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November 15, 2011, 01:23 
Eulerian lagrangian model

#1 
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shoeb khan
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Hi
Can anyone help me in telling me how can i set up a eulerian lagrangian model in fluent. Thanks in advance SHK 

November 16, 2011, 20:16 

#2 
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raj
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You have to use Discrete phase models available in Fluent . The continuous phase is solved like an continuum and the secondary phase/discrete phase is solved through lagrangian method.


November 17, 2011, 13:20 
Cfd

#3 
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shoeb khan
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Kindly tell me the steps to put a eulerian langrangian model in fluent.
I am not been able to interlink the secondary phase of the DPM model with the secondary phase of the eulerian model kindly tell me how to do that Thanks SHK 

November 21, 2011, 10:15 

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Quote:
After loading the mesh file, go to the models. Select your turbulence model then select Discrete Phase. If you want the particles to exchange momentum with the continuous plahse than select the option "interaction with continuous phase". Now click the injections button. Then click create button. Add your particle properties and the way particles are injected. You may have these via spray cone, single stream etc... Specify the position of injector (x, y and z) in the same window. Also specify the number of particle streams. That should be it. You can specify the physical properties of the injected particles in the Materials menu. 

November 22, 2011, 08:01 
Help

#5 
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shoeb khan
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Hello
Thanks for the reply I have one clarification. While using the EulerianLangrangian Model is it so that we have to on the eulerian model from define>model>multiphase>eulerian and then on the dpm model as discussed above or Dpm itself takes care of the eulerian and Lagrangian framework of the calculation. and Is that possible to use both eulerian and dpm model at the same time in fluent if yes how?? Thanks SHK 

November 22, 2011, 14:48 

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Quote:


November 23, 2011, 01:09 
Help

#7 
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shoeb khan
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Thanks for the reply but my question remains the same??
Can we use both both DPM and multiphase eulerian model at the same time.If yes how?? Thanks Shk 

November 23, 2011, 05:27 

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November 29, 2013, 03:12 

#9 
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mit.R
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hi mali
is discrete phase (particles), turbulence always? 

March 24, 2015, 23:19 

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masoudeh
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March 25, 2015, 01:16 

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Have you tried using the multiphase Eulerian model and then enabling the DPM as well to see for yourself? I can't think of any reason that DPM couldn't be used with the multiphase model; especially if you're only concerned with oneway coupling.


March 25, 2015, 21:39 

#12  
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By the way, I used two way coupling, what is the difference it makes compared to one way coupling? Thanks 

March 25, 2015, 21:44 

#13  
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masoudeh
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I have problem when I add injection! Actually i am interested to have injection so that i can see particle track. can you help me please 

March 25, 2015, 21:55 

#14 
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What do you mean by "injection"? If you don't specify an injection for the DPM, then you're not using the Lagrangian model (or DPM) at all.
Oneway coupling is where the particles are influenced by the fluid; for example, the particles would tend toward the fluid velocity due to drag (and the speed of which is a function of the particle relaxation time). Twoway coupling also includes the influence of the particles on the fluid. Lastly, fourway coupling also considers the particleparticle interactions. 

March 25, 2015, 22:08 

#15  
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masoudeh
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Thanks, 

March 25, 2015, 22:20 

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What didn't converge when you specified the injections? What initial conditions, mass flow rates etc have you specified for your injection streams?


March 25, 2015, 22:25 

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masoudeh
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the software gave me the error and stop it. i specify the mass flow rate , velocity temperature ( I assume these parameters the same as the fluid) and diameter of the particle for each single injection


March 25, 2015, 22:31 

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Specifically: did the solver crash/stop during the DPM calculations or the continuous phase iterations? What error was displayed?


March 25, 2015, 22:38 

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masoudeh
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after specific number of iteration it stopped, anyway i changed initial condition such as momentum pressure volume fraction and it could be helpful and it gave me the results. i just have problem with path lines which are not in the same pattern i expected! how can i work on that


March 25, 2015, 22:52 

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You can specify how many DPM iterations the solver does until it stops (the default is 500). If the particle stream hasn't escaped the domain within this number of iterations then this stream would be incomplete (finishes partway through the domain).
What path lines are you generating (show us a figure) and what are you expecting (show us another figure)? 

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