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FLUENT 6.3 for particle deposition studies?

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Old   January 19, 2009, 17:48
Default FLUENT 6.3 for particle deposition studies?
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Prashanth
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Hello all

I am working on CFD simulation of syngas deposition on a high pressure turbine vane. While going through literature on this topic, I found that FLUENT 4.4.7 is the best version for this study as the particle-wall interaction is more realistically modeled in this version than in FLUENT 5. FLUENT 5 uses rebounding/sticking for all particles while 4.4.7 allows the condition of the particle at the surface to be determined by user defined subroutines. I want to know if FLUENT 6.3 has the capability of 4.4.7 in this area. If not, what are my options?

Thanks,

Prashanth
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Old   January 20, 2009, 14:11
Default Re: FLUENT 6.3 for particle deposition studies?
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Allan Walsh
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Yes, you can use a user defined function to specify the fate of a particle when contacting a wall in Fluent 6.3.

We had several subroutines for this purpose which we ported directly from Fluent 4 to Fluent 6, bypassing version 5.

By the way, hopefully Fluent 12 will released in the first part of this year, which does provide some additional features.
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Old   June 29, 2010, 13:26
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hi

I'm working with fluent 6.3.26 and i want to know if i can put an specific quantity (KG) in a specific wall and then set a velocity inlet in order to carry out the particles in the wall.

regards
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Old   November 9, 2011, 09:54
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Quote:
Originally Posted by Allan Walsh
;156106
Yes, you can use a user defined function to specify the fate of a particle when contacting a wall in Fluent 6.3.

We had several subroutines for this purpose which we ported directly from Fluent 4 to Fluent 6, bypassing version 5.

By the way, hopefully Fluent 12 will released in the first part of this year, which does provide some additional features.
Hello, I need some info. I am new in this UDF codes, without knowledge in FORTRAN or C language. Any way, I have found a code that I can use for particle - wall Interaction USREFL.F that is used in Fluent 4. I am working in Fluent 6. How can I use this code?

Regards!
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Old   April 15, 2012, 16:44
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hi,
I want to model deposition of particles by thermophoretic force and brownian diffusion in laminar flow. i want to use euler-euler approach,but i dont know which of these models i must use,species model or multiphase model.also i work with fluent 6.3.26
thanks a lot
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Old   April 16, 2012, 04:34
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Originally Posted by fariba.j View Post
hi,
I want to model deposition of particles by thermophoretic force and brownian diffusion in laminar flow. i want to use euler-euler approach,but i dont know which of these models i must use,species model or multiphase model.also i work with fluent 6.3.26
thanks a lot
Dear Fariba,

If you want to use Eulerian approach; you can perform UDS equation as a simplified form of species transport; here, the diffusion term plays the brownian role.

Bests,
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Old   April 18, 2012, 15:40
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Originally Posted by Amir View Post
Dear Fariba,

If you want to use Eulerian approach; you can perform UDS equation as a simplified form of species transport; here, the diffusion term plays the brownian role.

Bests,
hi
thanks for your answer,i think i need udf to add thermophoresis term to uds,also uds is for single-phase
if I want to model coagulation of particles with their thermophoresis deposition,i have to use population balance,for this case,i have to add themophoresis & brownian diffusion terms to this equation with a udf,is that true??? pleas help me
thanks
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Old   April 19, 2012, 04:16
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Quote:
Originally Posted by fariba.j View Post
hi
thanks for your answer,i think i need udf to add thermophoresis term to uds,also uds is for single-phase
if I want to model coagulation of particles with their thermophoresis deposition,i have to use population balance,for this case,i have to add themophoresis & brownian diffusion terms to this equation with a udf,is that true??? pleas help me
thanks
Dear Fariba,

Regarding thermoforetic term, you have to use a UDF but coagulation effect is a lagrangian feature and you may model it in eulerian point of view. But about brownian effect, you don't need any UDF; the diffusion term of UDS equation has required effect.

Bests,
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Old   April 19, 2012, 14:44
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Originally Posted by Amir View Post
Dear Fariba,

Regarding thermoforetic term, you have to use a UDF but coagulation effect is a lagrangian feature and you may model it in eulerian point of view. But about brownian effect, you don't need any UDF; the diffusion term of UDS equation has required effect.

Bests,
Dear Amir,
I agree with you,but I don't know, how I can perform thermophoretic with a udf to uds,through sourse term?! but source term must be constant,while my source term is a function.
also,uds is for single-phase,while I have a particle-laden flow(discrete particles in a countinous gas flow),in material panel,I have to only introduce gas(for example air) as material? I mustn't define two materil (a gas and a solid) in fluid catigory and define their properties???

cheers,
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Old   April 19, 2012, 16:38
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Originally Posted by fariba.j View Post
how I can perform thermophoretic with a udf to uds,through sourse term?! but source term must be constant,while my source term is a function.
The source term can be a function of other parameters! Here this a function of temperature gradient and you can perform it with a simple UDF. (refer to UDF manual)
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Originally Posted by fariba.j View Post
also,uds is for single-phase,while I have a particle-laden flow(discrete particles in a countinous gas flow),in material panel,I have to only introduce gas(for example air) as material? I mustn't define two materil (a gas and a solid) in fluid catigory and define their properties???
You have one material if you want to use eulerian approach as you said before. In this methodology, you'll obtain particle concentration (UDS; a scalar) not the particle trajectories and the only particle-related data is diffusion coefficient which provided in base material panel.
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Old   April 20, 2012, 03:13
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my professor believe that for my problem, I have to spot one-phase, and calculate particle concentration with a uds,but I think I have to spot two-phase(fluid-solid) and use mixture multiphase model(i spot the same velocity for phases,so mixture model reduce to homogenous multiphase flow) and calculate particle concentration with a uds.which of us say correct?

Last edited by fariba.j; April 20, 2012 at 03:31.
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Old   April 20, 2012, 03:29
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[QUOTE=Amir;355710]The source term can be a function of other parameters! Here this a function of temperature gradient and you can perform it with a simple UDF. (refer to UDF manual
In sorce term help,say that in sorce term panel,from drop-list you can choose none,constant or udf for defining your source term.But there aren't udf option in drop-list(only none and constant),so I don't know, how I can define a non-constant term to uds through udf!
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Old   April 20, 2012, 05:24
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Quote:
Originally Posted by fariba.j View Post
my professor believe that for my problem, I have to spot one-phase, and calculate particle concentration with a uds,but I think I have to spot two-phase(fluid-solid) and use mixture multiphase model(i spot the same velocity for phases,so mixture model reduce to homogenous multiphase flow) and calculate particle concentration with a uds.which of us say correct?
I agree with your supervisor. Computing particle concentration doesn't need extra phase and can be easily handled via a UDS in a single phase.
Quote:
Originally Posted by fariba.j View Post
In sorce term help,say that in sorce term panel,from drop-list you can choose none,constant or udf for defining your source term.But there aren't udf option in drop-list(only none and constant),so I don't know, how I can define a non-constant term to uds through udf!
After loading a UDF for source term, you can see and choose UDF option in this panel.

Bests,
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Old   April 21, 2012, 13:46
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After loading a UDF for source term, you can see and choose UDF option in this panel.

Bests,[/QUOTE]


thank you very much,for your guidance. but my continous equation doesn't converge(I specified 1e-6 for residual)
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