30 July, 2025

Our work on parsimonious IMR (pIMR) has now appeared in Soft Matter! It describes and demonstrates a scheme for high-fidelity material inference that reduces the cost of experimentation or simulation by two orders of magnitude. With this, we enable material characterization in tractable time. In collaboration with Michigan, Brown, and UT Austin.

29 July, 2025

Florian Schäfer and I are presenting our collaborative work on computational fluid dynamics via IGR in back-to-back talks at the joint SIAM/CAIMS Annual Meeting tomorrow in Montreal, Wed July 30. Link Here.

24 July, 2025

Our group, in collaboration with Florian Schäfer, was featured in Oak Ridge News for our record-setting compressible shock-laden CFD simulations. They exceeded 100 trillion grid points while maintaining speed and accuracy via mixed-precision, unified memory addressing on the CPU-GPU interconnect, and information geometric regulariation. These simulations targeted multi-rocket-engine outflow at Mach 15. These conditions and the geometry are similar to the SpaceX Starship superheavy 33-rocket booster.

21 July, 2025

Spencer is in Chicago at the 18th U.S. National Congress on Computational Mechanics (USNCCM) giving a talk in the special session on compressible multiphase flows. He’s talking about Numerics for diverse exascale platforms for multi-species flow, joint work group Ph.D. students Ben Wilfong and Anand Radhakrishnan in collaboration with Prof. Florian Schäfer and Stephen Abbott.

11 July, 2025

GT wrote a news piece on our group’s effort and collaboration to help launch JSC JUPITER via its early access program. We helped benchmark the system in preparation for user access. JUPITER is now Europe’s top supercomputer, in fourth place after the US’s CORAL-II systems (El Cap. and friends).

8 July, 2025

The group receives a DOE ALCC allocation of about 500K node hours (2M GPU hours) on OLCF Frontier for the next year. This is part of a collaboration with Ryan McMullen at Sandia National Labs. The project is called Multiphase Mixing Induced by Interface Breakup.

7 July, 2025

We welcome Dan Vickers to the group! He joins us from his previous appointment at MIT Lincoln Lab.

29 June, 2025

Our paper on quantum-resource frugal algorithms for solving CFD problems was published by Future Generation Computing Systems. Congrats to group undergraduates Melody Lee and Sriharsha Kocherla and Ph.D. student Jack Song and thank you to collaborators Austin Adams and Alex Alexeev!

5 June, 2025

Spencer gives a talk at the workshop on Algorithms For Multiphysics Models In The Post-Moore’s Law Era on extreme scale compressible flow simulation via information geometric regularization.

29 May, 2025

Our group, including postdoc Tianyi Chu and Ph.D. student Ben Wilfong, collaborate with Sandia National Lab to uncover a new hydrodynamic instability that occurs when Rayleigh-Taylor and Faraday behaviors meaningfully co-exist. The preprint is linked above. Theory and simulations demonstrate our result.

22 May, 2025

Spencer gave an invited conference talk at the joint Meeting of the Acoustical Society of America and International Congress on Acoustics. He talked about the computation of high-amplitude acoustics with application of therapeutic ultrasound and implication of noise.

20 May, 2025

Tianyi Chu’s research on optimal experimental design for soft material cauterization is now on arXiv. We show that if one uses radial basis functions as local interpolants as an intermediate step in the BOED process, the model selection process is accelerated by about two orders of magnitude.

13 May, 2025

Our work on Hadamard-tree tomography via Hadamard Random Forests (HST) appears on arXiv. We show that, assuming real valued output states, one can reconstruct their values in linear time (in qubit count) as opposed to the exponential time of full state tomography. Thanks to our collaborators Bryan Gard (GTRI) and Nico Renaud (Netherlands eScience Center).

13 May, 2025

Collaborative work using information geometric regularization and carefully tuned numerics exceeds 100 trillion grid-points for a rocket-exhaust simulation is now on arXiv. This is the largest CFD simulation conducted to-date, to the authors’ knowledge, in this case by a factor of about 10. Florian and Spencer thank collaborators at NVIDIA, AMD, ORNL, and HPE, as well as the dedicated Ph.D. students.

12 May, 2025

Spencer is in Toulouse, France at the International Conference on Multiphase Flow presenting work on multiphase flow models without discontinuity capturing, joint with Florian Schäfer and Ph.D. student Anand Radhakrishnan.

1 April, 2025

Our work on symbolic expressions and transversal for accelerated and differentiable reacting flow simulation is on arXiv! The method is implemented in an open source package called Pyrometheus and has been linked into MFC.

