xFlo

eXperimental Flow
Adrien Crovato, 2025.

Main features

xFlo is a Python code solving the compressible Euler equations around airfoils. The code is a playground dedicated to learning computational fluid dynamics and programming techniques.

xFlo currently implements the following techniques:

• perfect gas constitutive law and Euler conservation equations;
• slip-wall and farfield (Riemann invariants) boundary conditions;
• Lax-Friedrichs, JST, Roe, HLL and HLLC convective schemes;
• explicit Runge-Kutta, explicit and implicit Euler time integration methods;
• Green-Gauss gradients reconstruction method with Venkatakrishnan limiter.

Documentation

Get, install and test the code:

git https://github.com/acrovato/xflo.git
cd xflo
python3 -m pip install [-e] .
xflo-test

Run the code using:

xflo-run your_script.py

xflo-run automates the creation of a workspace directory and is not stricly necessary. your_script.py should contain instructions for initializing and running xFlo. This can be achieved using the API init_xflo method. Typical usage is illustrated in tests and examples.

Examples

Transonic flow around the RAE 2822 airfoil.

Comparison between xFlo and SU2. Left: NACA 0012 airfoil at 1.25° angle of attack angle and Mach 0.80. Right: RAE 2822 airfoil at 2.8° angle of attack angle and Mach 0.73.