Hari Kumar
Hello, I'm

Hari

I like creating mathematical models

Simulation engineer building HPC performance simulators, developing computational physics models, and creating web applications. I bridge the worlds of theoretical physics, high-performance computing, and full-stack development.

View Work Projects Read Blog

My Professional Experience

From theoretical plasma physics to production HPC systems

HPC Performance Simulator Development

JSOL Corporation · 2024 - Present

Designed and developed a performance simulation framework to analyze interactions between CAE software (50+ computational modules) and HPC systems. Built mathematical models to quantitatively evaluate execution performance, scalability, and bottlenecks.

C++ Qt Python HPC
Identified performance issues for major automotive client
Reduced AWS costs by millions of yen and saved months of debugging effort

Multi-Scale Plasma Simulation Research

Tohoku University · JSPS Fellow · 2022 - 2024

Developed novel numerical methods integrating molecular dynamics and plasma dynamics simulations to model laser-graphene interactions. Conducted large-scale HPC computations and validated results with experimental data.

C++ FORTRAN MPI Python
Published in Scientific Reports and other international journals
Supervised 3 undergraduate and 1 graduate student researchers

Featured Projects

Featured

Slotify

Web Service for Smart Scheduling

A full-stack web application I designed, developed, and launched to help users manage their time efficiently. Handles the complete product lifecycle from planning to deployment and user support.

~2,000 monthly active users
Continuous feature improvements based on user analytics
Full-Stack Product Design Business Management
Visit Site

HPC Performance Modeling

Mathematical models for predicting CAE software performance on various HPC architectures. Includes communication pattern analysis and scalability evaluation.

C++ Performance Analysis

Plasma-MD Coupling Framework

Integrated simulation framework combining molecular dynamics with plasma dynamics for multi-scale physics modeling on HPC clusters.

C++ / FORTRAN MPI Scientific Computing

Technical Expertise

Core Skills

Numerical Simulation Mathematical Modeling Algorithm Design Performance Analysis HPC & Parallel Computing Data Analysis & Visualization

Programming

C++ / FORTRAN90 Python (NumPy, SciPy, Pandas) MPI (Parallel Computing) Qt (GUI Development) HTML / CSS / JavaScript

Software & Tools

Ansys Fluent / Abaqus JMAG / HPC Systems MATLAB / Mathematica Windows / Linux / macOS Git / SVN / Version Control

Selected Publications

Research spanning plasma physics, high-energy density physics, and topological analysis

2024

Integrating sheath and radiation-based acceleration using scaling coefficients for tailoring radiation dominant hybrid acceleration

Kumar H S, Takahashi M, Kuramitsu Y, and Ohnishi N

Scientific Reports 14, 22531 (2024)

View Paper
2024

Characterization of stability of dynamic particle ensemble systems using topological data analysis

Kumar H S

Chaos 34, 013119 (2024)

View Paper
2024

A hybrid simulation integrating molecular dynamics and particle-in-cell methods for improved laser-target interaction

Kumar H S, Takahashi M, Kuramitsu Y, Kiriyama H, Fukuda Y, and Ohnishi N

High Energy Density Physics 53, 101148 (2024)

View Paper

8 journal papers · 5 conference presentations

View All Publications

Get In Touch

Interested in collaboration or want to discuss simulation engineering, HPC systems, or software development?

Email

Send Message

LinkedIn

Connect

GitHub

View Projects