Applicability of Smoothed Particle Hydrodynamics to determine forces on offshore structures
Authors
Højen, Jonas Birkbak ; Büttner, Jonathan ; Hansen, René Skak
Term
4. term
Education
Publication year
2021
Submitted on
2021-06-10
Pages
186
Abstract
This thesis evaluates whether Smoothed Particle Hydrodynamics (SPH) implemented in DualSPHysics can determine hydrodynamic loads on offshore structures more efficiently and accurately than current approaches. The work is motivated by the frequent need for scaled laboratory tests to validate designs before full-scale installation. The method validates DualSPHysics against wave flume experiments: first by analyzing wave propagation, then by quantifying forces on a fixed (restrained) cylinder, and finally by assessing forces and motions of a floating cylinder. Systematic comparisons between measurements and numerical simulations are used to judge accuracy and applicability. The findings indicate that DualSPHysics can supplement existing practice in some cases, particularly for extreme sea states where established calculation methods fall short and laboratory testing is often required. At the same time, the software is still under development and exhibits limitations that affect robustness and usability. The thesis highlights both challenges and advantages and outlines where the technique is currently most beneficial.
Dette speciale undersøger, om Smoothed Particle Hydrodynamics (SPH) implementeret i DualSPHysics kan anvendes til at bestemme hydrodynamiske kræfter på offshorekonstruktioner mere effektivt og præcist end de nuværende metoder. Baggrunden er, at skalaforsøg i laboratorier ofte er nødvendige for at validere design, før installation i fuld skala. Metodisk valideres DualSPHysics mod laboratorieforsøg i en bølgekanal: først gennem analyse af bølgeudbredelse, dernæst ved bestemmelse af kræfter på en fastholdt cylinder, og til sidst ved at evaluere kræfter og bevægelser for en flydende cylinder. Der gennemføres systematiske sammenligninger mellem målinger og numeriske simuleringer for at vurdere nøjagtighed og anvendelighed. Resultaterne peger på, at DualSPHysics i nogle tilfælde kan supplere eksisterende praksis, især ved ekstreme søtilstande, hvor traditionelle beregningsmetoder er utilstrækkelige, og der ofte kræves fysiske forsøg. Samtidig konstateres det, at softwaren stadig er under udvikling og har begrænsninger, som påvirker robusthed og brugervenlighed. Specialet belyser både udfordringer og fordele ved anvendelsen og skitserer, hvor teknikken aktuelt er mest nyttig.
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Keywords