University of Twente Student Theses


Evaluation of ice accretion on a 2D airfoil using commercial and open software

Çakir, T.T. (2018) Evaluation of ice accretion on a 2D airfoil using commercial and open software.

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Abstract:This report contains a comparison between commercial and open source software for ice accretion simulation. The most important goals of the research were to com- pare the differences between the used programs, both for fluid flow simulation as well as particle impingement simulation. Next the phenomena of ice accretion is explained, and the work flow on how ice accretion simulations are run is explained. A short description is given about the Messinger model, which is a simple model to determine the thermodynamic bal- ance, which in turn determines the amount of ice that accumulates on a surface. Then a comparison method is explained that is used in subsequent chapter, to com- pare the iced shape of experimental results, with numerically predicted results. In Chapter 4, simulations using the potential panel method only are shown. The re- sults for the comparisons parameter, using the different simulation options within Multi-ICE are shown. In the best case a relative difference between numerical and experimental data of 30% is achieved. Next, using a precomputed flow field with a commercial program, an ice prediction analysis is performed. In general, the predicted ice is in better accordance with the experimental data, compared to the potential method. The reason being, that the simulation contains in general more physics and can be considered more similar to the actual physics. In the best case a relative difference of 19% between numerical and experimental data is observed. In Chapter 6 the simulation in an open source solver is explained, the results be- tween the commercial solver regarding the flow field, show similar flow field results, however there are slight differences. In the rest of the report, the focus lied on im- pingement analysis. On first sight the difference between the impingements between Multi-ICE and the open source program were expected to be due to the difference in flow field, however this was not the case. Finally, the velocity calculation in the open source program is explained, in further detail. The corresponding files which are used are explained and looking at interme- diate results, showed no wrong values for the forces acting on the particles, neither on the mass. And it is expected that the difference in particle impingements is most likely caused by the numerical integration, which is not adequately done in the open source program. To conclude the different programs have been compared and successful results were obtained, with similar flow fields. However, the particle impingements show significant differences, which did not allow for actual icing simulation in the open source program, rather it was attempted to understand the difference in particle im- pingements. It is expected the problem lies in the time stepping, which is not done in adaptive time steps in the open source code, and implementing such a feature might resolve the particle impingement calculation.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Programme:Mechanical Engineering MSc (60439)
Keywords:airfoils, simulation, CIRA, OpenFOAM, FLUENT, CFD, icing, ice accretion
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