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Modeling Furnace Air Flow

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Old   April 4, 2019, 10:16
Default Modeling Furnace Air Flow
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Elísio Possamai Filho
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Hi,
I am a new user of Fluent (ANSYS R1) and i am reading some Fluent Guides and Tutorials (i appreciate content sharing). Since i am a begginer, i started it simple, adding new situations and i aim to make it more complex (add combustion at entrance).

About my simulation: I want to model the temperature flow lines inside a furnace, changing the inclination of secondary air entrance to produce different levels of turbulance.

https://uploaddeimagens.com.br/image...png?1554383491

So in first off all, i designed only Half structure to reduce computating calculation:
1. Question: Will my input parameters change, since my inlet and outlet areas are different half now?

• I had turn on energy and turbulance k-epsilon.
• B.C.:
o Inlet Air (velocity-inlet): velocity, T (and P for Pressure-oulet)
o Inlet Secondary air (velovicty-inlet): velocity and T (i didnt set P)
o Wall Fluid (wall): Steel, Wall Thickness and Convection
o Outlet: P for Pressure-oulet. 2. Question: Should i use Outflow or Pressure-Outlet at Outlet? I have read about these 2 options, but i havent understand what to choose here.
• Method: 3. Question i don’t know what to set here!!! (i’d like comments and content sharing)
o Coupled, Least Square Cell Based, Second Order, Second Order Upwind, First Order Upwind, First Order Upwind. And PseudoTransient
o Hybrid Initialization


Below i show you the flow difference using Outflow and Pressure-Outlet:
Considering the Air Flow Lines are from only Inlet Air (i hid the secondary air).
At Pressure-Outlet we can see the secondary air comes deep inside but at outlet there is OUTSIDE AIR (blue part) ENTERING INSIDE THE FURNACE OUTLET REGION (it doesnt happen). After the heat transfer this Air goes to another equipment! How can i fix this???????????

https://uploaddeimagens.com.br/image...sureoutlet-png

At Outflow:

https://uploaddeimagens.com.br/image...png?1554383250



Thanks.

Last edited by elisioo; April 4, 2019 at 14:00.
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cfd analysis, flow 3d, furnace, setup fluent

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