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Item type:Publication, Access status: with files , “3Co principle” for fidelity assessment for bulb flat models in ship structural analysis.(Elsevier, 2025); ; ; ; Although bulb flats have been numerically modelled in many ship structural analysis, whether a bulb flat model should be accepted and applied is seldom discussed. Thus, it is worthwhile to investigate the evaluation of numerical models, which can be accomplished by fidelity assessment. However, there has been no systematic fidelity assessment for bulb flat models. This is due to the absence of sufficient information or assessment strategy. To enable this, in this study, a “3Co principle” is introduced as a framework for the fidelity assessment. Moreover, two bulb flat models, namely the shell-only model and the beam & shell model, are fully described with their relevant data. Following this, the fidelities of these two models are gradually examined using the 3Co principle. It is revealed in this study that, the fidelity of bulb flat model can be systematically assessed via the 3Co principle, together with sufficient information. The results of the presented research are believed to provide a sound basis for the use of bulb flat models in future applications regarding non-linear ship structural analysis.Publicationtype: Journal Article24 28 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Combining H-adaptivity with the element splitting method for crack simulation in large structures(Multidisciplinary Digital Publishing Institute (MDPI), 2022-01-01); ; ; ; H-adaptivity is an effective tool to introduce local mesh refinement in the FEM-based numerical simulation of crack propagation. The implementation of h-adaptivity could benefit the numerical simulation of fatigue or accidental load scenarios involving large structures, such as ship hulls. Meanwhile, in engineering applications, the element deletion method is frequently used to represent cracks. However, the element deletion method has some drawbacks, such as strong mesh dependency and loss of mass or energy. In order to mitigate this problem, the element splitting method could be applied. In this study, a numerical method called ‘h-adaptive element splitting’ (h-AES) is introduced. The h-AES method is applied in FEM programs by combining h-adaptivity with the element splitting method. Two examples using the h-AES method to simulate cracks in large structures under linear-elastic fracture mechanics scenario are presented. The numerical results are verified against analytical solutions. Based on the examples, the h-AES method is proven to be able to introduce mesh refinement in large-scale numerical models that mostly consist of structured coarse meshes, which is also beneficial to the reduction of computational resources. By employing the h-AES method, very small cracks are well represented in large structures without any deletions of elements.Publicationtype: Journal ArticleScopus© Citations 3 83 257