Coffee-cup sloshing model favors aiming the lid opening roughly toward two o’clock in a car

A user says they built a coffee-sloshing simulation with help from an AI coding agent and combined it with 5.3 hours of real vehicle-motion data from Boston and Singapore. The model favored pointing the lid opening roughly toward two o’clock; more broadly, a diagonal angle toward the car’s side performed better than pointing it straight forward or backward. The simulations also suggested that sipping some coffee first helps. The user cautions that measurement remains a bottleneck.