Simulating a Moon Mission Before the Rocket Fires
NASA has detailed how its Launch, Ascent, and Vehicle Aerodynamics (LAVA) computational framework played a critical role in refining the launch environment for Artemis II — the agency's first crewed Artemis mission, which will send four astronauts around the Moon. Using data gathered from the uncrewed Artemis I launch in 2022, engineers at NASA's Ames Research Center ran simulations that revealed previously unknown interactions between the Space Launch System rocket's exhaust plumes and the launchpad water sound suppression system.
The simulations identified a counterintuitive effect: while the sound suppression system's water effectively reduces acoustic pressure waves that could damage the vehicle, the rocket exhaust gases can redirect water streams in ways that create significant pressure increases in specific areas of the mobile launcher platform. Without intervention, these pressure spikes could exceed the structural tolerances of launchpad components.
How LAVA Works
The LAVA framework addresses computational fluid dynamics — the mathematical modeling of how gases and liquids behave. At a rocket launch, the relevant physics is extraordinarily complex: supersonic exhaust gases exit the engines at temperatures exceeding 3,000 degrees Celsius, interact with the steel trench and water deluge system of the launchpad, generate pressure waves that propagate outward at the speed of sound, and induce turbulent mixing that requires specialized algorithms to simulate accurately.
Comparing simulations run with and without the sound suppression system active allowed engineers to isolate its effects precisely. The water reduces overall acoustic loading on the vehicle significantly, but the pressure redistribution caused by exhaust-water interaction identified specific locations on the mobile launcher where reinforcement or design modification was required.
From Simulation to Hardware Modification
The insights from LAVA simulations were not merely academic. Engineers at Kennedy Space Center used the simulation results to redesign specific elements of the Artemis II mobile launcher platform to handle the identified pressure increases. This represents a direct translation from computational modeling to physical hardware modification that will make the crewed mission safer.
The process illustrates why NASA invests heavily in simulation capability rather than relying entirely on empirical testing. Physical testing of rocket launches is enormously expensive and limited in what can be instrumented; computational simulation allows engineers to explore thousands of parameter variations, identify edge cases, and understand root causes in ways that physical experiments cannot.
Release to the Aerospace Community
NASA plans to release LAVA to the broader aerospace community in the coming weeks, extending its utility beyond NASA's own programs to commercial launch companies, aircraft manufacturers, and academic researchers. The tool has already been demonstrated publicly through seminars hosted by NASA's Advanced Supercomputing facility.
For commercial launch providers who typically lack the resources to develop equivalent simulation infrastructure internally, access to LAVA represents a meaningful capability upgrade. The tool could accelerate development timelines for next-generation launch vehicles and reduce the frequency of costly physical test campaigns by enabling more confident pre-test predictions.
This article is based on reporting by NASA. Read the original article.
