Smoothed Particle Hydrodynamics Simulations – Fluid and Astrophysics🌌

This repository contains 2D Smoothed Particle Hydrodynamics (SPH) simulations written in C++, developed as part of an MSc project at Panjab University. The project explores SPH's versatility by applying it to two very different domains: classical fluid dynamics and astrophysical gas interactions.

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🧪 Project Overview

The simulations are divided into two parts:

1. Fluid in a Tumbler (Engineering Simulation)

A basic test case simulating water-like fluid behavior in a 2D container. This was implemented to validate the SPH method and test pressure dynamics and particle stability under boundary conditions.

2. Cloud-Cloud Collision (Astrophysics Application)

A more advanced simulation where a stationary V-shaped cloud and a moving rod-shaped cloud collide in 2D. The model tracks how shock compression and cloud interaction lead to the formation of dense clumps, potential precursors to star formation.

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⚙️ Features

• Custom SPH solver written in C++
• 2D particle initialization for both fluid container and cloud geometries
• Pressure, gravity, and artificial viscosity terms included
• Uniform initial density and variable velocity fields
• Parallelized using OpenMP
• Frame-by-frame output for visualization

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🔧 Prerequisites

• C++11 or newer compiler (e.g., g++, clang++, or MSVC)
• OpenMP support for parallel execution
  • For GCC/MinGW: use -fopenmp
  • For MSVC: use /openmp

  # To compile 
  g++ -o simulation ccc.cpp -fopenmp -O3 -march=native -ffast-math
  

• Make (optional)
• Python 3 with matplotlib and numpy (for visualization)

  pip install matplotlib numpy

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📁 File Structure

├── CCC
    ├── ccc.cpp                    # Main SPH simulation code (cloud-cloud collision)
    ├── ccc_plotter.py             # Python code for visualisation of ccc (to be kept in same directory as ccc.cpp)

├── FLUID_TUMBLER
    ├── fluid_tumbler.cpp          # Optional fluid containment simulation 
    ├── fluid_tumbler_plotter.py   # Python code for visualisation of fluid_tumbler (to be kept in same directory as fluid_tumbler.cpp)

├── visual                         # GIFs of density maps at various time steps are provided in "visual" folder

├── resources                      # various academic resources used for building this project are provided in "resources" folder