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<h2 id="welcome">Welcome!</h2>
<p>We’re the <strong>Computational Physics Group at Georgia Tech</strong>. We build numerical methods, computational models, and <a href="/software/" target="_blank" rel="noopener noreferrer">open-source software</a> for problems in defense, energy, and medicine — optimized for the world’s largest supercomputers.</p>
<p><strong>Some of our research areas:</strong></p>
<ul>
<li>Exascale CFD and multiphase flow</li>
<li>Numerical methods for shock-laden and compressible flows</li>
<li>Reacting flows and combustion</li>
<li>Cavitation, microfluidics, and soft material characterization</li>
</ul>
<p><strong>Recent highlight:</strong> In August 2025 we conducted the <a href="https://arxiv.org/abs/2505.07392" target="_blank" rel="noopener noreferrer">largest-ever CFD simulation</a> (1 quadrillion DOFs) on OLCF Frontier and LLNL El Capitan — a 2025 <a href="https://en.wikipedia.org/wiki/Gordon_Bell_Prize" target="_blank" rel="noopener noreferrer">Gordon Bell Prize</a> finalist.</p>
<p>Check out <a href="/papers/">our papers</a> to learn more.</p>
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<h5>Spencer Bryngelson</h5>
<h6><i>Assistant Professor</i><br /> College of Computing, CSE<br /> College of Eng., AE/ME<br />Georgia Tech</h6>
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<h2>Thinking about joining the group?</h2>
<p>We’re always looking for new Ph.D. and undergraduate students who like building models, algorithms, and software.</p>
<ul>
<li>Strong coding + numerics background is a plus</li>
<li>Projects span exascale CFD, cavitation, microfluidics, and more</li>
</ul>
<p>👉 Visit the <a href="/vacancies.html">Vacancies</a> page for detailed instructions.<br />
<br />
<strong>What strong applicants usually have:</strong> Experience with C/C++/Fortran, numerical methods, and HPC. Familiarity with CFD, continuum mechanics, or scientific computing is helpful but not required.</p>
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<h2>Examples of our work</h2>
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<p><br />
<b>Exascale multiphase flow</b>: Scale-resolving simulation of a multi-rocket-booster configuration via <a href="https://mflowcode.github.io/" target="_blank" rel="noopener noreferrer">MFC</a> and information geometric regularization (IGR), developed with Florian Schäfer. Record-setting at <a href="https://arxiv.org/abs/2505.07392" target="_blank" rel="noopener noreferrer">1 quadrillion DOFs (200T grid points)</a> on <a href="https://www.olcf.ornl.gov/frontier/" target="_blank" rel="noopener noreferrer">OLCF Frontier</a> (viz. via Ph.D. student Ben Wilfong).</p>
<div style="background-color: #252829; padding: 20px; border-left: 4px solid #c0995e; margin: 22px 0;">
<p><strong>Interested in using MFC?</strong><br />
MFC is our flagship open-source solver for compressible multiphase flow at exascale.<br />
• GPU-optimized for AMD and NVIDIA<br />
• Validated on rocket, cavitation, and bubbly-flow problems<br />
• Actively maintained and used on OLCF Frontier and LLNL El Capitan<br />
<br />
👉 Visit the <a href="https://mflowcode.github.io/" target="_blank" rel="noopener noreferrer">MFC website</a> or the <a href="https://github.com/MFlowCode/MFC" target="_blank" rel="noopener noreferrer">GitHub repo</a> to get started.</p>
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<p><a href="https://github.com/MFlowCode/MFC/stargazers" target="_blank" rel="noopener noreferrer"><img src="https://img.shields.io/github/stars/MFlowCode/MFC?style=social" alt="GitHub stars" /></a>
<a href="https://github.com/MFlowCode/MFC/releases/latest" target="_blank" rel="noopener noreferrer"><img src="https://img.shields.io/github/v/release/MFlowCode/MFC" alt="Latest release" /></a></p>
