We have an exciting announcement about badges coming in May 2025. Until then, we will temporarily stop issuing new badges for course completions and certifications. However, all completions will be recorded and fulfilled after May 2025.

Ansys Learning Forum › Forums › Discuss Simulation › Fluids › BCs for buoyant flow with outlet parallel to gravity vector › Reply To: BCs for buoyant flow with outlet parallel to gravity vector

April 19, 2024 at 10:17 pm
Daniel Thomas
Subscriber

Hi Ren,

Following up on this, with another question.  I ended up extending the domain in the y-direction to include the adjacent wall and sheath flow inlets, and repeated my mesh study to check the effect of refinement in the y-direction.  With a refined grid, I was able to see the expected slight upward shift in the flame with conditions of slow flow and exaggerated gravity.  Very nice to have that result -- and thank you for your help.

However, for flow rates corresponding to my experimental conditions, I am seeing peak temperatures almost 100 K higher than expected -- even with substantial grid refinement.  I'm solving the energy equation with volumetric reactions using an imported mechanism.  I've included the species transport inputs below.  I didn't find any tutorial exactly matching this.  Are you aware of any?  I'd be particularly interested in any that includes radiation for this gas-phase (no soot) flame. 

Â