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Finite element analysis with orcaflex full#
Clearly, some simplification is required in order for us to be able to solve for the lines without invoking the full finite element method, and that simplification is that the analytic catenary does not account for inertia or bend stiffness. The mooring line loads are calculated from classical analytic catenary equations. To carry out quasi-dynamic analysis in OrcaFlex, you make use of the analytic catenary representation for lines to avoid the full finite element calculation. In addition to the obvious simplification, it is often possible to use the explicit time domain solver with a relatively large time step, while still retaining sufficient accuracy, for such models, leading to further performance gains. It is this reduction in the amount of calculation which leads to the significant reductions in analysis time which can be obtained from quasi-dynamic analysis compared to a full finite element solution. The method is implemented by a number of codes, including ARIANE and MIMOSA.įor a typical quasi-dynamic analysis the only calculated degrees of freedom in the system are those of the vessel. It is a long-established method for mooring analysis, and is described, for instance, in Bureau Veritas NR 493. This form of analysis is known generally as quasi-dynamic analysis. Often, the interest lies only in the vessel and the finer details of the forces acting within the mooring lines are irrelevant: all that matters is to obtain a realistic approximation of the forces applied by the mooring lines to the vessel. Partial Differential EquationsĪs mentioned above, finite element analysis is used to solve partial differential equations, but some PDEs are more suitable.For many applications, such as modelling mooring lines attached to a vessel, the accuracy of the full finite element representation of the line, whereby it is discretised into individual nodes that each carry degrees of freedom, is not required. The points where the values can be determined are called nodal points and can usually be found at the boundary of the element. These approximate calculations are usually polynomial, with interpolations occurring across the small elements, meaning that values can be determined at some but not all points. Each of these small elements is subjected to calculations, with these mesh refinements combining to produce the final result of the whole structure. The simulations used in FEA are created using a mesh of millions of smaller elements that combine to create the shape of the structure that is being assessed. The first development of FEA for real world applications began in the mid-1950s and was further developed over the next few decades. FEA was developed further by engineers from different industries around the world in order to solve a large number of structural mechanics problems, primarily in civil engineering and aerospace. While some theories state that FEA has its roots in the 16th century work of Euler, the earliest mathematical papers directly detailing the technique date back to Schellbach’s work of 1851.
Finite element analysis with orcaflex software#
FEA allows for an approximate solution to these problems.įEA is the basis of modern software simulation software, with the results usually shown on a computer-generated colour scale. Most of the processes can be described using partial differential equations (PDEs), but these complex equations need to be solved in order for parameters such as stress and strain rates to be estimated. With the use of mathematics it is possible to understand and quantify structural or fluid behaviour, wave propagation, thermal transport and other phenomena. These simulations, which are conducted via specialised software, allow engineers to locate potential problems in a design, including areas of tension and weak spots. Click here to see our latest technical engineering podcasts on YouTube.įEA uses mathematical models to understand and quantify the effects of real-world conditions on a part or assembly. FEA is used by engineers to help simulate physical phenomena and thereby reduce the need for physical prototypes, while allowing for the optimisation of components as part of the design process of a project. National Structural Integrity Research Centreįinite element analysis (FEA) is the process of simulating the behaviour of a part or assembly under given conditions so that it can be assessed using the finite element method (FEM).Structural Integrity Research Foundation.