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-   -   DPM injection (http://www.cfd-online.com/Forums/fluent/45128-dpm-injection.html)

ritmat June 22, 2007 06:36

DPM injection
 
HI, I am trying to model injection of flyash in boiler with flue gas. I want as well to use the erosion model. My particule are inert and doesnt affect the flow so it is one way coupling. But to use erosion model i need to enable two way coupling. So i am wondering when i enable this option and run only once, is my trcak particule correct or do i need to itereate more but in this case the particules will probably intereact with the flow? Thanks for your answer


Allan Walsh June 22, 2007 13:21

Re: DPM injection
 
The particle influence in the flow should be small.

ritmat June 25, 2007 06:29

Re: DPM injection
 
My question was more , do i need to iterate in this case or just run the particle track? Actually i run my injection from a file. It looks like it can see my injection but all particle are lost? any idea? I am as well wondering, what should be the unit for the dpm file? mine is in meter, but my unit case in fluent is mm?

that is what is written on the consol after particle tracking: DPM Iteration .... Reading injections from file:I:\fluent\SH2only\inlet.dpm. Number of injections read in=2910 Reading injections from file:I:\fluent\SH2only\inlet.dpm. Number of injections read in=2910 Reading injections from file:I:\fluent\SH2only\inlet.dpm. Number of injections read in=2910 Reading injections from file:I:\fluent\SH2only\inlet.dpm. Number of injections read in=2910 Reading injections from file:I:\fluent\SH2only\inlet.dpm. Number of injections read in=2910 Reading injections from file:I:\fluent\SH2only\inlet.dpm. Number of injections read in=2910 Reading injections from file:I:\fluent\SH2only\inlet.dpm. Number of injections read in=2910 Reading injections from file:I:\fluent\SH2only\inlet.dpm. Number of injections read in=2910

lost 2910 new injected particles on last node number tracked = 0, escaped = 0, aborted = 0, trapped = 0, evaporated = 0, incomplete = 0 Parallel particle tracking concurrency: 0%

thanks for the help

ritmat June 25, 2007 09:47

Re: DPM injection
 
I succeed finally. The position has to be in meter eventhough my case was running with mm. I give simple example for those later which can have like me difficulties with the syntax:

(X Y Z U V W diameter T mass-flow) name) ((9.0000e+000 2.0000e+000 -3.7250e+000 0.0000e+000 0.0000e+000 8.1400e+000 0.1000e+000 1.0000e+003 0.0100e+000) injection-0:0) (...)

hope it will help


rana June 25, 2007 16:09

Re: DPM injection
 
dear ritmat,

u r using gas and solid. as u know, i have similar system but for different objective. when i give the default values of Fluent tutorial (which is for liquid-solid) for my gas-solid system; i get lots of particles as ABORT.

can u tell me please what are the values of : Normal restituion coefficients, tangential restitution coeffcients, erosion (is it piecewise-linear u r using) velocity exponent diameter function value

i would liek to use ur values atleast to run the case for the time-being. pls help me as i am not able to proceed because of this abort.

best regards,

rana


ritmat June 26, 2007 01:25

Re: DPM injection
 
i Rana, for this values , i am using those in the tutorial which are actually quite what i needed in my case after checked it in a book. But for me it is flyash particule which erode pipes. So it is particule on a solid an not gas on a solid. So in my case it is the same values use in the tutorial of fluent which is impimgment of particules on 3D channels. Hope i answer to your question


rana June 26, 2007 02:38

Re: DPM injection
 
thank u so much henri :)



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