design analyses and optimisation studies that reflect the most demanding environments. Solutions from ANSYS help naval architects design new hulls, appendages, sails, propellers, platforms, cargo spaces and other marine components. Marine engineers face special


challenges as their designs must withstand a range of physical forces, dynamic loads and transient conditions. ANSYS offers powerful capabilities to address these challenges and is continually adding, refining and improving its design capabilities. Following is a discussion of some of the recent innovations at ANSYS soſtware that will help naval architects overcome their growing design challenges.


Improved support for large simulations Geometrically modelling the complexities of a ship is obviously a numerically large, complex task. When the dynamics of wind, waves and temperature are added, these virtual models grow even larger. Improved performance for large models is now a primary focus of ANSYS, in order to reduce product development cycle times and launch design innovations faster than ever. Naval archite c ts


rely on


high-performance computing (HPC) environments to conduct their complex simulations, and ANSYS software is designed to deliver maximum speed and efficiency across multiple computing processors


and technology clusters.


Several enhancements have taken place to improve ANSYS soſtware’s capabilities for geometry import, modelling and data transfer between ANSYS Design- Modeller and other applications in ANSYS Workbench, the integrated framework upon which ANSYS simulation technology is built. With bi-directional CAD connectivity,


highly automated meshing algorithms, project-level update capabilities and built-in optimisation tools, ANSYS sof tware supports high-fidelity simulations at both the component and system levels. Naval architects can study transient problems, such as a series of wave cases, via tree hierarchies. By sharing data seamlessly among different systems, naval architects can carry out a


The Naval Architect October 2012


Figure 3: Stress intensity results of the decompression chamber (courtesy of Subsea 7)


series of different analyses — such as static structural studies, modal analysis and random vibration — in a single workflow that maximises speed and efficiency. ANSYS customers have leveraged HPC


environments and enhanced ANSYS technologies to achieve significant reductions in their simulation runtimes, particularly when running distributed tasks


across multiple processors.


Fluid-structure interaction problems that rely on computational fluid dynamics (CFD) studies are now easier to set up, solve and post-process with ANSYS CFX and Fluent software. In Workbench, popular CFD solution methods share a common workflow, where interaction with other products is enabled through controlled workflows. This


reduces


the learning curve for naval architects who want to use both CFD technology and structural engineering solutions. Fluid-structure interactions can be modelled and verified faster than ever.


Customised capabilities for marine applications While many recent technology enhancements benefit all users, ANSYS is also focused on improving its capabilities that are targeted specifically at marine applications, including its ANSYS Aqwa and ANSYS Asas Both Aqwa and Asas have seen major


changes in the last few years, while even more capabilities will be added in the future. For instance, a wealth of accumulated knowledge from customer implementations of Asas


technology


has now been completely incorporated into ANSYS Workbench. Enhancements include more user-friendly modelling, the ability to import geometries from


third-party CAD packages, in-place analysis with easy input parameterisation, efficient load definition, the ability to account for ebb and tide, and the option to choose from as many as seven wave theories. New progressive workflows standardise and simplify the overall modelling experience. ANSYS Design-Xplorer also offers


improved capabilities for conducting optimisation studies. A new Direct Optimisation System gathers information via data links to other systems or components that contain design-point data — reducing the time needed for optimisation, without altering the original geometry. This new system supports


earlier decision-making,


decreasing overall development time and eliminating a lengthy trial-and-error design cycle. Engineers can easily visualise the trade-offs among design variables and make choices that support their desired result by answering a series of what-if questions. Figure 1 demonstrates how a number of design variables can be considered when building a jacket structure with Design-Xplorer. ANSYS Design Assessment is an analysis


system in Workbench that now includes the company’s code-checking soſtware for the marine industry, ANSYS Beamcheck and ANSYS Fatjack. Design Assessment supports code checking, fatigue analysis and post-processing of user-defined results. Post-processing speed has been significantly improved, decreasing from minutes to seconds. Results can now be obtained and presented in a single result object, based on multiple intervals, wave cases or spectra. ANSYS designed its Splinter technology to


support simulation of single soil piles or pile groups, including group interaction effects via the soil medium. New built-in macros enable soil-pile interaction analysis via the use of command objects. Post-processing results allow for more efficient handling of large models, straightforward set-up, and intuitive data management, while Asas commands remain in the code to facilitate the transition between Asas and Workbench. Figure 2 shows a soil-pile interaction model post-processed in Mechanical, the same tools as for every other analysis are now available.


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