---
title: "FluidSim Installation"
description: "- Python >= 3.9 - Virtual environment recommended"
type: skill
canonical_url: https://claudary.paisolsolutions.com/skills/installation-2
source: "Claudary"
difficulty: intermediate
author: "Claude Code Knowledge Pack"
date: 2026-07-10T11:30:12.604Z
license: CC-BY-4.0
attribution: "FluidSim Installation — Claudary (https://claudary.paisolsolutions.com/skills/installation-2)"
---

# FluidSim Installation
- Python >= 3.9 - Virtual environment recommended

## Overview

# FluidSim Installation

## Requirements

- Python >= 3.9
- Virtual environment recommended

## Installation Methods

### Basic Installation

Install fluidsim using uv:

```bash
uv pip install fluidsim
```

### With FFT Support (Required for Pseudospectral Solvers)

Most fluidsim solvers use Fourier-based methods and require FFT libraries:

```bash
uv pip install "fluidsim[fft]"
```

This installs fluidfft and pyfftw dependencies.

### With MPI and FFT (For Parallel Simulations)

For high-performance parallel computing:

```bash
uv pip install "fluidsim[fft,mpi]"
```

Note: This triggers local compilation of mpi4py.

## Environment Configuration

### Output Directories

Set environment variables to control where simulation data is stored:

```bash
export FLUIDSIM_PATH=/path/to/simulation/outputs
export FLUIDDYN_PATH_SCRATCH=/path/to/working/directory
```

### FFT Method Selection

Specify FFT implementation (optional):

```bash
export FLUIDSIM_TYPE_FFT2D=fft2d.with_fftw
export FLUIDSIM_TYPE_FFT3D=fft3d.with_fftw
```

## Verification

Test the installation:

```bash
pytest --pyargs fluidsim
```

## No Authentication Required

FluidSim does not require API keys or authentication tokens.

---

Source: [Claudary](https://claudary.paisolsolutions.com/skills/installation-2) · https://claudary.paisolsolutions.com