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  • 1.
    Andersen, Jacob
    et al.
    Aalborg University; Denmark.
    Eskilsson, Claes
    Aalborg University, Denmark.
    Detached-Eddy Simulation of Normal Flow past Flat Plates: The Influence from Corner Curvature2023In: International Journal of Offshore and Polar Engineering, ISSN 1053-5381, Vol. 33, no 4, p. 359-366Article in journal (Refereed)
  • 2.
    Engsig-Karup, Allan
    et al.
    DTU Technical University of Denmark, Denmark.
    Eskilsson, Claes
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Spectral element FNPF simulation of focused wave groups impacting a fixed FPSO-type body2019In: International Journal of Offshore and Polar Engineering, ISSN 1053-5381, Vol. 29, no 2, p. 141-148Article in journal (Refereed)
    Abstract [en]

    A 3D fully nonlinear potential flow (FNPF) model based on an Eulerian formulation is presented. The model is discretizedusing high-order prismatic – possibly curvilinear – elements using a spectral element method (SEM) that has support foradaptive unstructured meshes. The paper presents details of the FNPF-SEM development, and a model is illustrated toexhibit exponential convergence for steep stream function waves to serve as validation. The model is then applied to the caseof focused waves impacting on a surface-piercing, fixed FPSO-like structure. Good agreement is found between numericaland experimental wave elevations and pressures.

  • 3.
    Sriram, V.
    et al.
    Indian Institute of Technology Madras, India.
    Xu, G.
    RISE Research Institutes of Sweden, Safety and Transport, Safety Research.
    Li, G
    Ningbo University, China.
    A comparative study on the nonlinear interaction between a focusing wave and cylinder using state-of-the-art solvers: Part A2021In: International Journal of Offshore and Polar Engineering, ISSN 1053-5381, Vol. 31, no 1Article in journal (Refereed)
    Abstract [en]

    This paper presents ISOPE’s 2020 comparative study on the interaction between focused waves and a fixed cylinder. The paper discusses the qualitative and quantitative comparisons between 20 different numerical solvers from various universities across the world for a fixed cylinder. The moving cylinder cases are reported in a companion paper as part B (Agarwal, Saincher, et al., 2021). The numerical solvers presented in this paper are the recent state of the art in the field, mostly developed in-house by various academic institutes. The majority of the participants used hybrid modeling (i.e., a combination of potential flow and Navier–Stokes solvers). The qualitative comparisons based on the wave probe and pressure probe time histories and spectral components between laminar, turbulent, and potential flow solvers are presented in this paper. Furthermore, the quantitative error analyses based on the overall relative error in peak and phase shifts in the wave probe and pressure probe of all the 20 different solvers are reported. The quantitative errors with respect to different spectral component energy levels (i.e., in primary, sub-, and superharmonic regions) capturing capability are reported. Thus, the paper discusses the maximum, minimum, and median relative errors present in recent solvers as regards application to industrial problems rather than attempting to find the best solver. Furthermore, recommendations are drawn based on the analysis. 

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