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Anaerobic Biogas Digester Modelling

Anaerobic Biogas Digester Modelling. Using OpenFOAM and Fluent. Andrew Coughtrie Civil Engineering. Biogas Digestion?. Problem Definition. Waste Treatment Mixing effectiveness Failure when scaled up Difficult to monitor experimentally.

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Anaerobic Biogas Digester Modelling

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  1. Anaerobic Biogas Digester Modelling Using OpenFOAM and Fluent Andrew Coughtrie Civil Engineering

  2. Biogas Digestion?

  3. Problem Definition • Waste Treatment • Mixing effectiveness • Failure when scaled up • Difficult to monitor experimentally Experimental bench scale internal airlift loop biogas digester.* * Karim k. et al. [2007] Gas-lift Digester Configuration Effects on Mixing Effectiveness

  4. CFD Slurry Surface • Structured square mesh • Ansys Meshing and BlockMesh • Approximation for inlet boundary Inlet Outlet Walls

  5. Problem Setup • Inlet boundary condition based on approximation of flow velocity • RNG k-epsilon turbulence model • Zero shear wall at surface

  6. OpenFOAM Control Linear solver Discretisation Schemes Function to monitor velocity

  7. Fluent Wall Treatment Standard Wall Functions Scalable Wall Functions Enhanced Wall Treatment

  8. Fluent vs. OpenFOAM OpenFOAM Fluent *Karim k. et al. [2004] Flow Pattern Visualization of a Simulated Digester

  9. Fluent OpenFOAM Experimental*

  10. Single-phase vs. Multiphase DPM Single-Phase

  11. Ongoing Work • Non-Newtonian fluid modelling • Comparison between single and multiphase for OpenFOAM and Fluent • Multiphase 3D modelling • Euler-Euler Multiphase using OpenFOAM

  12. Three-Dimensional • Full 3D geometry for DPM • Import mesh to OpenFOAM for use with bubbleFoam

  13. ? Questions?

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