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Evaluation of ROPES for passing ships including a comparison with CFD results
Van Hoydonck, W.; Delefortrie, G.; Peeters, P.; Mostaert, F. (2016). Evaluation of ROPES for passing ships including a comparison with CFD results. Version 6.0. FHR reports, 15_011. Flanders Hydraulics Research: Antwerp. V, 39 + 3 p. appendices pp.
Deel van: FHR reports. Flanders Hydraulics Research: Antwerp, meer

Beschikbaar in  Auteurs 
Documenttype: Projectrapport

Author keywords
    ROPES; Passing ships

Project Top | Auteurs 
  • Berekening krachten op passerende schepen mbv ROPES potentiaalsoftware, meer

Auteurs  Top 
  • Van Hoydonck, W., meer
  • Delefortrie, G., meer
  • Peeters, P., meer
  • Mostaert, F., meer

Abstract
    In the current research, the ability of ROPES to predict int eraction forces during ship meeting is evaluated. Experimental tests executed in the towing tank of Flanders Hydraulics Research are used as a reference for t he ROPES resu lts. Panel discretizations for two ships (COD and TOE) were generated using Blender. They were selected as they were used in project 00_057 to evaluate the CFD software FINE/Marine for the prediction of interaction forces experienced by passing ships. In addition, a panel discretization for TOZ is generated to evaluate t he ability of ROPES to predict bank effects. The influence of hull panel density is investigated using a coarser and finer version of the initial (medium) discretization. In general, the results show converging trends. The influence of tank walls is investigated using a coarse, medium and fine discretization of the tank wa ll s. Computations using these three tank wall discretizations all give very similar results, from which it is concluded that using the coarsest discreti zation is sufficient for the reference case. The conclusion of the current research is that ROPES is not suitable for static ship-bank interaction computations, but that it can be used to predict interaction forces between meeting ships. However, one should be aware that ROPES uses an inviscid method t hat neglects the free surface. Peak values in the interaction forces are underpredicted by as much as 50%. After application of empirical corrections, the prediction of peak forces are as good as those predicted by CFD.

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