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<p>Many of the techniques used in our record-setting rocket simulations are available in MFC, so external users can reproduce similar workflows on their own clusters.</p>
<div style="padding:2px;background:#000;border-radius:8px;width:60%;height:100%;margin:0 auto;overflow:hidden; text-align: center; justify-content: center">
<iframe src="https://player.vimeo.com/video/987402712?autoplay=1&loop=1&autopause=0&muted=1&quality=720p&background=1" frameborder="0" width="100%" height="250" allow="autoplay" title="Blood cell simulation video"></iframe>
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<p><br />
<b>Cell-scale flow in microfluidics</b>: High-fidelity spectral boundary integral simulation of blood cells transitioning to chaos. We developed stochastic models enabling microfluidic device design and improved treatment outcomes. Above: a microaneurysm (viz. via student Suzan Manasreh).</p>
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<h2>News</h2>
<p>
<strong style="color: #c0995e;">March 22, 2026</strong>
<br />
Our <a href="https://doi.org/10.1016/j.ijmultiphaseflow.2026.105674" target="_blank" rel="noopener noreferrer">paper</a> on hardware-accelerated phase-averaging for cavitating bubbly flows, a collaboration with <a href="https://wp.wpi.edu/cmtl/" target="_blank" rel="noopener noreferrer">Aswin Gnanaskandan</a> and Diego Vaca-Revelo of WPI, is published in the <i>International Journal of Multiphase Flow</i>.
</p>
<p>
<strong style="color: #c0995e;">March 16, 2026</strong>
<br />
We are at the <a href="https://march.aps.org/" target="_blank" rel="noopener noreferrer">APS March Meeting</a> in Denver this week. Spencer is presenting on <a href="https://summit.aps.org/events/MAR-M43/2" target="_blank" rel="noopener noreferrer"><i>Shocks without tracking or capturing</i></a> at exascale, and Zhixin Song is presenting on <a href="https://summit.aps.org/events/MAR-A18/11" target="_blank" rel="noopener noreferrer"><i>Efficient Reconstruction for Real-Valued Quantum States</i></a>.
</p>
<p>
<strong style="color: #c0995e;">March 12, 2026</strong>
<br />
Spencer is giving a seminar at the <a href="https://www.utsi.edu/" target="_blank" rel="noopener noreferrer">University of Tennessee Space Institute</a> on the simulation of many-engine rocket boosters.
</p>
<p>
<strong style="color: #c0995e;">March 11, 2026</strong>
<br />
Spencer is giving a seminar at <a href="https://www.ornl.gov/" target="_blank" rel="noopener noreferrer">Oak Ridge National Laboratory</a> on benchmarking scientific workloads and the scientific use of exascale machines in practice.
</p>
<p>
<strong style="color: #c0995e;">March 4, 2026</strong>
<br />
Spencer is presenting <i>Compressible Flow with a Free Lunch: Simulating 1 Quadrillion Degrees of Freedom Via Regularization Without Loss of Accuracy</i> at <a href="https://www.siam.org/conferences-events/siam-conferences/pp26/" target="_blank" rel="noopener noreferrer">SIAM PP26</a> this week in Berlin, Germany.
</p>
<p>
<strong style="color: #c0995e;">February 20, 2026</strong>
<br />
The group receives a <a href="https://doeleadershipcomputing.org/" target="_blank" rel="noopener noreferrer">DOE INCITE</a> award of 750K node hours on <a href="https://www.olcf.ornl.gov/frontier/" target="_blank" rel="noopener noreferrer">OLCF Frontier</a> for the project <i>Exascale-enabled Simulation of Cavitation for Medicine and Beyond</i>. PI Bryngelson, co-PIs T. Colonius, M. Rodriguez, F. Liu, and R. Budiardja.
</p>
<p>
<strong style="color: #c0995e;">February 19, 2026</strong>
<br />
Spencer is giving a talk at the <a href="https://www.aerosociety.com/events-calendar/raes-aerodynamics-workshop-2026-cfd-validation-challenges-perspectives-from-modellers-and-measurers/" target="_blank" rel="noopener noreferrer">RAeS Aerodynamics Workshop 2026</a> in London on soft material characterization at high strain rates and surrogate models for turbulence. Collaboration with UT Austin, Michigan, and Brown.
