Week 9: Project 1 - Surface preparation and Boundary Flagging (PFI)
Objective
To make NO HYDRO case set up of an IC engine. Make boundary flagging and complete the whole set up in order to figure out if the Geometry moves correctly during the run.
Geometry
Boundary flaging
Piston head
inflow and intake port
outflow and exhaust port
liner
cylinder head
intake and exhaust valve
spark plug
As you see the valve is open (marked with the red lines), therefore we need a concept called "Disconnect triangles in order to avoid airflow between this little gap when the valve is considered to be closed. If the Disconnect triangles were not present then the simulation will underpredict mass flow in the combustion region. were not present then the simulation will underpredict mass flow in the combustion region.
we activate "disconnect triangles' with the "events".
Boundary Conditions:
Boundary Type - Wall
Piston Wall motion Translating
Surface Movement - Moving
Law of Wall (Piston Motion)
Temperature - 450K (Law of Wall)
liner Boundary Type - Wall
Wall motion - Stationary
Surface Movement - Fixed
Law of Wall
Temperature - 450K (Law of Wall)
cylinder head Boundary Type - Wall
Wall motion - Stationary
Exhaust Port Surface Movement - Fixed
Law of Wall
Temperature - 450K (Law of Wall)
Boundary Type - Wall
Exhaust port Wall motion - Stationary
Surface Movement - Fixed
Law of Wall
Temperature 500K (Law of Wall)
Intake port Boundary Type - Wall
Wall motion - Stationary
Surface Movement - Fixed
Law of Wall
Temperature 425K
Intake port2 Boundary Type - Wall
Wall motion - Stationary
Surface Movement - Fixed
Law of Wall
Temperature 425K
Spark plug Boundary Type - Wall
Wall motion Stationary
Surface Movement - Fixed
Law of Wall
Temperature - 550K
Spark plug terminal Boundary Type - Wall
Wall motion - Stationary
Surface Movement - Fixed
Law of Wall
Temperature - 600K
intake valve Boundary Type - Wall
Wall motion - Translating
Surface Movement - Moving
Law of Wall
Temperature - 480K
Profile - loaded
Minimum Lift - 2e-4m
Exhaust valve Boundary Type - Wall
Wall motion - Translating
Surface Movement- Moving
Law of Wall
Temperature - 525K
Profile - loaded
Minimum Lift - 2e-4m
Inflow Boundary Type - Inflow
Temperature-363K
Pressure - 101325 Pa
Species - Air
Outflow Boundary Type - Outflow
Temperature- 800K
Pressure - 101325 Pa
Species CO2 -0.192304
H200.088559
N2-0.719137
Regions and initialization
As we intend to simulate NO HYDRO in this challenge we just set the base grid size to be
4mm in order to simulate the case faster, we don't use fixed embedding or AMR in this chapter of the project. Mesh will be refined in the FULL HYDRO
case.