Abstract: The conventional approach to quantifying the added mass of a parachute relies on the premise of an optimal canopy configuration，necessitating the utilization of empirical formulas and coefficients for analysis.Nevertheless，the procedure to identify the added mass is not addressed.A joint simulation scheme is established to facilitate fluid-solid interaction simulation and the calculation of added mass for the disk-gap-band parachute.Correspondingly，a canopy reconstruction strategy is provided for determining the shape of the disk-gap-band parachute and a novel methodology is proposed for the numerical computation of the added mass associated with intricate geometries. The results indicate that through the range of dimensionless inflation time from 0 to 0.6，the increase in added mass of a single disk is equivalent to the aggregate of the parachute.This observation aligns with the mathematical model obtained from established empirical formulas. Following this，a model of a cup with gap is provided that accurately represents the added mass of parachutes at specific time intervals.Correlations are established between the gap structure and other factors such as the height-to-radius ratio，with the aim of deriving a modified empirical formula for predicting the added mass in disk-gap-band parachutes under diverse operational circumstances.The results show that the modified formula is helpful to improve the calculation accuracy of the dynamics simulation in supersonic conditions during the disk-gap-band parachute inflation stage.The research can provide support and reference for the high-precision modeling and analysis for the inflation process of the disk-gap-band parachute.

Key words: added mass, canopy reconstruction, disk-gap-band parachute, fluid-structure interaction, cup with gap model