Numerical modelling of cellulose micro/nanofibril suspensions

Abstract eng:
A numerical tool for the simulation of Nano/Micro Cellulose fibre suspensions is developed by means of coupling of a Computational Fluid Dynamics code and a Discrete Element code. The 3D Navier-Stokes equations are solved by a finite volume scheme, and the fibres are discretised into a chain of beam elements. Momentum exchange between the two phases are enforced by a two-way coupling. Compared to the conventional ”prolate-spheroid” approximation [11] [12], we implement a hydrodynamic force model based on the drag of an infinite cylinder, as such a description of the hydrodynamic force tends to be free from the discretisation of the fibre. In the future work, it is planned to use the developed model for the simulation of dilute and dense NFC suspensions.

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