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August 11, 2011, 05:54 |
Liquid-Solid Modeling
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#1 |
Member
Hamed
Join Date: Oct 2009
Posts: 64
Rep Power: 16 |
Dear friends,
I am going to modeling a simple tube containing water and solid particles using eulerian-eulerian model but unfortunately I do not get good results and I get very bad results , I mean the particles at the end of the tube collect at the top of the tube , how ever that the density of particles are much more than that of water and the particles should collect at the bottom of the tube, I do not know what is the problem, can any body help me ? is there any tutorial about liquid-soid modeling ? I have read the examples of tutorial. |
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August 11, 2011, 07:55 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
I think there are some tutorials on eular-eular modelling which come with CFX.
If the particles go up not down are you sure you have the gravity vector in the correct direction? |
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August 11, 2011, 08:11 |
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#3 |
Member
Hamed
Join Date: Oct 2009
Posts: 64
Rep Power: 16 |
yes I have defined the gravity direction correctly.
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August 11, 2011, 11:43 |
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#4 |
Member
Hamed
Join Date: Oct 2009
Posts: 64
Rep Power: 16 |
Dear Glenn,
I checked the problem, I found the reason in fact I do not know why the software automatically change the particle material to air, do you know what is the problem ? |
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August 11, 2011, 19:19 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
You have not specified your materials correctly. Have a look at the CFX tutorials on how to specify materials.
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August 16, 2011, 08:48 |
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#6 |
Senior Member
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Colleague work with the discret model (lagrange).
good Luck |
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August 16, 2011, 18:27 |
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#7 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Why use particle tracking? The eularian approach is a valid way of modelling particle laden flows and for densely packed flows the lagragian approach is not suitable.
Hamed has not said anything which suggests the eularian approach is not suitable. |
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August 16, 2011, 19:17 |
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#8 |
Senior Member
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Glenn,
You are right, but when you have small quantities of a dispresed phase, you should use the disscrete model. Indeed both approach are valid, but Lagrange model will work better, you can read the FLUENT tutorial, where they explain very well about the stokes number and the other propierties which you have to evaluate before selecting the suitable model. In theory Every model would work, but in the reality just one will give you the results you need. |
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