17 March 2025

We are at the APS March Meeting talking about exascale compressible flow simulation on El Capitan and GPU-based compact finite difference algorithms!

11 March, 2025

MFC 5.0 appears in code and as a preprint manuscript on arXiv! MFC 5.0 is a many-physics multiphase compressible flow solver that scales ideally on exascale machines, including LLNL El Capitan and OLCF Frontier. Read more about the latest features at the manuscript link.

5 March, 2025

We are at SIAM CSE in Fort Worth, Texas this week! Postdoc Tianyi Chu is presenting his work on Bayesian optimal design for discovery of soft material properties.

11 February, 2025

An article on the work of our group and our collaborators on new exascale computers, including OLCF Frontier (mostly) and now LLNL El Capitan, has been published by the Oak Ridge Leadership Computing Facility.

11 February, 2025

Today Spencer gives a Seminar at the Institute of Computational Engineering at the University of Florida! Thanks to Bala for the invitation!

10 February, 2025

Dr. Tianyi Chu’s paper on optimal discovery of soft material properties via targeted deformations, in collaboration with Jon Estrada of Michigan, was published in Computation Mechanics!

28 January, 2025

Spencer is at PNNL, a DOE lab., this week. He is giving a seminar on solving PDEs with quantum devices. Thank you Xianyu Li and Johannes Muelmenstaedt for the kind invitation!

27 January, 2025

In exascale supercomputing news, our group was granted a DAT (dedicated access time) for 100% of LLNL El Capitan (40K+ GPUs) for one day. This time was used to measure the performance of MFC, our flagship open source solver, and evaluate the readiness of the El Capitan system before it moves to the classified network. Further, our OLCF Frontier allocation was renewed into FY25. Our work with the JSC JUPITER team continues, who manage Europe’s first exascale supercomputer and early access systems.

8 January, 2025

The pIMR manuscript appears on arXiv! We devise a parsimonious scheme for high-fidelity material inference that cuts the cost of experimentation or simulation by two orders of magnitude. With this, we enable material characterization in tractable time. In collaboration with Michigan, Brown, and UT Austin.

28 November, 2024

Our paper on quantum solves of the Navier-Stokes equations using current quantum devices was accepted to Computers & Fluids! Congrats to Ph.D. student Jack Song and our collaborators at GTRI! You can view it here.

24 November, 2024

Our group is at APS DFD this week. Say hi and consider checking out some of our talks on multiphase flow, FSI, particle-laden flow, material characterization, and more! (most easily found via here and searching Bryngelson.)

16 November, 2024

Spencer is speaking at ART@SC24 today on HPC for PDE solves and large-scale training.

14 November, 2024

Our project ExaMFlow, based on MFC, is participating in JUREAP, the JUPITER Research and Early Access Program. ExaMFlow received the JUREAP certificate for scaling efficiency and node performance, with potential to use a significant part of the JUPITER Booster system and the first European exascale supercomputer, starting January 2025.

13 November, 2024

We will be at SC24 here in Atlanta next week. Our work includes cell-resolved simulations of aneurysms and exascale compressible flow methods. More here and here.

10 October, 2024

The group is awarded ACCESS-CI Accelerate annual allocation of 3M credits (equivalent to 45K A100 GPU hours) for developing sub-grid physics models!

20 September, 2024

Our work on a fully quantum lattice algorithm for solving the Navier-Stokes equations was recently published in AVS Quantum Science. Congrats to Sriharsha and Jack! We appreciate the collaboration with Bryan Gard (GTRI), Eugene Dumitrescu (ORNL), and Alex Alexeev (GT ME).

19 September, 2024

New paper on the use of the adjoint to compute averaged closure operators in turbulent flow was published in Physical Review Fluids! In collaboration with Jessie Liu and Ali Mani (Stanford), Florian Schäfer (GT), and Tamer Zaki (Hopkins).

18 September, 2024

Our Supercomputing (SC) paper from the WACCPD workshop was accepted. It is now on arXiv. We show how to achieve performant compute kernels on AMD GPU devices via OpenACC offloading, and use them to scale to all of OLCF Frontier. Congrats to Ben, Anand, and Henry! and thanks to our collaborators, Steve Abbot at HPE/Cray and Reuben Budiardja at Oak Ridge!

17 September, 2024

Our preprint, Rational-WENO, appears on arXiv. We construct a scheme that achieves near 5th order accuracy from a three-point stencil. In collaboration with Google Research and TU Munich.

13 September, 2024

The group is awarded an ACCESS-CI Maximize allocation, the largest offered by the NSF. It amounts to 225K GPU hours and focuses on algorithms for direct simulation of compressible and multiphase flow.

