Olivia Schroeder

Finite-Rate Modeling of Air–Carbon Ablation in a Plasma Wind Tunnel

Paul G. McClernan, Olivia Schroeder, Andrea Fagnani, Anthony Knutson et autres

Hypersonic flight produces reactive high-temperature gas in the shock layer, often in a state of thermochemical nonequilibrium. This gas can react with the vehicle’s surface and remove significant amounts of material, known as chemical ablation. The gas–surface interface is often in chemical …

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Stochastic Reconstruction of Thermal Protection Material Properties From Arc-Jet Experiments

Georgios Bellas Chatzigeorgis, Anabel del Val, Olivia Schroeder, Prakash Shrestha et autres

The focus of this work is to revisit the capability of extracting material properties from an arc-jet experimental dataset while acknowledging and modeling uncertainty using cutting-edge methods and algorithms. To achieve this, efficient simulation of the experiments is crucial. Specifically, we focus …

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Coupled Fluid Dynamics and Material Response Simulations for Nitrogen Arc Jet flows

Georgios Bellas Chatzigeorgis, Olivia Schroeder, Joseph Schulz, Grant Palmer et autres

In this study, we are simulating the thermal response of a cylindrical PICA sample encircled with an impermeable graphite ring heated up inside the AHF facility of NASA Ames Research Center. We characterized the experimental conditions in the nitrogen flow environment using …

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Ares: A Coupling Methodology for Ablation Modeling

Olivia Schroeder, Joseph M. Brock, Joseph Schulz, Georgios Bellas-Chatzigeorgis et autres

A multi-physics framework was developed to enable modeling of complex and coupled ablation problems. A methodology for modeling shape change in coupled systems is presented. The approach taken to model gas-surface interactions and translate coupled surface phenomena to physically meaningful boundary conditions …

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Coupled Simulations of Shoulder Ablation of a Conceptual Aeroshell

Prakash Shrestha, Olivia Schroeder, Georgios Bellas-Chatzigeorgis, Joseph Schulz et autres

The current study investigates how uncoupled and coupled numerical simulations of flow dynamics and material response affect ablation around the shoulder region of an entry capsule heatshield in space missions like the Mars Sample Return (MSR) project. A new computational tool named …

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Simulations of A Conceptual MSR-EES Shoulder Recession and Thermal Response

Prakash Shrestha, Olivia Schroeder, Christopher O. Johnston, Eric Stern

View Video Presentation: https://doi.org/10.2514/6.2023-0961.vid The present study demonstrates our in-house material response solver, Icarus's capability to simulate the ablative conditions, including pyrolysis effects due to the interaction between hypersonic boundary layers and the thermal protection system (TPS). A conceptual aeroshell shoulder design, …

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Overview of the material response code Icarus

Joseph Schulz, Georgios Bellas Chatzigeorgis, Eric Stern, Grant Palmer et autres

View Video Presentation: https://doi.org/10.2514/6.2023-1534.vid Icarus is a three-dimensional, unstructured, finite-volume material response solver developed at NASA Ames Research Center and has been verified against other NASA material response tools like FIAT, which have a long history of successfully designing thermal protection system …

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Analysis of Ablation on Boundary Layer Stability of the Reentry F Flight Vehicle

Robert E. Rogers, Olivia Schroeder, Luke J. Melander, Graham V. Candler

View Video Presentation: https://doi.org/10.2514/6.2022-3775.vid Boundary layer stability at hypersonic speeds is sensitive to small flowfield changes. Nose tip ablation has multi-physical effects on the flow field that can potentially stabilize or destabilize the boundary layer by modifying the geometry, introducing additional chemical …

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Material Response Modeling of MMOD Cavities

Olivia Schroeder, Prakash Shrestha, Grant Palmer, Eric Stern et autres

View Video Presentation: https://doi.org/10.2514/6.2022-1908.vid There is an increasing need to predictively model failure modes for thermal protection systems (TPS) driven by high mission reliability requirements as well as increasingly complex or extreme planetary entries. One potential failure mode could arise from TPS …

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A coupled ablation approach using Icarus and US3D

Olivia Schroeder, Joseph M. Brock, Eric Stern, Graham V. Candler

View Video Presentation: https://doi.org/10.2514/6.2021-0924.vid A novel approach for modeling hypersonic flow fields and material response in a coupled manner is developed and demonstrated in this work. The procedure leverages modern programming techniques such as application programming interface to create minimally intrusive pathways …

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Numerical Simulation of an Arc Jet Test Section

Ümran Düzel, Olivia Schroeder, Huaibao Zhang, Alexandre Martin

High-fidelity modeling tools are essential for accurate predictions of planetary entry. The same tools can also be used to interpret ground test data. A hypersonic aerothermodynamic computational fluid dynamic code is used to compute the flowfield of a high-enthalpy flow facility, and …

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Implementation and Verification of a Surface Recession Module in a Finite Volume Ablation Solver

Justin M. Cooper, Olivia Schroeder, Haoyue Weng, Alexandre Martin

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