Dissertation/ Thesis
Simulation of In-Flight Rime Icing Using a Non-Body-Fitted Mesh
| العنوان: | Simulation of In-Flight Rime Icing Using a Non-Body-Fitted Mesh |
|---|---|
| المؤلفون: | Geiger, Paul |
| بيانات النشر: | University of Waterloo |
| سنة النشر: | 2020 |
| المجموعة: | University of Waterloo, Canada: Institutional Repository |
| مصطلحات موضوعية: | in-flight icing, rime icing, immersed boundary method, cut-cell method, finite volume method, level set method, non-body-fitted mesh |
| الوصف: | In-flight rime icing occurs when supercooled droplets strike the surface of an aircraft and instantly freeze. This often occurs in the high moisture, cold environments of clouds and is of major concern to aircraft manufacturers and pilots due to safety issues, as the icing degrades the aerodynamic performance of the plane. Rime icing models are important in their own right and as a step towards more complex glaze ice/mixed ice models. Most current commercially available software use boundary-fitted approaches to the air and droplet phases along with a node-displacement method for the boundary. This can cause issues as the node-displacement approach to the boundary can cause tangles in the boundary which are unphysical, and the boundary-fitted methodologies require remeshing after each ice accretion step which can degrade mesh quality and cause crashes. The goal of this thesis is to create a non-boundary-fitted approach towards rime icing simulations. Level set methodologies, which are unsusceptible to tangles, are used to handle the evolution of the boundaries. Static meshes which are Cartesian in the vicinity of the boundary are used, and high Reynolds wall functions are incorporated into the methodology so that the meshes can be made coarser and solutions can be reached faster. This proposed model is implemented via modifications of the OpenFOAM® 5.0 open-source environment. Where possible, results are compared to experimental results and to the commercially available FENSAP-ICE software by ANSYS, Inc. Immersed boundary and cut-cell methodologies are explored for the droplets near the boundary. It was found that the developed cut-cell methodology is about twice as accurate as the immersed boundary method developed and that this is one of the dominant discretization errors in many tests. It was shown that as droplet size goes down, particularly below 10 μm, differences in-between the FENSAP-ICE and the proposed model start increasing, with the total collection efficiency going from 0.2% different in-between the ... |
| نوع الوثيقة: | master thesis |
| اللغة: | English |
| Relation: | http://hdl.handle.net/10012/15810 |
| الاتاحة: | http://hdl.handle.net/10012/15810 |
| رقم الانضمام: | edsbas.377640AD |
| قاعدة البيانات: | BASE |
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edsbas BASE edsbas.377640AD 757 3 Dissertation/ Thesis dissertation 757.017883300781 |
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