</p>
<p>
<strong style="color: #c0995e;">January 18, 2026</strong>
<br />
Our paper on MFC 5.0 (<a href="https://arxiv.org/pdf/2503.07953" target="_blank">preprint here</a>) was accepted for publication in <i>Computer Physics Communications</i>. Thanks to all the authors, collaborators, and referees!
</p>
<p>
<strong style="color: #c0995e;">January 8, 2026</strong>
<br />
Our AIAA SCITECH ‘26 conference paper, focusing on <a href="https://doi.org/10.2514/6.2026-1812" target="_blank">symbolic computational abstraction of chemistry libraries</a> is now available online. Work with Ph.D. student Dimitrios Adam and UTSI faculty Esteban Cisneros-Garibay. We will be presenting it during the <a href="https://arc.aiaa.org/doi/book/10.2514/MSCITECH26" target="_blank">SCITECH forum</a> next week, Jan 12-16, 2026.
</p>
<p>
<strong style="color: #c0995e;">December 22, 2025</strong>
<br />
A new group preprint by graduate student Haocheng Yu and postdoc Tianyi Chu, <i>Energy dissipation mechanisms in an acoustically-driven slit</i>, is <a href="https://doi.org/10.48550/arXiv.2512.19507" target="_blank" rel="noopener noreferrer">available on arXiv</a>. Using DNS and spectral POD, we quantify how incident acoustic energy is converted into vortical motion and viscous dissipation, identifying the coherent structures and mechanisms that govern absorption.
</p>
<h5><a href="/allnews.html">… see all News</a></h5>
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<h5>About</h5>
<p><a href="https://cse.gatech.edu/" target="_blank" rel="noopener noreferrer">School of CSE</a><br/> <a href="https://cc.gatech.edu/" target="_blank" rel="noopener noreferrer">College of Computing</a><br/> Georgia Tech
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<h5>Information</h5>
<p><a href="mailto:shb@gatech.edu" target="_blank" rel="noopener noreferrer"><i class="fa fa-envelope fa-1x"></i> Email Spencer</a> <br/> <a href="/vacancies.html"><i class="fa fa-users fa-1x"></i> Explore openings</a> <br/> <a href="https://github.com/sbryngelson/academic-website-template" target="_blank" rel="noopener noreferrer"><i class="fab fa-github fa-1x"></i> Site template</a>
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<center><p>Last updated on Mar 22, 2026</br>
© 2021-2026 Computational Physics @ GT </p></center>
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mfc50: `@article{wilfong26,
title={MFC 5.0: An exascale many-physics flow solver},
author={Wilfong, Benjamin and {Le Berre}, Henry and Radhakrishnan, Anand and Gupta, Ansh and Vickers, Daniel J. and Vaca-Revelo, Diego and Adam, Dimitrios and Yu, Haocheng and Lee, Hyeoksu and Chreim, Jose Rodolfo and {Carcana Barbosa}, Mirelys and Zhang, Yanjun and Cisneros-Garibay, Esteban and Gnanaskandan, Aswin and {Rodriguez Jr.}, Mauro and Budiardja, Reuben D. and Abbott, Stephen and Colonius, Tim and Bryngelson, Spencer H.},
journal={Computer Physics Communications},
volume={322},
pages={110055},
year={2026},
doi={10.1016/j.cpc.2026.110055}
}`,
mfc30: `@article{bryngelson2021mfc,
title={MFC: An open-source high-order multi-component, multi-phase, and multi-scale compressible flow solver},
author={Bryngelson, Spencer H. and Schmidmayer, Kevin and Coralic, Vedran and Meng, Jianchun and Maeda, Kazuki and Colonius, Tim},
journal={Computer Physics Communications},
volume={266},
pages={108029},
year={2021},
doi={10.1016/j.cpc.2021.108029}
}`
};
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