A Spray Model for an Adaptive Mesh Refinement Code
Sara D. Bauman
Under the supervision of Prof. Christopher J. Rutland
At the University of Wisconsin-Madison
Abstract:
A spray model has been implemented into an existing low Mach
number, Navier-Stokes code utilizing adaptive mesh refinement. The
integration of a spray model with a fluid code possessing the ability to
control the resolution of the computational grid attempts to address the
problem of insufficient solution resolution when the cell size of fixed
grids is compromised in order to achieve reasonable run times in
high-pressure spray simulations.
The implementation of the spray model involves the creation and development
of a suitable data structure to store spray variables, routines to control
the behavior of the parcels of spray droplets, and routines to control the
interaction between the ambient fluid and the spray. The spray model
includes submodels for aerodynamic drag, droplet oscillation and
distortion, turbulence effects, droplet breakup, evaporation, and
droplet collision and coalescence. Special provisions for the
treatment of spray droplet parcels within the adaptive mesh refinement
framework have also been developed.
The performance of individual spray submodels has been validated by
comparing single grid results to theory and experimental results from
the literature. The performance of the complete spray model has been
explored by comparing results calculated using grid adaptation to
experimental results from the literature. The effect of adaptation on
spray simulation has also been explored and discussed.
dailey@cs.wisc.edu
Mon June 1, 1998