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-   -   two phases problem (http://www.cfd-online.com/Forums/fluent/30437-two-phases-problem.html)

zhaofei October 27, 2002 19:22

two phases problem
 
my problem is about two phases flow:in a extenal circulate reactor,the reactor is filled with some water,then the air spray into the reactor from the bottom,the water is moved follow the air. now i use the eulerian-eulerian model to simulate the experiment.but the result is not fit the fact:in the experiment,the water can circulat at a low air velocity( 4m/s ),but in the simulation,the water won't circulat until the air velocity reach 19m/s. now i cound't find what's wrong with me ,i am so anxious for your help!!!

Laika October 28, 2002 05:28

Re: two phases problem
 
How long did you let the simulation ran? I can immagine it will take a very long time until the airflow of 4m/s has caused the water to flow.

What water-velocities do you have in your experiment with the v_air=4m/s?

Laika, still orbiting

zhaofei October 28, 2002 11:09

Re: two phases problem
 
thank you very much!!! 1. the initial velocity of water is set to 4m/s,as the air volume fraction is 1,the water doesn't take effect. 2. the compute time is over 24 hours,i stop it because the residuals is not reduce,it run in the range 0.01 and 0.001,and never under 0.001.the following is my BC: inlet: air 4m/s,vof-air=1,intensity=0.04,

water 4m/s,intensity=0.04 outlet:presure outlet standard k-E model,per-phases,standard wall function,

sincere

zhaofei

Laika October 29, 2002 04:42

Re: two phases problem
 
Can you give some more detail abou the problem and the geometry.

Is de mash quality ok?

What time-step do you use?

Laika, still orbiting

zhaofei October 29, 2002 11:57

Re: two phases problem
 
well,thank you! i will send you a email with an attachment to dictate the problem in detail,i am appriciate for your help.

sincere

zhaofei


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