CFP (Jul. 1, 2026): The 5th R2AFA (Deadline: Jun. 29, 2026)

[yo...@rist.or.jp]

SWoPP MLの皆様

高度情報科学技術研究機構 (RIST) の太田幸宏と申します。MLをお借りして、
オンラインセミナー第5回R-CCS/RIST共同セミナー:「富岳」とArm計算機
の先進的利用 (R2AFA) の案内 (2026/7/1開催) をさせていただきます。
重複して受け取られた場合はご容赦ください。

理化学研究所計算科学研究センター (RIKEN R-CCS）とRISTは、共同で
スーパーコンピュータ「富岳」およびArm計算機システムの利用に関する
セミナーを実施しています。講演題目、講演者については下記をご覧ください。

参加締め切りは2026/6/29です。皆様の参加をお待ちしています。

https://www.hpci-office.jp/events/seminars/seminar_r2afa_260701

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# The 5th R-CCS/RIST Joint Seminar on Advanced use of Supercomputer
Fugaku and Arm computer systems
[Date] 3:00 pm - 4:30 pm (JST), Wednesday, July 1st, 2026

[Registration (Until June 29th, 2026)]
https://www.hpci-office.jp/en/events/seminars/seminar_r2afa_260701

[Topics]
1. Development and Applications of Ab Initio Quantum Monte Carlo Methods
Using Fugaku
Speaker: Kosuke Nakano (NIMS and RIKEN)
Abstract:
Ab initio quantum Monte Carlo (QMC) methods are stochastic approaches
for solving the many-body Schrödinger equation, with the key advantage
of excellent parallel scalability inherent to Monte Carlo sampling. As
one of the beyond-density-functional-theory (DFT) methods, QMC
approaches allow accurate calculations of physical properties without
relying on approximate exchange-correlation functionals. We have been
developing ab initio QMC software packages for the K and Fugaku
supercomputer, and have applied them to challenging problems across
diverse fields, including computational chemistry (e.g., non-covalent
interactions), condensed matter physics (e.g. liquid and solid
high-pressure hydrogen), and planetary science (e.g., the interior
structures of Jupiter and Saturn). In this seminar, I will present an
overview of successful applications of ab initio QMC, together with
the ab initio QMC software packages we have developed and continue to
develop for the next Fugaku.


2. 100-Billion-Atom Molecular Dynamics Simulation of Acoustic Cavitation
on the Supercomputer Fugaku
Speaker: Yuta Asano (Faculty of Global Nursing, Iryo-Sosei University)
Abstract:
Acoustic cavitation, where ultrasound induces bubble nucleation, growth,
and collapse, involves complex multi-bubble dynamics that are difficult
to observe directly. To elucidate these microscopic mechanisms, we
performed a large-scale molecular dynamics simulation on the
supercomputer Fugaku, using 96% of the entire system. Modeling a massive
system of approximately 100 billion atoms, we successfully captured
bubble dynamics in which clusters periodically split and merge in sync
with the horn’s oscillation. During fragmentation, internal pressure
and temperature rise sharply, and long-timescale modulation indicates
subharmonic behavior consistent with experiments. Despite localized
cavitation activity, the impact on bulk acoustic properties is minimal.
These results provide molecular-level insight into cavitation and offer
guidance for optimizing ultrasonic systems in chemical and biomedical
applications.

[Remarks]
* Please use the chat feature to ask your questions during the seminar.
* The seminar will be recorded.
* The presentation materials and the recorded movie will be open to
public in the website:
https://www.hpci-office.jp/en/events/seminars#r2afa

[Contact]
E-mail: hpc-support-admin[-at-]hpci-office.jp
(Please replace [-at-] with @.)

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Research Organization for Information Science & Technology

Yukihiro Ota (Dr.)
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