4 September, 2024

Tianyi’s manuscript on inferring rheological properties via Bayesian optimal design and bubble dynamics is now on arXiv!

1 September, 2024

We start a collaborative effort with the Bhamla Lab on bio-inspired propulsion! Acknowledgement to DARPA for the funding.

31 August, 2024

Ph.D. student Ben Wilfong is a recipient of the 2024-25 CRNCH Fellowship for application optimization on superchip architectures. Congrats!

28 August, 2024

Our work with Sandia National Labs received a funding renewal. We are working on two-phase hydrodynamic instability and direct simulation.

26 August, 2024

Presenting our work on sub-grid cavitation models and their computation on exascale machines at ICTAM2024 in Korea this week!

21 August, 2024

We achieve the first performance result of MFC on the AMD MI300A superchip that will populate LLNL El Capitan. We see a 2-times speedup over the AMD MI250X in OLCF Frontier.

16 August, 2024

Dimiti Adam joins the group as a Ph.D. student. Welcome!

29 July, 2024

We will be at AIAA Aviation this week! On Thursday, Ben and Haocheng are presenting their papers on two-phase interfacial instabilities and sound generation through mildly misfit earplugs.

10 July, 2024

Spencer gives a seminar at the US Naval Research Lab on exascale simulation of multiphase, shock-laden, and reacting flows.

1 July, 2024

MFC accepted into JUREAP Phase 1, the JUIPTER Exascale Early Access Program at JSC.

26 June, 2024

Presenting our work on exascale multiphase flow simulation at ICNMMF5 in Reykjavik, Iceland!

4 June, 2024

Jack’s manuscript on solving the Navier-Stokes equations on actual (IBM) quantum devices is now on arXiv!

3 June, 2024

Presenting our work on stochastic modeling of cavitation inception at CAV2024 in Crete, Greece; say hello if you catch me!

21 May, 2024

Work starts on our new contract with LLNL on regularization of kinetic-based PDEs. Looking forward to the collaboration!

12 May, 2024

Our paper, Method for portable, scalable, and performant GPU-accelerated simulation of multiphase compressible flow, was accepted to Computer Physics Communications. Congrats to Anand, Henry, and Ben!

9 May, 2024

Congratulations to Jesus and Ben, who passed their Ph.D. qualifying exams!

6 May, 2024

Subrahmanyam, resident sickle cell dynamics expert, graduates with his BSCS and heads to a snazzy industry gig. Congratulations, Sub!

4 May, 2024

Max starts his NVIDIA summer internship. Congrats, Max!

8 April, 2024

Congraulations to Suzan on winning the PURA Salary Award for research this summer, and Anshuman on our latest publication: Neural networks can be FLOP-efficient integrators of 1D oscillatory integrands.

4 March, 2024

We are at the 2024 APS March Meeting! We have talks on simulating fluid flow on quantum devices as well as exascale machines like Frontier.

23 February, 2024

Dr. Tianyi Chu joins the group as a postdoc. Welcome, Tianyi!

19 February, 2024

Spencer gains coutesy appointment in Georgia Tech’s Woodruff School of Mechanical Engineering.

13 February, 2024

MFC has been accepted to the second round of the Oak Ridge Frontier Hackathon! MFC scales to 100% of the world’s largest computer, but extracting maximum performance still needs attention. We look forward to working on it!

9 February, 2024

Spencer gives an invited talk at the 2024 CRNCH Summit on CFD on an existing IBM quantum device. Great event!

1 February, 2024

Spencer gave a (virtual) talk for NSWC Carderock on solving flow problems with current quantum devices. Thanks for the invitation!

28 January, 2024

ONR funded a 3-year grant to our group, collaborative with Prof. Suresh Menon (AE) on solid fuel propellants and CFD. Looking forward to it!

26 January, 2024

ONR funded a MURI on solid fuel ramjets and high-enthalpy flows to Georgia Tech with co-PIs Suresh and Spencer, among others. PI Greg Young (VT). Looking forward to the collaboration!

23 January, 2024

Sriharsha’s work on quantum algorithms is now posted on arXiv. He develops algorithm improvements and exposed parallelization for fluid flow problems on quantum devices with reduced gate counts.

19 January, 2024

The group welcomes Lian Xiang, who joins as an undergraduate researcher from Physics! She is working on near-term quantum algorithms for fluid flow problems.

22 December, 2023

Our paper on Fast Macroscopic Forcing was published in the Journal of Computational Physics. Joint work with Florian Schäfer, Jessie Liu, and Ali Mani.

14 December, 2023

Our paper on RoseNNa was published by Computer Physics Communications. Congrats, Ajay!

