Free surface reconstruction method, device, equipment and medium

The invention discloses a free surface reconstruction method, device and equipment and a medium, and relates to the field of water-gas multiphase flow computation.The method comprises the steps that a first slope and a second slope of each grid in a free surface at the current moment are determined through a first single-valued function and a second single-valued function respectively; obtaining a first comparison relation between the first slope and the second slope, and determining first position information of target fluid in each grid; determining a target slope from the first slope and the second slope based on the first comparison relationship, obtaining a second comparison relationship between the target slope and a preset threshold, and determining second position information of the target fluid by using the first position information and the second comparison relationship; and calculating a volume fraction flux between every two adjacent grids by using the second position information so as to reconst