Author(s): Arman Rokhzadi; Musandji Fuamba

Linked Author(s): Arman Rokhzadi, Musandji Fuamba

Keywords: Ir pocket entrapment; Stormwater systems; Finite Volume method; Rigid Column model

Abstract: A modification to a previous shock tracking capturing approach used for simulating transient flows in stormwater systems has been proposed. The original approach is able to handle different situations occurring in stormwater systems. The objective of this paper is to improve the poor behavior of the original approach while preserving its abilities. The poor behaviors include overestimating peak values, underestimating the attenuation, and oscillatory behavior. Based on the Godunov-type finite volume method, this modified approach uses two governing equations for free-surface and pressurized flows. The free-surface flow is calculated explicitly, while the pressurized flow is discretized on one control volume and calculated implicitly. It will be shown that, as a result of the numerical dissipation of the implicit scheme, the proposed modification can improve the overestimated peak values and the underestimated attenuation of pressure distribution. In addition, it will be shown that the proposed modified approach exhibits less oscillatory behavior, particularly in simulating pipe-filling bore advancement.

DOI: https://doi.org/10.3850/IAHR-39WC252171192022436

Year: 2022