7 December, 2023

Spencer gives a virtual talk for Google Research, Applied Science. Thanks for the invite, Qing Wang!

5 December, 2023

Congratulations to group undergraduate researcher Subramanyam on winning a PURA Salary Award for Spring semester research!

19 November, 2023

Anand, Jesus, Spencer, and Sriharsha are at APS DFD in Washington, DC. Our talks are here. Say hi if you see us!

6 November, 2023

Spencer gave a talk on stochastic sub-grid models at the Workshop on Compressible Multiphase Flows hosted by Stanford University. Thanks to the organizers, Ali and David, for the invite!

16 October, 2023

Manuscript on non-local closure operator recovery submitted and on the arXiv. Joint work with Jessie Liu and Ali Mani (Stanford), Tamer Zaki (Johns Hopkins), and Florian Schäfer(GT).

3 October, 2023

The group was accepted to the Frontier Hackathon as we prepare to run MFC at exascale on OLCF Frontier.

25 September, 2023

Spencer, Florian, and Stanford colleague Ali Mani organized a minisymposium at the latest IACM MMLDE conference in El Paso, Texas. Collaborator Jessie Liu (Stanford) presented our ongoing work on a targeted nonlocal closure recovery scheme via adjoint macroscopic forcing.

17 September, 2023

Jack and Spencer are at IEEE International Conference on Quantum Computing and Engineering! Jack is giving a tutorial on solving PDEs using quantum computers (material is open source, here).

14 September, 2023

Spencer is giving a seminar at the University of Illinois at Urbana-Champaign on Friday September 14, do join us or say hi if you are around!

6 September, 2023

Spencer gave a seminar for the Georgia Tech Woodruff School of Mechanical Engineering.

31 July, 2023

Ajay’s neural net. inference library, roseNNa, is now also described in this manuscript!

6 July, 2023

Congraulations to group Ph.D. student Haocheng Yu, who passed his qualifying exam today!

5 July, 2023

Congratulations to the VIP Student Cluster Competition team for being accepted to the IndySCC competition!

25 June, 2023

Our preprint on the fast macroscopic forcing method is on arXiv! A collaborative effort with Florian Schäfer (Gatech) and Jessie Liu and Ali Mani (Stanford).

17 June, 2023

Congratulations to research scientist Dr. Bryan Gard on winning GTRI IRAD of the Year award! For work with the group on quantum algorithms for PDEs and CFD.

13 June, 2023

Paper on electrodynamic drops published in JCP.

06 June, 2023

Spencer gave the OpenACC Webinar today. Will update this post with the recording.

16 May, 2023

We posted our preprint on a strategy for performant simulation of multiphase flows approaching exascale on arXiv!

15 May, 2023

Our preprint on a lattice-based quantum algorithm for fluid flows is now on arXiv! Fun continued collaboration with ORNL and GTRI.

3 May, 2023

Congratulations to Fatima Ezahra Chrit on a successful Ph.D. defense!

21 April, 2023

NVIDIA H100s finally arrive in the lab!

13 April, 2023

Congratulations to Qi Zeng for winnning the 2023 Outstanding Undergraduate Researcher Award from the College of Computing and Ansh Gupta for winning a PURA Salary award for this summer!

9 April, 2023

Spencer and Anand travel to Kobe, Japan to present their papers at ICMF23.

13 March, 2023

Anand and Henry’s work on near-exascale compressible CFD was presented at the APS March Meeting in a focus session.

26 January, 2023

The 2023 CRNCH Summit is Feb 2-3! Many members of the CPG are presenting posters and many great external scientists giving talks! SHB moderating the SciML panel. (update: photo here)

24 January, 2023

Spencer is giving a talk on competitive optimization methods at the next Lawrence Livermore DDPS Webinar. (Update: video here)

22 January, 2023

Qi Zeng and Yash Kothari’s CPINNs work accepted to ICLR 2023! Joint with Florian Schäfer.

11 January, 2023

The Georgia Tech Open Hackathon official started! SHB organizing with NVIDIA. (story here)

11 January, 2023

Paper on sub-grid moment methods for fully-coupled cavitating flows published in JCP.

02 January, 2023

Group awarded subcontract from Sandia National Lab on bubbly flows. We look forward to the collaboration!

28 December, 2022

Paper on numerics for the 7-equation model with Prof. Menon and Achyut Panchal of GT AE accepted to JCP!

22 November, 2022

CPG attended APS DFD! Were on 10 abstracts in one way or another. Spencer had fun chairing the quantum computing session (standing room only!), where Fatima gave an excellent talk.

18 November, 2022

Ajay Bati pushes the first public release of roseNNa, a fast, portable, and minimally-intrusive neural network inference library for use with Fortran and C.

