4. dfSprayFoam

4.1. aachenBomb

Problem Description

This case simulates combustion inside a constant volume chamber based on an experimental setup at RWTH Aachen University. It can mimic, for example, the beginning of power stroke in a four-stroke diesel engine.

Operating Conditions in Brief

Chamber size (xyz)

0.02×0.1×0.02m^3

Initial Gas Temperature

800K

Initial Gas Pressure

5MPa

Initial Gas Composition (mass fraction)

23.4% O2, 76.6% N2

Fuel

n-heptane

Fuel Temperature at the Nozzle

320K

Fuel Injection Duration

1.25ms

Total Injection Mass

6mg

Configurations Different from OpenFOAM Case

Cantera is used instead of the built-in modules of OpenFOAM to solve the chemical reactions. Therefore, a chemical mechanism file in YAML format is required in the case directory, and the full name of the mechanism file (“xxx. YAML”) should be the entry after the keyword CanteraMechanismFile in constant/CanteraTorchProperties. Non-reacting simulation can be conducted by switching the entry after the keyword chemistry from on to off in constant/CanteraTorchProperties.

Results

../_images/aachenBomb.png