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May 17, 2002, 17:25 |
modeling of coupled problem
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#1 |
Guest
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Dear all,
I am going to model a catalytic combustion process, which is used to burn off the trace amount of fugitive ethane. The case description are as below: (1) I have to use a hot gases from exsting burners , to raise the temp of my process, I planned to use a configuration like a double pipe heat exchanger, but the gases to be burnt will be entering from the side ^ ^ | | burnt gases out | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | < - gases to be burnt | | | | | | | | ^ | hot gases My problem is how can I couple the two flow in order to run the calc. , and how could I specify the heat transfer from the hot gases to the cold stream. I expect your suggestion/experience/thought to direct my modeling of this combustion process. I appreciate your time and expertise. Godfrey |
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May 18, 2002, 09:30 |
Re: modeling of coupled problem
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#2 |
Guest
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I suggest this method.
(1) Set the momentum and energy boundary conditions and turn off the "energy" equation in "solve->control". (2) Solve each flow field separately in a same geometry. An approach to solve this problem is to set one flow field as a solid part and solve the other field. Then export solved flow field data by the function "interpolate" in a Fluent solver. Thus, you can solve the other flow filed in a same manner.(change the solid type continuum and fluid type continuum) (3) Couple two flow field data in a same geometry and turn off the "flow" equation and turn on the "energy" equation in "solve->control". Then solve energy equation only. P.S. Above method is valid when there is no natural convection and flow field variables(velocity components) are not governed by temperature. |
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May 21, 2002, 13:24 |
Re: modeling of coupled problem
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#3 |
Guest
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In this case there is natural convection on outer fluid side as well as the temperature is very influential in flow field..
Godfrey |
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May 21, 2002, 22:04 |
Re: modeling of coupled problem
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#4 |
Guest
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Well, how about using "Profile file" in solver? Boundary condition at interface between two regions could be set after solving hot fluid region. Thus you can, I believe, solve the natural convection problem caused by hot fluid region which is spacially separated with cold fluid region.
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May 22, 2002, 15:52 |
Re: modeling of coupled problem
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#5 |
Guest
Posts: n/a
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Ok I will try this..
but could I use the inner wall as inteface where I can define my boundary condition or I should defined the new interface boundary condition..?? thanx for help |
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