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Koji Okamoto

University of Tokyo

SCHOLARLY PAPERS

17

DOWNLOADS

893

TOTAL CITATIONS

9

Scholarly Papers (17)

1.

Investigation and Development of Cutting-Edge Deep Learning Models for Prediction of Critical Heat Flux

Number of pages: 40 Posted: 01 Feb 2024
Wen Zhou, Shuichiro Miwa, HANYU WANG and Koji Okamoto
University of Tokyo, University of Tokyo, affiliation not provided to SSRN and University of Tokyo
Downloads 119 (600,462)

Abstract:

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Critical heat flux, Physics behaviors, deep learning, Transfer learning, neural network

2.

Bubble Feature Extraction in Subcooled Flow Boiling Using Ai-Based Object Detection and Tracking Techniques

Number of pages: 32 Posted: 07 Nov 2023
University of Tokyo, University of Tokyo, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and University of Tokyo
Downloads 88 (753,595)
Citation 3

Abstract:

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condensation bubble, subcooled flow boiling, feature extraction, object detection and tracking

3.

Fluid-Multi Rigid Body Simulation with Phase Change Based on Implicit-Moving Particle Hydrodynamics-Passively Moving Solid (Mph-Pms)

Number of pages: 48 Posted: 20 Feb 2025
University of Tokyo, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Tokyo, University of Tokyo and University of Tokyo
Downloads 77 (823,616)

Abstract:

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Computational Fluid Dynamics, Particle Method, Implicit Algorithm, Fluid Structure Interaction, Phase Change

4.

Bf-Gan: Development of an Ai-Driven Bubbly Flow Image Generation Model Using Generative Adversarial Networks

Number of pages: 47 Posted: 02 Dec 2024
Wen Zhou, Shuichiro Miwa, Yang Liu and Koji Okamoto
University of Tokyo, University of Tokyo, Virginia Tech and University of Tokyo
Downloads 74 (844,901)

Abstract:

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Bubbly Flow, Deep Learning, Image Generation Model, generative adversarial networks

Development of the Ai-Assisted Thermal Hydraulic Analysis Method for Condensing Bubbles in Vertical Subcooled Flow Boiling

Number of pages: 48 Posted: 06 Jan 2024
University of Tokyo, University of Tokyo, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and University of Tokyo
Downloads 54 (1,038,620)

Abstract:

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condensation bubble, subcooled flow boiling, artificial intelligence, thermal hydraulic analyses, object detection and tracking

Development of the Ai-Assisted Thermal Hydraulic Analysis Method for Condensing Bubbles in Vertical Subcooled Flow Boiling

Number of pages: 49 Posted: 12 Jun 2024
University of Tokyo, University of Tokyo, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and University of Tokyo
Downloads 19 (1,513,226)
Citation 2

Abstract:

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condensation bubble, subcooled flow boiling, Artificial Intelligence, thermal hydraulic analyses, object detection and tracking

6.

A Novel Fully Explicit Gpu-Accelerated Discrete Element Method Coupled with Moving Particle Hydrodynamics (Dem-Mph) for Simulating the Underwater Particle Sedimentation Behavior

Number of pages: 41 Posted: 24 Aug 2024
Ryo Yokoyama, Yihua Xu, Shuichiro Miwa and Koji Okamoto
University of Tokyo, affiliation not provided to SSRN, University of Tokyo and University of Tokyo
Downloads 58 (980,173)
Citation 1

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Computational Fluid Dynamics, Particle Method, Discrete Element Method, Parallel Computation, Debris bed, Core Disruptive Accident

A Quantitative Method of Eutectic Reaction Study between Boron Carbide and Stainless Steel

Number of pages: 23 Posted: 28 Apr 2022
affiliation not provided to SSRN, University of Tokyo, affiliation not provided to SSRN, affiliation not provided to SSRN, Shanghai Jiao Tong University (SJTU) - School of Nuclear Engineering, Japan Atomic Energy Agency and University of Tokyo
Downloads 29 (1,371,100)

Abstract:

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Core disruptive accident, Boron carbide, Stainless Steel, Eutectic reaction, Joule heating

A Quantitative Method of Eutectic Reaction Study between Boron Carbide and Stainless Steel

Number of pages: 23 Posted: 28 Apr 2022
affiliation not provided to SSRN, University of Tokyo, affiliation not provided to SSRN, affiliation not provided to SSRN, Shanghai Jiao Tong University (SJTU) - School of Nuclear Engineering, Japan Atomic Energy Agency and University of Tokyo
Downloads 28 (1,385,838)

Abstract:

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Core disruptive accident, Boron carbide, Stainless Steel, Eutectic reaction, Joule heating

8.

