1. A multi-component two-phase flow algorithm for use in landfill processes modelling.
- Author
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White, J.K., Nayagum, D., and Beaven, R.P.
- Subjects
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TWO-phase flow , *LANDFILLS , *MATHEMATICAL models , *SOLID phase extraction , *CHEMICAL equilibrium - Abstract
This paper describes the finite difference algorithm that has been developed for the flow sub-model of the University of Southampton landfill degradation and transport model LDAT. The liquid and gas phase flow components are first decoupled from the solid phase of the full multi-phase, multi-component landfill process constitutive equations and are then rearranged into a format that can be applied as a calculation procedure within the framework of a three dimensional array of finite difference rectangular elements. The algorithm contains a source term which accommodates the non-flow landfill processes of degradation, gas solubility, and leachate chemical equilibrium, sub-models that have been described in White and Beaven (2013). The paper includes an illustration of the application of the flow sub-model in the context of the leachate recirculation tests carried out at the Beddington landfill project. This illustration demonstrates the ability of the sub-model to track movement in the gas phase as well as the liquid phase, and to simulate multi-directional flow patterns that are different in each of the phases. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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