Fig. 1. The effect of the Reynolds number on the evolution of interfacial patterns in the immiscible RT instability: (a) ; (b) ; (c) ; (d) .

Fig. 2. The effect of the Reynolds number on the dimensionless bubble and spike amplitudes.

Fig. 3. The effect of the Reynolds number on the dimensionless bubble and spike velocities.

Fig. 4. The curves of the early-time bubble and spike amplitudes with different Reynolds numbers, where the data points and solid lines are the statistical and fitting results.

Fig. 5. The curves of dimensionless bubble and spike accelerations at a high Reynolds number, and the red and blue solid lines are 0.045 and 0.233.