Category: Past Seminars

 

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Weather Forecast and Climate Models in Today’s World
Published: September 29, 2023

Abstract: Weather Forecast and Climate Models, often referred to as General Circulation Models (GCMs), play pivotal roles in modern society, impacting various sectors, from everyday planning to aviation and national defense. This presentation explores the multifaceted significance of GCMs, both scientifically and economically. Economically, accurate weather and climate predictions yield an annual economic benefit exceeding […]

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Physics-Informed Learning of Melt Pool Dynamics in Metal Additive Manufacturing
Published: September 14, 2023

Abstract: Metal additive manufacturing (AM), e.g., laser-based powder bed fusion (L-PBF), offers an enabling opportunity for making complex metal parts or customized alloys with design freedom. The unique thermal cycle of rapid heating, fast solidification, and melt-back during metal AM may cause very complex metal pool dynamics, such as steep temperature gradient and high cooling […]

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SpaceChiller: DARPA heat sink technology to enable unprecedented performance of thermoelectric cooling in commercial aerospace systems
Published: September 11, 2023

Abstract: Thermoelectric coolers (TECs), also known as Peltier coolers, are solid-state cooling devices powered by a direct (dc) current. They offer high reliability, silent operation, and do not require the use of refrigerant chemicals that can be harmful to the environment. However, TEC performance is generally limited as compared to traditional vapor-compression refrigeration systems and […]

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Lightning Talks: Meet Our Faculty
Published: August 30, 2023

Three ME faculty will present their research. Come and learn about their exciting research, ask questions, and learn about research opportunities. Prof. Mihai “Mishu” Duduta obtained his B.S. degree from the Massachusetts Institute of Technology in Materials Science Engineering and received his M.S. and Ph.D. degrees in Engineering Sciences from Harvard University. While at MIT […]

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Energy and Emissions in the Built Environment: A Grand Challenge
Published: April 12, 2023

Abstract: The construction and operation of buildings contribute massively to global energy use and greenhouse gas emissions; therefore, buildings will play a central role in the path toward a sustainable, net zero, clean energy future. This presentation will give a high-level framing of buildings’ role in the 21st century energy challenge, as well as associated […]

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Open Access Benchmark Datasets and Metamodels for Problems in Mechanics
Published: April 6, 2023

Abstract: Metamodels, or models of models, map defined model inputs to defined model outputs. When metamodels are constructed to be computationally cheap, they are an invaluable tool for applications ranging from topology optimization, to uncertainty quantification, to real-time prediction, to multi-scale simulation. In particular, for heterogeneous materials, metamodels are useful for exploring the influence of […]

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In-vitro microfluidic characterization of sickle cells challenged by repeated hypoxia cycles and mechanical fatigue
Published: April 6, 2023

Abstract: Sickle cells are known for their significantly shortened lifespan (10-20 days), which is much shorter than the lifespan (~120 days) of the normal red blood cells (RBCs). Similar to normal RBCs, sickle cells are also challenged by repeated hypoxia cycles as well as mechanical fatigue. To examine the impact of these repeated challenges toward […]

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An Isogeometric Approach To Immersed Finite Element Analysis with Applications to Level-Set Topology Optimization
Published: March 14, 2023

Abstract: Topology optimization has emerged as a promising and powerful approach to design engineered materials and components. Initially restricted to two-phase, solid-void design problems in linear elasticity, topology optimization approaches for multi-physics and multi-material problems have emerged. These problems are often dominated by interface phenomena, such as contact and delamination at material interfaces and boundary […]

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Embedding Physical Intelligence in Soft Active Materials through Stimuli-Responsive Phase Transformation: from Photomechanical Actuation to Thermo-switchable Adhesion
Published: March 14, 2023

Abstract: The emerging economic and societal needs such as advanced manufacturing, environmental treatment, and space exploration call for machines that can operate in harsh and complex environments. An attractive approach is to utilize a new paradigm of physical intelligence in material development: a rational material design will enable its on-board actuation, sensing, and analysis, without […]

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Atomistic simulations to develop novel materials and understand their behavior
Published: March 1, 2023

Abstract: The properties of materials are highly dependent on their structures, which include morphologies, grain boundaries, phases, atomic structures, Etc. In particular, the atomic structures determine the limit of their properties, which are the unique characteristics of each material. However, predicting physical properties and understanding their origins demand accurate electronic structure and atomic structure calculations, […]

