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3.3 Simulations using CosmosFloWorks Figure 26: A Propeller with Three Blades Once the propeller geometry is fully described and satisfactory, CFD simulation work can begin using the SolidWorks application "CosmosFloWorks". CosmosFloWorks is an easy-to-usc nuid-now simulation and thennal analysis program that is fully embedded in Solidworks. CosmosFloWorks can be used to simulate thrust, which is one of the most important parameter in a propeller design. Based on rcal experimental settings that wcrc introduced in chapter 2, a simulation structure is created in CosmosFloWorks. Because CosmosFloWorks doesn't allow to set up the velocity parameter for a solid part, it cannot simulate the motion ofthe carriage as described in chaptcr 2. Instead, the nuid velocity is controlled in order to simulate the carriage motion. For example, ifthe test carriage moves at 2 mls forwards, CosmosFloworks can set up that the propeller is fixed with the 60
fluid moving at 2 mls backwards. Thc resolution ofthe automatic meshing is controlled through settings in CosmosFloWorks. The resolution level can be set to various levels with finer and finer granularity. The software does not pennit detailed configuration of the mesh around particular geometric features. A higher level of resolution breaks the simulation domain into more small elements and can provide much more accurate results but it also requires significantly more computational effort. Detcnnination ofthe exact flows, stresses and deflections in areas such as the trailing edge ofthe blades (where there arc very fine geometric features) would benefit from an ability to adjust the mesh size locally. The simulation settings and assumptions are provided in the following lists: • Analysis type is external for propeller simulation. (ie. Fuild flows outside of propeller) Water is used as the fluid domain. • The only considered physical features arc gravity and rotation, acceleration of gravity g=9.81 mls 2 The temperature of water is 293.2 K. The air pressure is 101325 Pa. Pressure potential is considered. Assume no cavitation is in the simulation Assume adiabatic waJl is used. The simulation structure is shown in Figure 27. This simulation model providcs the watcr domain, which scrves the same function as the tow·tank in the real experiment. 61
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A Rapid Development Process for Mar
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Table of Contents Abstract ... Ackn
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List ofTables Table I: Required Inp
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Figure 46: Surface Dynamic Pressure
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Simulation work is now commonly don
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Early theoretical analysis applied
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Page 47 and 48: Table 3: Prototyping Technology Mat
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Page 59 and 60: Using OpenPVL_SW I a propeller desi
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Page 75 and 76: simulation domain are set to 6m and
Page 79: CosmosWorks can be used to check th
Page 82: Figure 33: Dynamic Pressure Distrib
Page 88: Chapter 4 Case Study: Simulation of
Page 94 and 95: The plots of RPM and thrust from ou
Page 96 and 97: Figure 46: Surface Dynamic Pressure
Page 98: Figure 48: Deflection ofthe AUV Pro
Page 102: In this simulation, two nose cones
Page 110 and 111: Chapter 6 Propeller Fabrication by
Page 112 and 113: Figure 60: Stratasys rDM 2000 After
Page 115 and 116: Material options for Stratasys Fusi
Page 117 and 118: Chapter 7 Conclusions and Future Wo
Page 119 and 120: References III Burtner, E., 1953, "
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[20] D'Epagnier, P.K., 2005, "A Com
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Appendix 1\: The Part ofOpcnPVL_SW
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Create all of the function commands
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Appendix B: SolidWorks Macro lor th
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