Generalized Treatment of Energy Accommodation in Gas-Surface Interactions for Satellite Aerodynamics Applications
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910703300902912 |
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| author | Tuttas, Friedrich Traub, Constantin Pfeiffer, Marcel Fichter, Walter |
| author_facet | Tuttas, Friedrich Traub, Constantin Pfeiffer, Marcel Fichter, Walter |
| contents | In the context of satellite aerodynamics in the Very-Low-Earth-Orbit (VLEO) regime, accurate modeling of gas-surface interactions (GSI) is crucial for determining aerodynamic forces and torques. Common models such as Sentman's assume that gas particles are reflected diffusely from a surface, which leads to the incorporation of energy accommodation into the model. This technical note discusses the limitations of existing approaches for handling energy accommodation and provides a generalized treatment thereof that is valid for any molecular speed ratio. A new general expression for the temperature ratio of reflected to impinging particles is derived, which, when used in a GSI model, retains its validity even in hypothermal flows. Additionally, a simplified hyperthermal approximation is presented, proven to be an asymptote of the general expression, and shown to be an improvement upon existing approximations by comparison for a realistic VLEO scenario. The results contribute to a better understanding and modeling of GSI, potentially benefiting scientific investigations and operational applications in satellite aerodynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_11597 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Generalized Treatment of Energy Accommodation in Gas-Surface Interactions for Satellite Aerodynamics Applications Tuttas, Friedrich Traub, Constantin Pfeiffer, Marcel Fichter, Walter Fluid Dynamics Space Physics In the context of satellite aerodynamics in the Very-Low-Earth-Orbit (VLEO) regime, accurate modeling of gas-surface interactions (GSI) is crucial for determining aerodynamic forces and torques. Common models such as Sentman's assume that gas particles are reflected diffusely from a surface, which leads to the incorporation of energy accommodation into the model. This technical note discusses the limitations of existing approaches for handling energy accommodation and provides a generalized treatment thereof that is valid for any molecular speed ratio. A new general expression for the temperature ratio of reflected to impinging particles is derived, which, when used in a GSI model, retains its validity even in hypothermal flows. Additionally, a simplified hyperthermal approximation is presented, proven to be an asymptote of the general expression, and shown to be an improvement upon existing approximations by comparison for a realistic VLEO scenario. The results contribute to a better understanding and modeling of GSI, potentially benefiting scientific investigations and operational applications in satellite aerodynamics. |
| title | Generalized Treatment of Energy Accommodation in Gas-Surface Interactions for Satellite Aerodynamics Applications |
| topic | Fluid Dynamics Space Physics |
| url | https://arxiv.org/abs/2411.11597 |