Fig. 8.
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Space–time evolution of a bipolar isobaric perturbation in LEGOLAS-IVP. Perturbation density ρ1 (left), temperature T1 (centre), and velocity v1 (right). The positive-temperature pulse (left half) drives runaway heating and rarefaction, while the negative-temperature pulse (right half) drives runaway cooling and condensation, illustrating how the sign of the initial perturbation selects between the two branches of thermal instability (Sect. 3.4).
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