Predicting density wave amplification of settling slurries using a 1D Driftux model

A 1-dimensional-two-layer transient drift-flux model for hydraulic transport pipelines: modelling and experiments of bed layer erosion and density wave amplification

“…horizontal and vertical. This was encountered in the "Freiberg" experiments (de Hoog et al, 2022) and referred to as "transient accumulation. " The key characteristic of this mechanism is, that these density waves can form despite that the pipeline operates far above the deposit limit velocity.…”

“…The shear stresses, axial dispersion coefficient 𝜖 and pump source term 𝑆 are modelled exactly the same way as with the 1D Driftflux model covered by de Hoog et al (2022). The relative particle velocity 𝑢 / in vertical sections of the grid is modeled differently.…”

“…This approach also allows for the ability to simulate pipeline blockages, when the density waves grows to large and forms a plug. A similar approach was used with the 1D Driftflux model in de Hoog et al (2022). Validation of the pressure driven mode of the 1D-2L model will be conducted in the future.…”

“…In the case of waves formed by transient accumulation, a new transient 1-dimensional Computational Fluid Dynamics (CFD) Driftflux model was developed to predict density wave amplification by de Hoog et al (2022). This type of 1D CFD is very powerful, as it allows the simulation of kilometers long pipelines in a matter of minutes on a decent laptop computer.…”

“…The aim of this article is to explore the possibility to model density waves due to the erosion-sedimentation imbalance, using 1D CFD. We propose to extended the 1D model by de Hoog et al (2022) with a second lower layer, to be able to model the erosion and sedimentation process between the suspended particles and the bed layer. The second lower layer models a stationary bed, while the upper layer models the suspended particles.…”