The conventional rotary component for marine propulsion, the propeller, is not always simple. Some marine applications require variable-pitch propellers; some propellers must be adjustable for navigation in close quarters. The installation may take a nontraditional form, such as shrouded or ducted. Propulsion may come from a water jet system. The 21st century marine engineer will likely encounter a broad range of challenges.

Propeller velocity field

Courtesy CDI-SDD.

A systems approach is the key to successful design. The breadth of high-fidelity analysis tools hosted within the ANSYS integrated platform provides the ideal environment for this challenging task.

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Efficiency Efficiency

The energy required for marine propulsion is substantial. For example, supertankers transport huge cargoes, and each new cruise ship is larger than the one before. Operators are demanding improved efficiency, since fuel represents a significant and, at times, volatile cost.

Propeller inflow vectors 

Courtesy CDI-SDD.

Noise Reduction Noise Reduction

For some applications, quiet operation is important. Hydraulic machines generate noise via blade wakes and shed vortices as a result of cavitation. Reducing this noise begins with an in-depth understanding of the flow; it also involves quickly testing a variety of concepts for improving flow quality and range of operation.

ANSYS tools provide the efficiency, accuracy and breadth of physics required to evaluate such sophisticated phenomena.

Streamline traces of  airflow into and out of propeller shroud show that inflow comes primarily from well above deck with additional inflow recirculated from the aft deck tailgate.

Courtesy CDI-SDD.

Water Jet Propulsion Water Jet Propulsion

A variety of applications use water jet propulsion, ranging from recreational watercraft to marine landing vehicles. The heart of the water jet propulsion system is a pump — axial, mixed flow or centrifugal. 

Developing an effective and efficient system requires, first of all, an optimal pump impeller, one that works in conjunction with the entire system as well as with the individual components: inlet, flow ducting, stationary components (stators, etc.) and exit nozzle. 

Blade Geometry Blade Geometry

ANSYS BladeModeler provides tools for the detailed geometric specification of propeller or pump blades. These tools can be used within the ANSYS Workbench environment or connected into an existing design system, enabling high-productivity design and analysis, including optimization.

CFD analysis of marine propeller

Courtesy Delta Marine.

Meshing Meshing

General-purpose and specialized tools from ANSYS enable rapid development of high-quality meshes required for rotating applications. For marine pumps, ANSYS TurboGrid is the tool of choice for optimal high-quality hexahedral blade row meshes that are scalable, consistent, repeatable and automatically generated. 

Throughflow Solver Throughflow Solver

The ANSYS throughflow solver ANSYS VISTA TF is ideal for rapid and reliable water-jet propulsor blade rows. A wide selection of models and access to the same post-processing as full ANSYS CFD technology ensures wide applicability and high-productivity usage.

Rotordynamics Rotordynamics

Rotordynamics capability is a central element in the ANSYS structural solver. Availability of axisymmetric as well as full 3-D element types enables a scalable modeling approach adaptable to any situation, offering the ability to incorporate seal and bearing effects.  

Automated Turbo Pre- & Post-Processing Automated Turbo Pre- & Post-Processing

Rotating machinery blade row-specific pre- and post-processing simplify the turbo design process and reduce overall simulation time. All general and rotating machinery-specific functions are available in a modern graphical user interface or via command, ideal for repeatable, automated operation.