Mechanical Engineering ETDs

Publication Date

Summer 7-15-2022

Abstract

In this study, the interaction of a shock with various gas and particle interfaces is analyzed through simulations using a new, GPU capable, multi-species flow solver, FIESTA (Fast, Interface Evolution, Shocks, and Transport in the Atmosphere), de- veloped for this research. The cases studied include the interaction between a shock and i) a two-dimensional (2D), circular cloud of a dense gas; ii) a 2D curtain of a dense gas; iii) a three-dimensional (3D) cylinder of a dense gas, and iv) a 3D curtain of solid particles.

In simulations of a 2D gas curtain and a 3D gas column, the curtain and column were inclined with respect to the shock. In such flow geometries a shock-driven Kelvin-Helmholtz instability (SDKHI) develops on the curtain/column surface as observed in experiments. Additionally a perturbation develops near the foot and head of the curtain/column. In this study, these phenomena, observed in experiments, are confirmed numerically for the first time.

Using simulation data, the effects of varying Mach number, initial angle and curtain/column width are explored in detail for 2D flows with inclined curtains and 3D flows with inclined columns. This work also examines the effect of SDKHI on various mixing characteristics for 3D flows with an inclined column. FIESTA is then extended to include Lagrangian particle transport capabilities and the particle mechanism is validated against experimental data.

Performance characteristics of FIESTA are also compared on several computa- tional platforms utilizing CPU and GPU architectures. Exceptional performance is demonstrated on GPU clusters with speedups over 77X.

Keywords

shock, instability, turbulence, particle, gpu

Degree Name

Mechanical Engineering

Level of Degree

Doctoral

Department Name

Mechanical Engineering

First Committee Member (Chair)

Professor Svetlana Poroseva

Second Committee Member

Professor Peter Vorobieff

Third Committee Member

Professor Daniel Banuti

Fourth Committee Member

Dr. Jon Reisner

Fifth Committee Member

Professor Daniel Banuti

Document Type

Dissertation

Language

English

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