Computational Fluid Dynamics Mini-Solver

A high-performance Lattice Boltzmann Method (LBM) fluid dynamics solver built for the web. This project simulates real-time fluid-structure interaction (FSI), allowing you to observe how fluid flows around and interacts with flexible boundaries, all rendered in the browser.

🚀 Project Status: Work in Progress

This simulator is an ongoing research project exploring computational fluid dynamics (CFD) in a web environment. FYI: Not in any means close to done!

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Current Capabilities

• Core Engine: Implementation of the D2Q9 lattice model for fluid simulation.
• FSI (Fluid-Structure Interaction): Supports flexible beam dynamics coupled with fluid flow.
• GPU Acceleration: Uses WebGL 2.0 and GLSL shaders to map velocity fields to visual color maps in real-time.
• Concurrency: Heavy physics computations are offloaded to Web Workers to keep the UI responsive.

📁 Structure

CFDSOLVE/
├── index.html
├── LICENSE
├── src/
│   ├── core/
│   │   ├── BoundaryConditions.js
│   │   ├── FDM.js
│   │   └── LBM.js
│   ├── fsi/
│   │   └── NativeStructure.js
│   ├── render/
│   │   ├── CanvasRenderer.js
│   │   └── WebGLRenderer.js
│   ├── shaders/
│   │   ├── fluid.frag
│   │   └── fluid.vert
│   ├── styles/
│   │   └── glassmorphism.css
│   ├── utils/
│   │   ├── ColorMaps.js
│   │   └── MathUtils.js
│   └── main.js
└── workers/
    └── simulationWorker.js

🛠 Tech Stack

• Language: Vanilla JavaScript (ES6+), GLSL (for shaders).
• Physics: Lattice Boltzmann Method (LBM) using custom CPU-bound solvers.
• Rendering: WebGL 2.0 API.
• Architecture: Multi-threaded communication via Web Workers, asynchronous resource management.

⚙️ How It Works

The engine follows a cyclic four-step physics loop:

1. Force Application: The fluid exerts pressure/drag on the embedded structure.
2. Structure Integration: The structure calculates its deformation and updates its nodal positions.
3. Boundary Update: The updated structure geometry is synced back into the fluid grid.
4. Fluid Step: The LBM solver runs the collision and streaming steps around the new obstacle geometry.

📋 Roadmap

• Optimization: Implement WebAssembly (WASM) for the LBM core to push performance closer to C++.
• Boundary Conditions: Refine bounce-back schemes for higher-fidelity obstacles.
• Visuals: Add pressure-field rendering and vector field overlays.
• UI: Enhance the control panel with preset scenarios (e.g., vortex shedding, airfoil analysis).

👤 Author

Nabil Khondaker

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Built as an experimental high-performance CFD mini-solver. Contributions and feedback are welcome as this project evolves.