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BCs for buoyant flow with outlet parallel to gravity vector |
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February 16, 2024, 11:17 |
BCs for buoyant flow with outlet parallel to gravity vector
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Daniel Thomas
Join Date: Mar 2020
Posts: 10
Rep Power: 6 |
I have been unable to see the effects of buoyancy on a flame simulation, although the case is chosen as one for which buoyancy should be significant (Fr ≈ 0.3, where the Froude number is the ratio of inertial to gravitational forces). The flow and flame results are approximately what I expect from 1D simulations, but there is no change to the vertical flame position with gravity on or off. I get a slightly different flame position with the outflow and pressure outlet boundary conditions, but no change with gravity for either one. I've also been able to show buoyancy effects within a domain with only horizontal outlets, but this vertical (parallel to gravity) outlet seems problematic.
I'm new to Fluent, and would be grateful for any suggestions on possible problems with boundary conditions or elsewhere. The flow and temperature for this counterflow diffusion flame are shown below.
Simulation overview:
Boundary condition details:
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