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Investigation into the Wind Loadings applied to a Deep-V Catamaran using Experimental and Numerical Approaches
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Dr David Trodden
Professor Mehmet Atlar
Vranakis E, Axiotis D, Carchen A, Trodden DG, Atlar M
Conference Proceedings (inc. Abstract)
5th International Conference on Advanced Model Measurement Technology for The Maritime Industry (AMT’17)
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The estimation of wind resistance is an essential part in every ship design project. In certain types ofships the aerodynamic forces and moments may contribute up to 10% of the total resistanceencountered by the vessel. This phenomenon leads to increased fuel costs and emissions which, inturn, imposes difficulties for a particular vessel to comply with its financial and regulatoryrequirements. Within the above framework, this project aims to explore the wind forces applied onNewcastle University's Research Vessel, “The Princess Royal”. However, due to the uniqueness ofthe vessel in terms of geometry and shape, none of the already published methods can be employedto accomplish the required task. As a consequence, model tests were conducted in the Wind-Wave-Current (WWC) Tank of Newcastle University, along with a Computational Fluid Dynamics (CFD)Analysis of the full scale ship in ANSYS environment, enabling the determination of the non-dimensional coefficients for Surge and Sway.Four different speeds were examined in model tests between 0° and 360° angles of attack, generatinggraphs of the forces applied on both X and Y directions as well as for the corresponding non-dimensional coefficients. On the other hand, the numerical model was tested in two different speeds,considering twelve angles of attack and producing valuable data for the understanding of the complexaerodynamic phenomena that developed around certain parts of the ship. The obtained results provedto be very successful and reliable as they were consistent with the trends reported on literature,highlighting the speed independence of the non-dimensional coefficients. Furthermore, this study alsoexamined the potential conversion of the WWC Tank into a wind tunnel, which may create furtherindustrial and experimental opportunities for the university. Measurements were considered for thewind profile inside the tank, indicating the presence of an evident boundary layer. Although thederived results imply that the tank may successfully operate as a wind tunnel, further enhancementson the installed equipment may be considered.
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