForce?
Forum: OpenFOAM July 25, 2014, 11:16
Replies: 0
Views: 185
Posted By maysmech
Question 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...
Showing results 1 to 25 of 347

 
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