Research on ice accretion prediction

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EDA201N14

Subject Category: Aeronautical Technology

Responsible Representative: Kazuyuki Nakakita, Aviation Technology Directorate, Fundamental Aeronautics Research Unit
Contact Information: Hiroki Tsujimura(tsujimura.hiroki@jaxa.jp)
Members: Yuki Ide, Koetsu Ito, Kei Shimura, Hiroki Tsujimura

Abstract

Ice accretion is a threat to aircraft flight safety, so the evaluation of its influence is a critical factor in design and certification. This study focuses on numerical prediction of ice accretion that aims to accelerate aircraft development process.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

We use JSS3 because ice prediction is an iterative process of solving airflow and droplet trajectory around an airfoil with ice accretion, solving liquid film flow on an ice surface, and grid regeneration according to the new ice shape, with the ice being in a complex shape, which requires substantial computational resources.

Achievements of the Year

We improved mesh deformation techniques for multi-shot analysis and evaluated their effectiveness by conducting icing analysis of a CRM65 wing model. The analysis proceeded to a duration time that is equivalent to that of an icing wind tunnel test, and a three-dimensional ice prediction result was successfully obtained. Also, to assess the applicability of our tool to rotating wings, we conducted two-dimensional quasi-steady icing analyses of a rotor blade model and identified technical challenges that should be addressed in future work.

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: OpenMP
Number of Processes: 36 - 96
Elapsed Time per Case: 24 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.11

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name	CPU Resources Used (Core x Hours)	Fraction of Usage*2(%)
TOKI-SORA	2803907.61	0.13
TOKI-ST	28351.59	0.03
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	1944.82	0.15
TOKI-TST	0.00	0.00
TOKI-TGP	0.00	0.00
TOKI-TLM	0.00	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	0.00	0.00
/data and /data2	10240.00	0.07
/ssd	0.00	0.00

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	0.00	0.00

*1: Fraction of Usage in Total Resources: Weighted average of three resource types (Computing, File System, and Archiver).

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.

ISV Software Licenses Used

ISV Software Licenses Resources
	ISV Software Licenses Used (Hours)	Fraction of Usage*2(%)
ISV Software Licenses (Total)	519.67	0.36

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.