Post on 12-Dec-2021
ENGINE SIMULATIONS
Gilles Decan
DEPARTMENT ELECTRICAL ENERGY, METALS, MECHANICAL CONSTRUCTION & SYSTEMS
SUSTAINABLE THERMO-FLUID ENERGY SYSTEMS GROUP
FROM DIESEL TO DUAL FUEL
2
• Replace 90 – 95% of diesel by low-carbon alternative
- CH4 / CH3OH / H2
- Reduce emissions and CO2
- Retrofit
- Introduce renewable fuels (bio, e-fuels)
ENGINE DEVELOPMENT
3
• Development trough simulations
- Emission prediction
- Flow behaviour
- Heat transfer
- Spray modeling
- Combustion modeling
• Optimization of engine operation
- DF specific: ensure good combustion!
at entire operating range
OPENFOAM UTILITIES
4
• Engine simulations
- Piston movement
- Spray injection
- Auto-ignition, chemistry modeling
- Flame modeling and propagation
OF2.2.x: own solver (dual-fuel)
OF6: engineFoam (diesel only)
DIESEL ENGINE TUTORIAL
5
ENGINE MESH
• 40° Simplified sector mesh
- Create with blockMesh
6
Simplified
1
2
3
4
5
6
1 6, 2
4 5, 3
1, 4
5, 6
3, 2
RUNNING ON HPC
• qsub –I –pass=reservation=PRETREF –l nodes=1:ppn=10
• module load OpenFOAM/6-intel-2018a
• source $FOAM_BASH
• source $WM_PROJECT_DIR/bin/tools/RunFunctions
• tar –xzf DieselEngine.tgz
• cd DieselEngine
• blockMesh
• checkMesh
7
ENGINE SIMULATION SETUP
• Chemistry through chemkin
- constant/thermophysicalProperties
- change - investigate
• Define engine geometry
- constant/engineGeometry
8
• Spray injection + modeling- constant/sprayCloudProperties
- change - investigate
• Turbulence modeling- constant/turbulenceProperties
• Combustion model
- constant/combustionProperties
- change - investigate
ENGINE INITIALIZATION
• Species fields
- CO2/H2O/O2/N2/fuel
9
• Pressure,
temperature, U
• Turbulence
- k/epsilon
RUNNING ON HPC
• qsub –I –pass=reservation=PRETREF –l nodes=1:ppn=10
• module load OpenFOAM/6-intel-2018a
• source $FOAM_BASH source $WM_PROJECT_DIR/bin/tools/RunFunctions
• (blockMesh)
• decomposePar
• mpirun –np 10 engineFoam –parallel (> log &)
• reconstructPar
10
RESULTS
11
Pressure and HRR trace
Indicated Work
Temperature field
NOx emissions
RESULTS
12
DUAL FUEL RESULTS
13
Pressure and HRR trace
Temperature field
NOx emissions
DUAL FUEL RESULTS
14