Transient Behaviour and Heat Transfer Characteristics in Debris Beds: Simulation and Analysis of the Livej2 Experiment

Number of pages: 26 Posted: 22 Dec 2023
affiliation not provided to SSRN, University of Tokyo, affiliation not provided to SSRN and University of Tokyo
Downloads 52 (1,041,696)

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severe accident, CFD, lower head, Fukushima Daiichi NuclearPower Station, Porous Media

9.

Introduction of a Dynamic Characteristics on the Boiling Crisis in Downward-Facing Flow Boiling: Chf Front Motion

Number of pages: 12 Posted: 28 Nov 2023
affiliation not provided to SSRN, affiliation not provided to SSRN, University of Tokyo, affiliation not provided to SSRN and University of Tokyo
Downloads 46 (1,109,210)
Citation 3

Abstract:

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critical heat flux, CHF front motion, Dry spots, Re-wetting, Boiling crisis

10.

Critical Heat Flux Prediction Using Interpretable AI: Accuracy and Engineering Insights

Number of pages: 57 Posted: 25 Sep 2025
affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Tokyo, University of Tokyo and University of Tokyo
Downloads 45 (1,121,190)

Abstract:

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Critical heat flux, Artificial Intelligence, Interpretability

11.

Determination of Spearman's Rank Correlation for Melt Spreading-Solidification Dynamics Through the Combination of Integrated Experiments and Monte Carlo Method

Number of pages: 32 Posted: 28 Nov 2024
University of Tokyo, University of Tokyo, University of Tokyo and University of Tokyo
Downloads 45 (1,121,190)

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Melt spreading, solidification, Heat transfer, Monte Carlo, Spearman's Ranking correlation

12.

Experimental Investigation on the Characteristics of Bubble Growth and Slide on a Downward-Facing Heater Surface in Flow Boiling

Number of pages: 18 Posted: 27 Jun 2022
affiliation not provided to SSRN, University of Tokyo, University of Tokyo, University of Tokyo and University of Tokyo
Downloads 36 (1,236,159)

Abstract:

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flow boiling, Bubble behavior, Bubble growth, Bubble slide

13.

Cfd Study of Surface Velocity Developed in a Single Bubble Rising in Still Water

Number of pages: 21 Posted: 10 Oct 2024
WEIYI YAO, Marco Pellegrini and Koji Okamoto
University of Tokyo, University of Tokyo and University of Tokyo
Downloads 35 (1,249,711)

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Pool scrubbing, Computational Fluid Dynamics, Volume Of Fluid, Bubble Rising, Internal Circulation

14.

Piv Investigation of Jet Mixing Induced by Direct Contact Condensation

Number of pages: 15 Posted: 29 Mar 2024
University of Tokyo, University of Tokyo, Culham Science Centre - United Kingdom Atomic Energy Authority and affiliation not provided to SSRN
Downloads 33 (1,277,121)

Abstract:

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Direct Contact Condensation, PIV, Chugging, Jet, Bubbling, Entrainment

15.

Experimental Study on 3D Large-Scale Debris Bed Formation Using Sub-Millimeter Particles for Core Catcher Design Optimization

Number of pages: 28 Posted: 16 Feb 2026
affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Tokyo, University of Tokyo and University of Tokyo
Downloads 23 (1,411,822)

Abstract:

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Severe accident, Debris Bed, Core Disruptive Accident, Sodium Fast Reactor, Core Catcher

16.

Experimental Investigation of Critical Heat Flux on Chromium-Coated Surfaces under Irradiation in Downward-Facing Flow Boiling

Number of pages: 22 Posted: 31 Jan 2026
affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Tokyo and University of Tokyo
Downloads 20 (1,448,301)

Abstract:

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Critical heat flux, Boiling process, Gamma-ray, EB-RISA

17.

Discretized Momentum Equation-Constrained Physics-Informed Graph Neural Networks for Meshfree Simulation of Highly Viscous Free-Surface Flows

Number of pages: 47 Posted: 26 May 2026
University of Tokyo, affiliation not provided to SSRN, University of Tokyo, University of Tokyo - The University of Tokyo and University of Tokyo
Downloads 12 (1,526,714)

Abstract:

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Particle method, Deep Learning, Graph Neural Networks, Physics Informed Neural Networks, Machine Learning, Computational Fluid Dynamics