15 November, 2022

We are at SC22 where Anand and Henry are presenting their work! Here’s a photo of us.

13 October, 2022

We posted our preprint on a spectral method for electrodynamic flows in drops on the arXiv! Awesome outcome from a collaboration with Hossein and Prof. David Saintillan at UCSD (who has the coolest website subdomain).

12 October, 2022

SHB gave talks at GT Aero and GT Applied and Computational Math. Thanks to Professors Cristina Riso and Wenjing Liao for the invitations!

20 September, 2022

Preprint on application performance on ARM+GPU supercomputers submitted and posted on the arXiv! Anand and Henry contributed the MFC portion.

24 August, 2022

NVIDIA awards the group four BlueField2 DPUs!

18 August, 2022

Congrats to Ph.D. student Jack Song on winning a CRNCH fellowship to work on quantum computing for PDEs!

14 August, 2022

Spencer and Florian Schäfer return from the Stanford CTR Summer Program. Very productive time, thanks to Ali Mani and Jessie Liu for hosting us!

8 August, 2022

Ben Wilfong joins the group as a PhD student! He’s working on multiphase computational fluid dynamics.

5 August, 2022

Spencer named a Class of 1969 Teaching Fellow and a Georgia Tech Faculty Writing Scholar.

22 June, 2022

AMD donates an MI200-series GPU server to the group!

9 June, 2022

Ph.D. student Fatima Chrit and incoming freshman Sriharsha Kocherla have their first conference abstract on quantum algorithms for fluid flows accepted to TQC 2022!

28 May, 2022

Spencer wins Powe Junior Faculty Enhancement Award from Oak Ridge National Lab.

14 May, 2022

Group wins GT Seed Grant for quantum simulation!

4 May, 2022

Ph.D. students Fatima Chrit and Austin Adams presented their work on quantum algorithms and compiler backends at the GT Quantum Alliance Workshop!

25 Apr, 2022

Congratulations to Qi Zeng on his first conference paper, which was accepted to an ICLR workshop! It’s arXived here.

15 Apr, 2022

Spencer gives talks at Emory and Arizona State Universities. Thanks to Professors Veneziani and Xi (Emory) and Kim (ASU) for hosting!

13 Apr, 2022

Undergraduates Ajay Bati and Qi Zeng gave great talks at the Annual GT Undergraduate Research Symposium, well done!

26 Mar, 2022

Spencer visits Brown, MIT, and Harvard. Thanks to Professors Rodriguez, Sapsis, and Koumoutsakos for hosting!

1 Mar, 2022

Ajay Bati joins our group. He’s working on deploying neural network models in HPC settings!

21 Feb, 2022

GSCS22 was this past Saturday! It was sponsored by COC CSE.

4 Feb, 2022

The 2022 CRNCH Summit finished today! Spencer gave an invited talk on quantum computing for CFD, video here.

27 Jan, 2022

The inaugaural GT HPC Hackathon wrapped up today! Thank you to the mentors, participants, and sponsors NVIDIA and Oak Ridge National Lab.

29 Dec, 2021

Preprint on moment-based closures for cavitating flows is now on arXiv.

9 Dec, 2021

GTRI Scientist Bryan Gard awarded IRAD to work with our group for 2022 on quantum algorithms!

10 Nov, 2021

Henry Le Berre (CS) joins the group!

3 Nov, 2021

Fatima Chrit (advised by A. Alexeev in ME) and Jesus Arias (advised with L. Sankar in AE) are working with our group! Their research is funded in part by GTQA and GTRI.

4 Oct, 2021

Joint work with MIT SAND group on stable high-order QBMMs is now on arXiv!

14 Sept, 2021

Spencer gave an invited talk on GPU acceleration of multiphase CFD at OpenACC summit! Watch it here.

1 Sept, 2021

Girish Ganesan (GPU computing) and Sriharsha Kocherla (quantum algorithms) joined the group!

15 August, 2021

Anand Radhakrishnan (multiphase flow models) and Scott Sims (multiscale time-steppers) joined the group!

20 April, 2021

Jean’s data assimilation paper was accepted to JMPS, see it here!

5 November, 2020

Paper on QBMMlib was published by SoftwareX. It’s open access, check it out!

13 August, 2020

Preprint released on QBMMlib, our open-source solver for quadrature moment methods!

11 August, 2020

Preprint submitted on data assimilation for rheometric data!

22 May, 2020

Paper on near-crevice bubble collapse with N. Adam’s TU Munich group accepted to JFM!

2 May, 2020

MFC paper accepted to Computer Physics Communications!