Plume Collapsing Predictor

Collapsing probability is the main predictor score. It rises only when downstream sections both close the center-surrounding ring strongly enough and block or strongly choke ambient access to that center region.

Thermodynamic regime tells you whether the case is non-flash, transitional flash boiling, or flare. The card also shows Zeng D, a normalized plume-distance indicator: values near 1 mean plume spacing is still relatively open, while values near 0 mean the thermodynamic branch is pushing the plumes toward a strongly merged state.

Pa/Ps is the ambient-pressure to saturation-pressure ratio. The line below it shows the inverse ratio Ps/Pamb.

Plume angle is the cone-spread angle currently used to grow each plume section in the geometry model. The line below the value tells you which branch supplied that angle.

Minimum gap, overlap onset, and vent details still exist, but they are now shown in Gap Diagnostics instead of this top summary.

The gap plot tracks the smallest pairwise plume gap through the full axial window. Negative gap means explicit overlap.

The fixed-plane table summarizes each monitored section at 5, 10, 15, 20, and 50 mm.

Open path asks whether ambient gas can still reach the center region at that plane.

Vent blocked asks whether the sampled center ring is closed enough to support enclosure and, at the same time, the center region has no usable path or only a severely choked one.

Best vent throat is the strongest center-reaching ambient path found in that section. Small values matter only when the center-surrounding ring is also mostly closed.

Ring closure measures how much of the sampled center ring is closed by plume material. Large overlap without ring closure is not enough.

Max open arc measures the largest remaining open sector on the sampled center ring. A large open arc usually means ambient gas still has a clear way in.