Ricardo A. SCHUH FRANTZ

{ Ricardo A. SCHUH FRANTZ }

I'm a computational engineer based in Lausanne, Switzerland with 8+ years building high-performance numerical software at scale. Currently at EPFL building coupled flow-thermal solvers for conjugate heat transfer with PyTorch/JAX backends for gradient-based optimization. I port proven algorithms into modern, safe implementations (Rust, Modern Fortran) and build agentic engineering workflows—custom multi-agent orchestration, developer tooling, and AI-assisted scientific computing.

What I do

Simulate & optimize: coupled PDE solvers, stability analysis, gradient-based optimization with automatic differentiation
Port & harden: reimplement battle-tested algorithms (Minuit2, LIBSVM, Krylov solvers) in Rust with full differential test suites
Scale: MPI-parallel codes on 10,000+ cores, spectral/finite-element/finite-difference methods, HPC-ready pipelines
Agentic engineering: custom Claude Code skills/hooks/plugins, multi-agent orchestration, AI-assisted developer tooling

Selected projects

Fortran

nekStab — Stability analysis toolbox for Nek5000: linear/adjoint solvers, Newton-GMRES for UPOs, eigensolvers, native POD/SPOD/DMD

Fortran

LightKrylov — Standalone Krylov methods library: Arnoldi, Lanczos, GMRES, SVD. Published in JOSS.

Fortran

Xcompact3d — MPI-parallel Navier-Stokes solver for turbulence research

Fortran

dNami — Compressible flow framework with Python→Fortran codegen for compute-critical kernels

Python

dolfinx-rans — Standalone RANS k-ω solver in FEniCSx with conjugate heat transfer

Python

pyModal — Modal decomposition toolkit: POD, DMD, SPOD, ST-POD, bispectral analysis

Python

dsgbr — Spectral peak detector using dual Savitzky-Golay filtering for PSD signals. On PyPI.

Rust

nanobook — Trading engine: order book matching at ~120 ns/order, portfolio optimization, IBKR/Binance adapters. On crates.io.

Rust

nanochat-rs-next — Rust CLI for training tiny language models, benchmarked against karpathy/nanochat

Rust

minuit2-rs — CERN's Minuit2 rewritten in pure Rust, zero unsafe, Python bindings. Verified against ROOT. On crates.io.

Rust

libsvm-rs — LIBSVM rewritten in pure Rust. All SVM types/kernels, 250-config test suite, ~1e-8 parity. On crates.io.

Web

chaos-atlas — Interactive chaos explorer: bifurcation diagrams, Lyapunov exponents, strange attractors across 10 maps

Web

chaosviz — Browser-based chaotic attractor visualizer (Lorenz, Rössler, and more)

Web

coinscope — Crypto analysis dashboard with live CoinGecko data and technical indicators

Web

sacred-timeline — Chronological database from the Big Bang to present in a TVA terminal aesthetic

Plugin

fortran-lsp — Claude Code plugin for Fortran diagnostics, navigation, and refactoring via fortls

Publications

2026

LightKrylov: Lightweight implementation of Krylov subspace techniques in modern Fortran

2025

Asymptotic scaling laws for periodic turbulent boundary layers and their numerical simulation up to Re_θ = 8300

2025

Bifurcation sequence in the wakes of a sphere and a cube

2023

Krylov Methods for Large-Scale Dynamical Systems: Application in Fluid Dynamics

2022

PhD Thesis: Instabilités et transition à la turbulence dans les écoulements périodiques

2022

Horizontal meandering in direct numerical simulations of the stable boundary layer

2021

Xcompact3D: An open-source framework for solving turbulence problems on a Cartesian mesh

2021

High-fidelity simulations of gravity currents using a high-order finite-difference spectral vanishing viscosity approach

email: rasfrantz@gmail.com

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