MATHEMATICAL MODELLING OF TECHNOLOGICAL PROCESSES AND SYSTEMS

Adoption of a digital approach for ship-shape simulation trials with CFD

  • 1 Nikola Vaptsarov Naval Academy, Bulgaria

Abstract

The prediction of maneuverability is a classic problem in ship hydrodynamics. Likewise, ship motions in restricted waters have been studied for a long time. It is an indisputable fact that full-scale or model tests of the respective ship meet IMO requirements and provide the necessary information for the maneuverability of the ship in deep unconfined waters. However, they are unable to provide practical insight into understanding of ship maneuverability in shallow water, as the maneuvering behavior of a ship in such areas differs significantly. Ship maneuvering in coastal areas and harbor approaches, where space is limited, movement speeds are low, and traffic heavier requires deeper researching. The aim of the present work is to predict the hydrodynamic derivatives in the mathematical model of the maneuvering of ship in shallow waters based on CFD programs with free access like FreeCAD, OpenFOAM and ParaView.
The sequence of solving the task is described with details in this work:
1. Generating the shape of the studied body 2. Creating the domains around the experimental body, sizes and boundaries
3. Defining the continuum, areas and subareas of study, and boundary conditions 4. Generation of the computational grid
5. Defining the continuum – physical models 6. Selection of the calculation algorithm 7. Substances modeling 8. Motion modeling.
9. Modeling of currents and energy 10. Flow turbulence modeling.
Results have been obtained for the linear hydrodynamic derivatives in the mathematical model for the maneuvering motion of a ship.
They are compared with available experimental and theoretical data in the literature.

Keywords

References

  1. Лефтерова, M. Изследване на приложимостта на CFD в динамиката на флуидите на основата на анализ на обтичането на тестово тяло. Годишник на Технически университет, Варна, 2010.
  2. Nakayama, Y., Boucher, R.F. Introduction to fluid mechanics. Butterworth-Heinemann. 1999, ISBN:0340676493.
  3. Wilcox, D. Turbulence Modeling for CFD. DCW Industries, Inc., La Canada, CA, third edition, 2006.
  4. OpenFOAM Foundation. Available from: https://openfoam.org/.
  5. FreeCAD workbench CfdOF. Available from: https://github.com/jaheyns/CfdOF.
  6. ESI OpenFOAM. Available from: https://www.openfoam.com/.
  7. The International Towing Tank Conference. Available from: https://ittc.info/.
  8. Menter, F.R., Langtry, R., Völker, S. Transition Modelling for General Purpose CFD Codes. Flow Turbulence Combust. 2006, 77, 277–303. DOI 10.1007/s10494-006-9047-1.
  9. OpenFOAM, k-omega Shear Stress Transport (SST). Available from:https://www.openfoam.com/documentation/guides/latest/d oc/guide-turbulence-ras-k-omega-sst.html.
  10. ParaView. Available from: https://www.paraview.org/.

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