Conveners
Modelling, Simulation and Tools: Destructive Re-entry Tools
- Julien Annaloro
Modelling, Simulation and Tools: Destructive Re-entry Tools
- Stephane Galera
Modelling, Simulation and Tools: Destructive Re-entry Tools
- There are no conveners in this block
Modelling, Simulation and Tools: Fragmentation, Ablation Phenomena
- Cristina De Persis (ESA)
Modelling, Simulation and Tools: Fragmentation, Ablation phenomena
- There are no conveners in this block
Modelling, Simulation and Tools
- There are no conveners in this block
Modelling, Simulation and Tools
- There are no conveners in this block
At the end of their lifespan, uncontrolled spacecraft eventually re-enter Earth’s atmosphere and demise, totally or partially, due to their interaction with the surrounding flow. The growing population of junk in Earth’s orbits induced space agencies to tackle the space debris issue by imposing increasingly stringent requirements over the years. The recently published standard ESA Space Debris...
The French Space Operation Act (LOS) adopted in 2008 has established a national regime of authorization and supervision for space activities. CNES, the French Space Agency, is in charge of ensuring the right application of this Space Operation Act. In this context, to predict the debris survivability of a space vehicle and its associated fragments during their atmospheric re-entry, and assess...
The risk of fragments surviving a destructive re-entry and impacting on ground, the state of the art around the turn of the millennium was based on thermal protection shield assumptions and limited material ablation testing. A significant amount of research in this field during the last decade indicated that the simplifying assumptions on shape and complex geometries lead to uncertainties of...
At enGits, we have developed an in-house CFD code for compressible flow. From the start, this code has been designed with massively parallel hardware in mind. As a result the code is able to run very large simulations on simple PCs or similar hardware. For example, we are able to run a buffeting simulation with 100 million cells overnight on a single PC. We believe that this is interesting...
Atmospheric re-entry tools and their predictions are increasingly utilized in the satellite design process due to the demand for safe satellite disposal to minimize the rising debris population in orbit. Accurate predictions of re-entry, particularly in aerothermodynamics, are crucial to evaluate the probability of demise and casualty risk associated with re-entering vehicles. Destructive...
As the number of objects in LEO increases, Design for Demise (D4D) becomes an ever-more important philosophy for space engineering which relies upon robust modelling of re-entry processes. Uncertainty Quantification (UQ) is a vital part of ensuring this robustness but is limited by the significant computational costs associated with high-fidelity re-entry simulation and as such most UQ...
DRAMA (Debris Risk Assessment and Mitigation Analysis) is a comprehensive tool for the compliance analysis of a space mission with space debris mitigation standards. As part of the suite DRAMA allows modelling of the re-entry of a spacecraft into the Earth’s atmosphere along with an assessment of ground casualty risk.
Presented herein is an overview of two tools, Event Simulator and...
Dynamic fragmentation is a process during which a material or structure subjected to intense loads fails catastrophically through the initiation, propagation and coalescence of a multitude of cracks. It is a key topic in many fields of engineering, as for instance in aerospace industry, where the outcome of destructive re-entry is of great concern. Robust numerical models are direly needed to...
In recent times, satellite systems boasting thousands of satellites have been launched into orbit. The relatively short lifespan of these satellites, typically lasting only 3-5 years, has lead to increasing chances of in-orbit collisions and overall space cluttering. As the number of space debris experiencing post-mission uncontrolled re-entry rapidly increases, there is growing concern for...
Direct numerical simulations (DNS) are performed by our in-house flow solver INCA (www.inca-cfd.com)(Başkaya et al., Computers & Fluids, 2024) over a 15 degree compression ramp undergoing ablation at Mach 8. The setup is validated against experiments and simulations that considered the laminar flow over an inert ramp. Streamwise vortices, which generate heating-cooling streaks through the...
One of the peculiarities of some space debris materials compared to thermal protection systems is that the ablation of the critical parts of such objects might involve melting and the presence of three phases (gas, liquid, solid). This is the case for glassy and metallic materials. Given the huge properties differences that exist between the gas and the condensed phases and the complex...
Operating satellites in very low earth orbit (VLEO), approximately between 100-300km altitude, has numerous advantages. One advantage is close proximity to earth, which can enable accurate sensing with significantly lower SWaP+C (size, weight, and power + cost). Another advantage is that VLEO is effectively a “self-cleaning-orbit” where unpowered spacecraft will quickly re-enter the atmosphere...
Spent upper stages of launch vehicles are a very large and dangerous class of space debris since they are prone to spontaneous explosions producing many small objects. This makes old upper stages one of the primary targets for future active space debris removal missions. If the initial attitude motion of the target stage is known, e.g., from in-situ measurements exploiting CubeSats, it is...
