# modeling of coupled problem

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 May 17, 2002, 16:25 modeling of coupled problem #1 Godfrey Guest   Posts: n/a 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

 May 18, 2002, 08:30 Re: modeling of coupled problem #2 chiseung Guest   Posts: n/a 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.

 May 21, 2002, 12:24 Re: modeling of coupled problem #3 Godfrey Guest   Posts: n/a In this case there is natural convection on outer fluid side as well as the temperature is very influential in flow field.. Godfrey

 May 21, 2002, 21:04 Re: modeling of coupled problem #4 chiseung Guest   Posts: n/a 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.

 May 22, 2002, 14:52 Re: modeling of coupled problem #5 Godfrey Guest   Posts: n/a 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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