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January 19, 2009, 17:48 |
FLUENT 6.3 for particle deposition studies?
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#1 |
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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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January 20, 2009, 14:11 |
Re: FLUENT 6.3 for particle deposition studies?
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#2 |
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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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June 29, 2010, 13:26 |
particles
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#3 |
New Member
eloy vilchis
Join Date: Aug 2009
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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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November 9, 2011, 09:54 |
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#4 | |
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Jovana Milenkovic
Join Date: May 2011
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Quote:
Regards! |
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April 15, 2012, 16:44 |
deposition of particles
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#5 |
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fariba
Join Date: Oct 2011
Posts: 9
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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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April 16, 2012, 04:34 |
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#6 | |
Senior Member
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Quote:
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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Amir |
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April 18, 2012, 15:40 |
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#7 | |
New Member
fariba
Join Date: Oct 2011
Posts: 9
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Quote:
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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April 19, 2012, 04:16 |
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#8 | |
Senior Member
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Quote:
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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Amir |
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April 19, 2012, 14:44 |
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#9 | |
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fariba
Join Date: Oct 2011
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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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April 19, 2012, 16:38 |
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#10 | ||
Senior Member
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Quote:
Quote:
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Amir |
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April 20, 2012, 03:13 |
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#11 |
New Member
fariba
Join Date: Oct 2011
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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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April 20, 2012, 03:29 |
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#12 |
New Member
fariba
Join Date: Oct 2011
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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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April 20, 2012, 05:24 |
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#13 | ||
Senior Member
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Quote:
Quote:
Bests,
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Amir |
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April 21, 2012, 13:46 |
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#14 |
New Member
fariba
Join Date: Oct 2011
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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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September 17, 2015, 03:05 |
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#15 |
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Join Date: Nov 2014
Posts: 42
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Hi there
I'm simulating nanofluid flow in microchannel, I want to use one transport equation for volume fraction. I wrote udf but I have problem 1- the error is : Label "n_uds" not found. : function " internal_error " not found. this is one part of my cod: enum { alpha, A, B, N_REQUIRED_UDS }; DEFINE_ADJUST(alpha_adjust,d) { real Laplacian; Thread *t; cell_t c; if(N_UDS<N_REQUIRED_UDS) Internal_Error("not enough user-defined scalars allocated"); thread_loop_c(t,d) { begin_c_loop(c,t) { C_UDSI(c,t,1)=C_T_G(c,t)[0]; C_UDSI(c,t,2)=C_T_G(c,t)[1]; /*C_UDSI(c,t,3)=C_T_G(c,t)[2];*/ Laplacian=Laplacian+C_UDSI_G(c,t,1)[0]+C_UDSI_G(c,t,2)[1]; } end_c_loop(c,t) } C_UDSI(c,t,1)=Laplacian; } As you see I used 3 uds, 1 for volume fraction, 2 others for calculation of temperature gradient and make Laplacian. is it write? 2-another question is I used single phase, is it write? I would appreciate if anyone can help me. |
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