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Validating CFD surfboard models to experimental results

Duesmann, J.B.C. (2018) Validating CFD surfboard models to experimental results.

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Abstract:As an important step in developing a surfboard performance analyser tool, this internship tried to validate a surfboard CFD model that could be used for a parametric analysis. Simulations were to be compared to towing tank experiments performed in 2011 in which a surfboard in a �xed orientation is moving through water at di�erent velocities. An initial CFD surfboard model was developed in Autodesk CFD, which was improved by investigating simulation results in sub-studies. These helped to draw conclusions on the to be used proper domain, board mesh density, wall layer thickness, turbulence model and advection scheme. Surface roughness was found to be of in uence, but could not be applied con�dently. Mesh independence was not reached due to limited computing power. This - and incorrect wall layer thickness and transition - were thought to be the main reasons for having up to 60% lower drag in the simulations than in the experiments. To improve this, it was recommended to investigate how to correctly implement surface roughness and also improve the mesh by adjusting the board CAD model and using more computing power to solve for smaller elements. To make the model more suitable for a parametric analysis and a more realistic sur�ng situation, modeling waves and motion driven ow might have to be implemented.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Programme:Mechanical Engineering MSc (60439)
Keywords:surfboard performance analyser tool, CFD model, parametric analysis, Simulations, board mesh density, wall layer thickness
Link to this item:http://purl.utwente.nl/essays/85125
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