CELS All Hands We are thrilled to invite you to the CELS All Hands meeting on Tuesday, June 4th at 10:00 a.m. Join us to hear exciting updates and valuable insights. ~Coffee and Donuts will be available~. Agenda: CELS directorate updates – Mike Papka, Deputy Associate Laboratory Director | Director, Argonne Leadership Computing Facility EVS update – Cristina Negri, Director, Environmental Science Division BIO update – Dion Antonopoulos, Director, Biosciences Division Digital twins initiative – Todd Munson, Senior Computational Scientist, Mathematics and Computer Science Division Safety update – ESH Team

CELS Women Lunch

• Lois McInnes (MCS)

Please join us on Tuesday, June 4, 12 - 1 pm CT (building 241, room A323, also Zoom). All technical women, collaborators, students, visitors, alumnae are invited to bring lunch and spend the hour chatting with others. History and plans going forward: The CELS-women group was established in 2003. The goal is not to compete with WIST activities but rather to complement those broader events with CELS-specific opportunities. We generally meet informally a few times per year. At a minimum, we want to provide regular opportunities for informal interaction so that technical women in CELS get to know one another.

Automated External Defibrillator (AED) Training for CELS employees AED Training Sessions are being offered by Argonne Fire Department. 10-Minute Hands-on AED Training Sessions. Swing on by and learn how to operate these life saving devices!

BIO All-Hands Meeting

• Dionysios A. Antonopoulos (Biosciences Div.)

MCS Postdoc Meeting

• Valerie Taylor (MCS)

MCS All-Hands Meeting

• Valerie Taylor (MCS )

Challenges and Advancements for GPU-Accelerated Discontinuous Galerkin Solvers for Multi-Physics, Compressible Flow Simulations

• Umesh Unnikrishnan (LCF)

CPS Hosted Seminar The emergence of GPU-accelerated hardware in high-performance computing (HPC) systems has significantly enhanced our capability to perform high-fidelity simulations, enabling the inclusion of increasingly complex physics models. This talk presents the development and optimization of a compressible Navier-Stokes solver based on the high-order spectral element discontinuous Galerkin (DG) method that is portable across GPU-accelerated HPC systems. We explore the integration of multi-physics modeling capabilities into the solver, including shock capturing techniques, multi-species transport, and chemically reacting flows. The presentation will cover the inherent challenges associated with these high-order numerical schemes and physics models, such as handling discontinuities and ensuring stability and accuracy in high-speed regimes. A key focus of the talk will be placed on identifying and addressing performance bottlenecks in the core computational kernels when implemented on GPUs. We will discuss various strategies and optimizations employed to enhance the performance and efficiency of the solver on GPU-accelerated platforms. The talk aims to provide insights into the practical aspects of developing performance portable DG solvers for advancing multi-physics flow simulations.

Complex Flows and Multiphase Dynamics: Insights From both Numerical Methods and Experiments

• Parisa Mirbod (University of Illinois at Chicago)

LCF Hosted Talk Abstract: Complex and multiphase flows, prevalent in both natural phenomena and industrial applications, span a wide array of disciplines, including microfluidics, biotechnology, energy storage, materials science, pharmaceuticals, additive manufacturing, and environmental sciences. This seminar provides a comprehensive exploration of numerical methods tailored to predict the behaviors and instabilities of multiphase and complex flows within canonical fluid mechanics geometries. Specifically, the seminar delves into the employing Volume-of-Fluid (VOF), Convective-Diffusive Interface (CDI), and Immersed Boundary Method (IBM) techniques. Moreover, it will highlight experimental analyses conducted on complex and multiphase flows across diverse structured surfaces. These analyses leverage cutting-edge experimental methods such as Magnetic Resonance Imaging (MRI), Particle Image Velocimetry (PIV), and Particle Tracking Velocimetry (PTV). Through the combined methodologies via both numerical simulations and experiments, attendees will gain valuable insights into the complexities of flow dynamics and instabilities, paving the way for the development of innovative strategies for precise flow control. These efforts hold promise to advance various sectors, ranging from healthcare to renewable energy, as outlined in the previously mentioned applications. By deepening our understanding of key physics behind these flows, engineers and researchers can devise more efficient systems, enhance product quality, and tackle critical challenges in their respective fields. The seminar will also provide glimpses into future modeling approaches and strategic plans, further enriching the discourse on complex flow phenomena and their diverse applications.

CELS Directorate-Wide Luncheon *FIRST COME, FIRST SERVE* In order to attend, you must complete the registration (found at the top of this page and on the home page!) Lunch will be catered by Chuck's Southern Comfort Cafe The menu includes: Pulled Pork Smoked Chicken Penne Pasta w/Marinara Coleslaw Roasted Veggies Mini Buns Spring Salad

BIO Project Overviews for Summer Students

• Dion Antonopoulos (BIO)

The Biosciences Division conducts research across a wide range of topics from understanding biological systems in the context of the natural environment to issues affecting human health. An overview of these projects will be given to provide context for summer student research activities.