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Exploring the Multiphysics of the Brain during Development, Aging, and in Neurological Diseases
Published: February 20, 2023

Abstract: The human brain undergoes a myriad of changes during its lifetime. From a mechanics perspective alone, it is mesmerizing how the brain develops during early life, transforms into this highly functional, albeit still very enigmatic, organ that makes us unique, and is subjected to injury, disease, and ultimately age-related degeneration like every other part […]

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Multi-scale modeling and neural operators
Published: February 15, 2023

Abstract: The behavior of materials involve physics at multiple length and time scales: electronic, atomistic, domains, defects, etc.  The engineering properties that we observe and exploit in application are a sum total of all these interactions.  Multiscale modeling seeks to understand this complexity with a divide and conquer approach.  It introduces an ordered hierarchy of […]

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Compressible Convection in Planetary Mantles: a Comparison of Different Models
Published: February 13, 2023

Abstract  In numerical modeling of planetary and stellar convection, taking into account compressibility effects is crucial. However, using the exact equations may not be feasible due to the generation of fast acoustic waves, which distract from the slower convective motions caused by buoyancy. The Oberbeck-Boussinesq model simplifies the calculations by suppressing the acoustic waves making it […]

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Characterizing high-Reynolds number turbulence dynamics using low-Reynolds number flows
Published: February 13, 2023

Abstract: Turbulence is ubiquitous in natural and engineering systems. It can suppress energy loss in fusion reactors, affects stellar formation, has first order effects on processes critically important to society such as mixing of chemicals and pollutants in the atmosphere and oceans, climate dynamics and high-speed flight. It is therefore critically important to develop fundamental […]

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Enhancing the Appeal of Thermally Driven Energy Systems: From Synthesis to Demonstration
Published: February 2, 2023

Abstract: The current energy infrastructure is dominated by the combustion of the finite resources of fossil fuels leading to the release of more than 35 billion tons of carbon dioxide (CO2) per year and, in turn, environmental concerns that are intensifying every year. Therefore, there is an urgent need to manage the available primary energy […]

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Cloud system large-eddy simulations at NASA GISS
Published: January 23, 2023

Abstract: The most recent round of climate model physics development at the NASA Goddard Institute for Space Studies (GISS) relied heavily on a library of large-eddy simulation case studies that served as observationally informed benchmarks for the ModelE3 climate model in single-column model mode. Parameter uncertainties were then inputs to an atmosphere-only multi-parameter tuning against […]

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Topological metamaterials and the quest for floppy edges that can trap waves
Published: January 23, 2023

Abstract: Elastic metamaterials are structural materials that owe their unique wave manipulation capabilities to their complex internal architecture. Topological metamaterials are a special subclass of metamaterials whose behavior is directly controlled by the topology of their phonon bands. In this talk, I discuss the mechanics of a class of metamaterials known as topological Maxwell lattices. […]

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Strategies for tackling the computational cost of modeling reacting fluids and related problems
Published: January 19, 2023

Abstract: Accurate simulations of combustion and reacting fluid flows require complex, multi-step chemical kinetic models for describing the coupled chemical reactions. These models are often large and mathematically stiff, and contribute to the overall high computational expense of simulating practical phenomena relevant to energy, transportation, and aerospace applications. In this talk, I will introduce these […]

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Notes from a dissertation study on using Kansei Engineering methodology in Product Design Process
Published: January 16, 2023

Abstract: Kansei Engineering (KE) is a method designed by Mitsuo Nagamachi in the 1980s to translate consumers’ feelings and perceptions of a product (Kansei) into design elements. Its applications are used for new product development cases commonly in the automotive, construction machinery, electric home appliances, office machinery, house construction, costume and cosmetic industries (Nagamachi, 2002).  […]

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Electro-Chemo-Mechanics in Solid-State Batteries
Published: November 14, 2022

Abstract: The future of e-mobility, including electric vehicles, aircraft, ships, depends on the innovation of battery technology today. Since the energy density of conventional lithium (Li)-ion battery cells with graphite and metal oxides electrodes is limited to about 300 Wh/kg at the cell level, “next-generation batteries” such as the Li-metal all-solid-state batteries (Li-ASSBs) are demanded. […]

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