A vortex breakdown can be said to have occurred at the location where the vortex was previously present.
As a result, the slow-moving boundary layer becomes more dominant and is probably responsible for the vortex breakdown, flow reversal and separation as observed on the diffuser ramp surface.
But for the current study, the complex vortex pattern and its interaction with the boundary layer should be simulated accurately to find the possible vortex breakdown or boundary layer separations inside the duct; therefore, using a less dissipative scheme like the second-order upwind is a requirement.
The passage between ridge and inlet should let the vortex pass away safely, and any vortex breakdown should happen after this passage.
is evident above 2 km AGL, as indicated by the appearance of tightly coupled vortices rotating about the central axis clearly visible between 2 and 4 km AGL.
At 80 CAD BTDC the increased mixing process due to tumble vortex breakdown starts.
Looking at the time span of the tumble vortex breakdown from 80 CAD BTDC to TDC it is clearly visible that turbulent diffusion leads to a fast mixing process.
There are four mechanisms that may result in flame flashback [7, 9-11]; upstream flame propagation of coherent structures and boundary layer flame propagation in particular are symptomatic of combustion induced vortex breakdown
This cavitation results in vortex breakdown
near the orifice and generation of very fine bubbles.
Vyas y Majdalani (2003) indican que entre los aspectos relevantes del flujo en torbellino que aun requieren mayor investigacion y analisis se encuentran los fenomenos conocidos como rompimiento del vortice (vortex breakdown
) y el flujo axial inverso inducido, este ultimo es el tema que se analiza en el presente trabajo.
The phenomena are very complex as many physical, time and chemical scales are involved, therefore turbulent combustion instabilities multiscale 4D problems (space and time), like vortex breakdown
and vortex precessing core [3, 4], appear.
Downward moving wind and temperature anomalies associated with rapid vortex breakdown
appear to influence the Jet Streams and project strongly onto the AO.