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On numerical uncertainty of VOF-RANS simulations of wave energy converters through V&V technique

Claes Eskilsson (Institutionen för mekanik och maritima vetenskaper) ; Johannes Palm (Institutionen för mekanik och maritima vetenskaper) ; Lars Bergdahl (Institutionen för mekanik och maritima vetenskaper)
Proceedings of the 12th European Wave and Tidal Energy Conference 27th Aug -1st Sept 2017, Cork, Ireland (2309-1983). p. 1021-1--9. (2017)
[Konferensbidrag, refereegranskat]

Computational fluid dynamics (CFD) is becoming an increasingly popular tool in the wave energy sector, and over the last five years we have seen many studies using CFD. While the focus of the CFD studies have been on the validation phase, comparing numerically obtained results against experimental tests, the uncertainties associated with the numerical solution has so far been more or less overlooked. There is a need to increase the reliability of the numerical solutions in order to perform simulation based optimization at early stages of development. In this paper we introduce a well-established verification and validation (V&V) technique. We focus on the solution verification stage and how to estimate spatial discretization errors for simulations where no exact solutions are available. The technique is applied to the cases of a 2D heaving box and a 3D moored cylinder. The uncertainties are typically acceptable with a few percent for the 2D box, while the 3D cylinder case show double digit uncertainties. The uncertainties are discussed with regard to physical features of the flow and numerical techniques.

Nyckelord: Wave energy converters, computational fluid dynamics, verification and validation, numerical uncertainty, spatial discretization error



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Denna post skapades 2017-09-15. Senast ändrad 2017-09-28.
CPL Pubid: 251938

 

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