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Old   November 13, 2002, 10:03
Default Euler model
  #1
Bharath
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Hello Is Euler-Euler model ..a better way to model nozzle spray ?? or do we have any restrictions in it ? If someone finds an example or tutorial other than fluent to model Spray ..please provide me with the info.

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Bharath
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Old   November 13, 2002, 20:17
Default Re: Euler model
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Jin-Wook LEE
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As a my personal point of view, in general, DPM is better than spray model. However, mass flow rate of droplet(or particle) is very high, E-E model is preferred.

Let droplet mass flow rate, D, and gas mass flow rate, G.

In general,

D/G < 0.2, DPM without interaction between two phases.

D/G > 0.2, DPM with interaction between two phases.

The limitation of DPM is the ratio of volume flow rate, D_vol/G_vol about 0.1(10%)~0.15(15%). My personal experience, the ratio of mass flow rate, D/G exceeds 2~3, convergence has some problem.

So, E-E model is recommended for D/G >> 1.

Sincerely, Jinwook

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Old   November 14, 2002, 10:21
Default Re: Euler model
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Bharath
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Hello there Thanks for the reply.However,my problem includes inlet condition of water(as a continous medium ) and air mixing .DPM model would require liquid ( water) phase to be injected as Particles isnt it ??I would like to send the inlet Liquid not as particle but as a continuous flow until the air interacts with it and by its shear force forms droplets. I did find that ..If I use DPM model ,Im able to track only finite number of particles (which is equal to the GRID size at the liquid phase inlet ). But it is required that I wanna see water slowly disintegrating to form droplets and ...not like tracing the Water particles from the very beginning !

Awaiting ur reply

Thanks

Bharath
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Old   November 14, 2002, 22:46
Default Re: Euler model
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Jin-Wook LEE
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Then, it is very difficult(actually, impossible) to solve your problem by E-E model of current Fluent version.

Instead, Fluent has couple of special models for the prediction of droplet formation in DPM option of Fluent 6.0 or higher. I never tried one of these models but I felt that it's very nice.

Sincerely, Jinwook

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Old   November 24, 2002, 01:18
Default Re: Euler model
  #5
mahdi saniee nezhad
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Dear sir I have a problem with this title. If it's possible for you please send me your received responses. Very thanks for your attention to my request. With the best regards. Mahdi saniee nezhad

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