Accurate modeling of propellant behavior is critical for understanding launch vehicle dynamics, predicting loads, and developing reliable guidance, navigation, and control (GNC) systems. Traditionally, propellant models for launch vehicles have relied on simplified approaches using point masses, springs, and rigid elements. While effective for earlier one-dimensional beam-based models, these methods have become increasingly limited as modern simulations rely on detailed three-dimensional shell-based models.
In this recorded webinar, ATA Engineering explores Nastran’s Defined Fluid Mass method, which enables engineers to explicitly model fluids using three-dimensional incompressible fluid elements coupled directly with structural elements. This advanced approach captures both fluid mass effects and propellant slosh dynamics, providing a more accurate representation of launch vehicle behavior for loads and dynamics analyses.
Using a generic launch vehicle based on the geometry of the Falcon 9, ATA demonstrates the complete process of creating, verifying, and interpreting a fluid slosh model using Siemens Simcenter Femap as the pre- and post-processor.
To continue learning, register for ATA’s upcoming two-day Advanced Dynamic Analysis with Femap course, where you’ll gain hands-on experience with advanced dynamic analysis techniques and practical workflows:
https://www.ata-e.com/event/advanced-dynamic-analysis-with-femap-for-pre-post-nas220-2/
Watch the on-demand webinar:
ATA Engineering Speakers:
Daniel Kaminski, Business Development
Marc Eitner, Project Engineer