4 research outputs found
A Comparative Study on the Nonlinear Interaction Between a Focusing Wave and Cylinder Using State-of-the-art Solvers: Part A
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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Comparative study on focusing wave interaction with cylinder using QALE-FEM and qaleFOAM
The paper presents a numerical comparative study on the interaction between focusing waves and a cylinder using a hybrid solver, qaleFOAM, which couples a fully nonlinear potential theory (FNPT) and an incompressible two-phase Navier-Stokes model using a domain decomposition coupling approach. The former is solved by using the Quasi Lagrangian Eulerian Finite Element Method (QALE-FEM) and the latter is solved using the OpenFOAM by the finite volume method with the volume of fluid for identifying the free surface. In this paper, one-way coupling is used in qaleFOAM. For the purpose of comparison, the simulation using the QALE-FEM alone is also carried out. Both results are compared with the experimental data, contributing to the numerical comparative study organized by ISOPE 2020. Good agreements are achieved. Furthermore, the significance of the viscous and turbulent effects is also discussed
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Numerical Simulation of Interaction Between Focusing Waves and Cylinder Using qaleFOAM
The paper presents a numerical simulation on the interaction between focusing waves and a cylinder using a hybrid solver, qaleFOAM, which couples a fully nonlinear potential solver, QALE-FEM, with an incompressible two-phase Navier-Stokes solver, OpenFOAM, using the domain decomposition approach. In the qaleFOAM, the wave is generated using a piston wavemaker in a large domain governed by the QALE-FEM (FNPT domain), and propagates into a small sub-domain near the cylinder, in which the OpenFOAM is employed, before it enters the downstream of the FNPT domain and is effectively absorbed by a self-adaptive wavemaker at its end. Both the wave elevations and pressure on the cylinder surface are estimated and compared with the experimental data. Good agreement has been achieved. In addition, different numerical configurations have been attempted, aiming to examine the effects of the cylinder surface boundary condition and turbulence modelling for such cases
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A Comparative Study on the Nonlinear Interaction Between a Focusing Wave and Cylinder Using State-of-the-art Solvers: Part A
This paper presents the comparative study carried out for focused waves interaction with the fixed cylinder in ISOPE 2020. The paper discusses qualitative and quantitative comparison between 19 different numerical solvers from various universities across the world for a fixed cylinder. The moving cylinder cases are reported in the companion paper as Part B. The numerical solvers presented in this paper are recent state of the art in the field, mostly developed in-house by various academic institutes. Majority of the participants used hybrid modeling, i.e. a combination of potential flow and Navier-Stokes solvers. The qualitative comparison 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 analysis based on the overall relative error in peak and phase shift in the wave probe and pressure probe of all the 19 different solvers are reported. The quantitative error with respect to different spectral component energy level (i.e., in primary, sub and super harmonic region) capturing capability are reported. Thus, the paper discusses about maximum, minimum and median relative error present in the recent solvers for application to industrial problems rather than attempting to find the best solver. Further, preliminary guidelines are drawn based on the analysis