H208-08
Using Smoothed Particles Hydrodynamics to Simulate Melting and Mixed-Phase Scattering Properties
Wednesday, 16 December 2020: 11:58
Virtual
Craig Pelissier1,2, Kwo-Sen Kuo3, Stephen J Munchak4, William S Olson5, Adrian Loftus6, Stephen Joseph Munchak7 and Thomas Clune4, (1)NASA Goddard Space Flight Center, Computational and Information Science & Technology Office, Greenbelt, MD, United States, (2)Science Systems and Applications, Inc., Lanham, MD, United States, (3)University of Maryland, College Park, MD, United States, (4)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (5)Joint Center for Earth Systems Technology, Baltimore, MD, United States, (6)Earth System Science Interdisciplinary Center, COLLEGE PARK, MD, United States, (7)NASA Goddard Space Flight Center, Greenbelt, United States
Abstract:
Realistic particle distributions and their scattering properties are at the foundation of radiative models of precipitating systems. Today, particle databases like NASA’s OpenSSP provide scattering properties for an array of complex crystal and aggregate geometries. These databases have led to improved models and more accurate quantitative estimates of precipitati
on rates. An important addition to the databases is
the inclusion of mixed-phase
particle scattering properties. To generate
these properties, we simulate the melting process using Smooth
ed Particle Hydrodynamics and compute the scattering properties for different water fractions using the
discrete dipole approximation method.
Smoothed Particle Hydrodynamics (SPH) is a meshless Lagrangian method. It is capable of capturing the evolution of complex time-varying fluid-fluid and fluid-solid interfaces, and it incorporates thermo, fluid, and rigid body dynamics from first principles. These properties make it an ideal candidate for describing the melting process of precipitating particles. Here we present results of SPH applied to the melting of particles from the OpenSSP databases, discuss some of the challenges, and describe future plans for producing realistic mixed-phase scattering properties. The impact of mixed-phase particle spectra on the bulk single-scattering properties of stratiform melting layers, and its implications for combined radar-radiometer precipitation remote sensing from GPM are discussed in the talk “Single-Scattering Properties of Melting Precipitation for GPM Passive Microwave and Radar Remote Sensing Applications”.
