FYI, I’m Osamah.Drawn towhat’s next.

From airflow to drag.

AeroSim moves air through a 3D lattice with 19 discrete directions per cell. When a flow population hits a solid boundary, it bounces back. That change in momentum gives the force on the body.

1. Measure the momentum change. Reversing a population doubles its momentum transfer. For each fluid–solid link, the solver adds −2 f e to the body force: f is the reflected population and e points back into the fluid.
2. Sum over the surface. Add every boundary contribution. The x component, along the incoming flow, is the drag force F_x, in lattice units.
3. Normalize for comparison. Divide the drag by dynamic pressure times reference area to obtain the dimensionless drag coefficient.

ρ is the reference air density (1 in lattice units), U_ref is the inlet speed with a 0.02 minimum, and S is the reference area. Imported meshes use a frontal-area proxy. The displayed coefficient is smoothed over time.

These are interactive simulation estimates; the project has no benchmark validation or grid-convergence study.