applications


Predicted von Mises Stress (MPa) from multi-scale four-point bending simulation with five per cent porosity at failure


specific design requirements of the industry. As with many simulation challenges, overdesign can be extremely costly or even prohibitive. Avoiding this necessitates the use of reliable, accurate, analysis and optimisation tools at every stage of the design process. Herdman explained that NOV Elmar


uses many Altair products in its day-to-day workflows: ‘For general analysis work, we use HyperMesh for pre-processing, RADIOSS to solve, and HyperView to post-process.’ However he went on to explain that one of the advantages of using HyperMesh for FEA needs is that it can be used in conjunction with other solvers. Herdman said: ‘Part of our business


regularly uses Ansys for structural design, so HyperMesh can be used for improved mesh


www.scientific-computing.com l


control which in turn leads to more reliable results. For engineering problems, which may lead to issues such as excessive geometric non-linearity, it is great to know we could use another, more appropriate solver and yet still maintain the post-processing capability we require.’ Tis flexibility also extends to the


development of the soſtware itself, as Herdman explained: ‘We also use a jointly developed plug-in at the post processing stage for stress linearisation.’ By working closely with Altair, NOV


Elmar has fine-tuned the soſtware to the specific needs of the oil and gas industry. Herdman said: ‘Pressure vessel design in the oil and gas sector must be carried out in accordance with relevant industrial standards


@scwmagazine


and design codes. Many of these standards are quite prescriptive regarding material choices, allowable factors on material yield, and various other aspects of the product operation and design.’ He continued: ‘Appropriate use of finite


element analysis is also part of such standards and, in particular, a technique called stress linearisation. Tis technique generates stress outputs which are compared to geometry- based allowable stresses in the design code.’


Small details; big differences MultiMechanics has found that users of its soſtware have been using MultiMech soſtware for structural design of Arctic oil rigs, as mentioned earlier. Castro said: ‘Structures used in oil and gas exploration are subjected ➤


DECEMBER 2014/JANUARY 2015 23


MultiMechanics


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32