CFD

Introduction

This project is a small 3D CFD code in C++ built on a structured Cartesian mesh.

The current simulation path is a transient lid-driven cavity solver advanced in time step by step. The solver stores velocity and pressure at cell centers and uses a projection-style update to enforce incompressibility.

System Design

The code is split into a few small modules. Each module has its own manual.

• Mesh
  Defines the structured 3D grid, geometric spacing, flat indexing, cell centers, and boundary checks.

• Field3D
  Defines scalar storage on the mesh and the memory layout used by the solver.

• FlowState
  Groups the flow unknowns u, v, w, and p into one state object.

• Solver
  Defines the time-marching algorithm, lid-driven cavity boundary conditions, pressure projection, and divergence monitor.

Build

mkdir -p build
cd build
cmake ..
cmake --build .