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Old   December 9, 2011, 01:57
Default Help in DPM Model
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I an using a unsteady state DPM model.
I want to view the different droplets diameter in my domain that are been injected into my computational domain.
Kindly help me by telling ho w to do that.

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Old   December 9, 2011, 03:57
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Quote:
Originally Posted by shk12345 View Post
I an using a unsteady state DPM model.
I want to view the different droplets diameter in my domain that are been injected into my computational domain.
Kindly help me by telling ho w to do that.

SHK
"Display->particle tracks .... colored by particle diameter"!

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Old   December 9, 2011, 10:22
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Thanks Amir

But in that case we can see different colors of particles diameters
I want such as if the bigger particles gives a bigger diameter and smaller particles gives smaller diameter.
How can that be possible

Thanks in advance

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Old   December 9, 2011, 12:15
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Quote:
Originally Posted by shk12345 View Post
Thanks Amir

But in that case we can see different colors of particles diameters
I want such as if the bigger particles gives a bigger diameter and smaller particles gives smaller diameter.
How can that be possible

Thanks in advance

SHK
Hi,

I think this not possible with FLUENT itself but I saw such presentation done with FLUENT+EDEM plug-in which is not free of course.
www.dem-solutions.com

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Old   December 9, 2011, 12:19
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Thanks
i am trying to simulate a nozzel oulet using surface injection using DPM.
What other ways in DPM we can do it to obtain good results.
Can we have VOF model to get the spray particle size and distribution also.
Which is the other better way to do it.
Kindly suggest.

Thanks
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Old   December 9, 2011, 12:32
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Quote:
Originally Posted by shk12345 View Post
Thanks
i am trying to simulate a nozzel oulet using surface injection using DPM.
What other ways in DPM we can do it to obtain good results.
Can we have VOF model to get the spray particle size and distribution also.
Which is the other better way to do it.
Kindly suggest.

Thanks
It depends on particle diameter range. Using multi-phase models is not common for particles unless the cases which obey its physics like splashing pocket of fluids and ....
For nano particles; Eulerian method via solving scalar transport equation is recommended. (UDS in FLUENT) and for other ranges of diameter DPM can lead to reasonable results; although, there are few bugs in brownian motion and particle deposition...

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Old   December 9, 2011, 12:41
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Thanks
Like in my case i want am simulation a atomizer .
I am using a DPM model right now.
But how do i approach the problem, in my case i want to use a multiphase model.

And in multiphase model i want to see the droplet dispersion,collision,breakup etc in my model.

Like in eulerian model we cannot see the droplet by visualization that we can do in VOF. But anyhow using any of these models can i measure the droplet size and distribution.
Kindly help me
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Old   December 9, 2011, 12:55
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Obviously, multi-phase models is not proper for atomizers! but DPM has these capabilities such as collision and .... It's true that FLUENT doesn't show real diameters but it accounts in according eqauations; you should choose appropriate model based on proper physics coincidence not the post processing features; nevertheless, I'm not an expert in this field but maybe you can achieve your purpose by using other post-processors.

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Old   December 9, 2011, 12:59
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hi
What other post processors you are talking about .

Thanks
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Old   December 9, 2011, 16:06
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Quote:
Originally Posted by shk12345 View Post
hi
What other post processors you are talking about .

Thanks
SHK
As I said, I'm not sure but I know tecplot can import particle data; maybe it can show particles according to their real size.

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