anaerobic biogas digester modelling
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Anaerobic Biogas Digester Modelling
Using OpenFOAM and Fluent
Andrew CoughtrieCivil Engineering
Biogas Digestion?
Problem Definition• Waste Treatment
• Mixing effectiveness
• Failure when scaled up
• Difficult to monitor experimentally
* Karim k. et al. [2007] Gas-lift Digester Configuration Effects on Mixing Effectiveness
Experimental bench scale internal airlift loop biogas digester.*
CFD• Structured square mesh• Ansys Meshing and
BlockMesh• Approximation for inlet
boundaryInlet
Slurry Surface
Outlet
Walls
Problem Setup• Inlet boundary condition based on approximation of flow
velocity• RNG k-epsilon turbulence model
• Zero shear wall at surface
OpenFOAM Control
Function to monitor velocity
Discretisation Schemes
Linear solver
Fluent Wall TreatmentStandard Wall
FunctionsScalable Wall
FunctionsEnhanced Wall
Treatment
Fluent vs. OpenFOAM
OpenFOAM Fluent
*Karim k. et al. [2004] Flow Pattern Visualization of a Simulated Digester
OpenFOAM Fluent Experimental*
Single-phase vs. Multiphase
DPM Single-Phase
Ongoing Work
• Non-Newtonian fluid modelling
• Comparison between single and multiphase for OpenFOAM and Fluent
• Multiphase 3D modelling
• Euler-Euler Multiphase using OpenFOAM
Three-Dimensional
• Full 3D geometry for DPM
• Import mesh to OpenFOAM for use with bubbleFoam
?Questions?