LDRD Seminar: Aug. 27, 2019
Physicist Ian Cloet (PHY) and Computational Climate Scientist Robert Jacob (EVS) will discuss their Laboratory-Directed Research and Development (LDRD) sponsored work at the LDRD Seminar Series presentation Tuesday, Aug. 27, 2019, at 12:30 p.m. in Building 212, Room A157. All are welcome to attend.
Visit the LDRD website to view upcoming seminars.
“Imaging Matter at the Femtoscale,” by Physicist Ian Cloet (PHY)
The strong interaction, which is described by a theory call quantum chromodynamics (QCD), is the least understood component of the Standard Model of Particle Physics. QCD describes how fundamental particles called quarks and gluons interact to form the vast bulk of all visible matter, e.g., protons, neutrons, and nuclei. A mysterious feature of QCD, called confinement, is that the quarks and gluons can never be observed in isolation and are always bound inside strongly interacting particles called hadrons, where the pion, proton, and neutron are the most important examples. Advances in theory have allowed us to define observables that provide 3-D images of the quarks and gluons bound inside hadrons and nuclei — in both coordinate and momentum space. These objects will soon be measured for the first time at, e.g., Jefferson Lab, and then with much greater detail at a future electron-ion collider. This talk will provide a snapshot of this physics, and illustrate how it will help answer some of the deepest questions in fundamental science: What is the origin of the mass of visible matter? How is the proton’s spin distributed between color-entangled quarks and gluons? How do nuclei emerge from the fundamental theory of the strong interaction (QCD)?
Ian Cloet is the Theory group leader in the Physics division. He received his Ph.D. from The University of Adelaide (Australia) in 2007; and held postdoctoral positions at Argonne National Laboratory, University of Washington, and The University of Adelaide. Cloet became staff at Argonne in 2013. His research is in the field of hadron physics, with a focus on the quark and gluon tomography of hadrons and nuclei.
“Better Models of the Urban Boundary Layer,” by Computational Climate Scientist Robert Jacob (EVS)
The urban boundary layer, that part of the atmosphere in cities and near the ground, is home to over half of the world’s population. And yet, it is one of the most poorly studied regions of the atmosphere. In weather and climate models, the effect of urban areas is heavily parameterized. We seek to make reference solutions of urban airflow that can be used to improve parameterizations in weather and climate models. Toward that end, a highly scalable open-source in-compressible and low-Mach-number CFD solver Nek5000 has been applied to realistic urban geometries. These simulations suggest we have the capability to resolve the flow in any city geometry assuming a proper mesh can be constructed. Extending these simulations to larger domains will be possible with upcoming exascale supercomputers while longer simulation times may still remain a challenge.
Robert Jacob is a computational climate scientist in the Environmental Science division and a scientist in the Argonne-University of Chicago Consortium for Advanced Science and Engineering. He received his Ph.D. in atmospheric science from the University of Wisconsin-Madison. Jacob leads the infrastructure group for the U.S. Department of Energy’s Energy Exascale Earth System Model. Throughout his career, he has been strongly involved in the development and application of global climate models. His current interests include applications of high performance computing to scientific problems, climate variability, urban climate, and long-term climate change.