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Calculation of bank effects and wash waves with shipflow
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Simulations with the potential flow panel method module in the ship specific CFD-program Shipflow have been performed. Simulations are made for ships in shallow water, travelling along a vertical or a sloping bank. More than 70 different simulations have been performed using three kinds of hulls: a tanker, a ferry and a catamaran. The goals with the simulations are to estimate the accuracy of the predicted sway-forces, yaw-moments and wash waves, by comparisons with previously made model tests. The accuracy of the wash wave prediction is relatively good exept at critical speeds. The prediction of ship forces is however poor, and as a consequence Shipflow calculations for force estimation in this sort of flow are not recommended. A secondary part of the report deal with the investigation of the spectral energy distribution in wave samples from the above mentioned model tests. The aim of this investigation is to evaluate whether or not the samples contain large amounts of energy in the state of long periodic waves. Long periodic waves are also indeed detected in almost every sample.

Place, publisher, year, edition, pages
2000.
Keyword [en]
Technology, bank effects, waves, ship hydrodynamics, shipflow, potential, flow, panel methods, fluid mechanics, side forces
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-58597ISRN: LTU-EX--00/070--SELocal ID: f2e204d8-846f-4fc4-a1c1-1fb4b7fafaa0OAI: oai:DiVA.org:ltu-58597DiVA: diva2:1031985
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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