Solution Verification of CFD Simulations of a Drowning Body at Sea

Ribeiro e Silva, S.; Eça, L.

Publication

Solution Verification of CFD Simulations of a Drowning Body at Sea

2024-06-22Conference paper

dc.contributor.author	Ribeiro e Silva, S.
dc.contributor.author	Eça, L.
dc.date.accessioned	2025-11-17T15:21:53Z
dc.date.available	2025-11-17T15:21:53Z
dc.date.issued	2024-06-22
dc.description.abstract	This works aims at evaluating the ability of assessing drifting of a drowning body at sea using Computational Fluid Dynamics (CFD). This paper is focused on the evaluation of the numerical accuracy of the CFD simulations performed with the Simerics-MP flow solver, i.e., solution verification. The main goal of the paper is to illustrate the challenges found when using a commercial CFD package. The study of the drift of a drowning body at sea involves the simulation of incompressible, two-phase (air and water) flows around a bluff body and so the simplest mathematical model to tackle it is the Reynolds-averaged Navier-Stokes equations using ensemble average to define the mean flow and to average mass and momentum balances. This leads to unsteady flow problems that require integration in space and time. Therefore, numerical errors include contributions from the round-off, iterative, discretization (time and space) and statistical errors. Two simple situations to address the difficulties of estimating numerical uncertainties in the simulation of the drift of a drowning body at sea have been selected: (i) current induced drag forces, no wind and no waves; (ii) wind induced drag forces, no current and no waves. Grid/time refinement studies are performed for the two selected conditions to determine numerical uncertainties of the three selected quantities of interest: the resistance/drag force and the trim (pitch) and sinkage (heave) of the drowning body. It is clear that “default settings” cannot be used for such exercise and that there are small details that may have a significant influence on the estimated uncertainties. Nonetheless, the results show that it is not easy to obtain negligible numerical uncertainties in this type of simulations and so the planned comparison of simulations and experiments to determine the modelling error of CFD will be affected by a significant validation uncertainty.	eng
dc.identifier.citation	Silva, SRE, & Eça, L. "Solution Verification of CFD Simulations of a Drowning Body at Sea." Proceedings of the ASME 2024 Verification, Validation, and Uncertainty Quantification Symposium. ASME 2024 Verification, Validation, and Uncertainty Quantification Symposium. College Station, Texas, USA. May 15–17, 2024. V001T07A002. ASME. https://doi.org/10.1115/VVUQ2024-132630
dc.identifier.doi	https://doi.org/10.1115/VVUQ2024-132630
dc.identifier.isbn	978-0-7918-8776-9
dc.identifier.uri	http://hdl.handle.net/10400.26/59825
dc.language.iso	eng
dc.peerreviewed	yes
dc.publisher	ASME
dc.relation.hasversion	https://asmedigitalcollection.asme.org/VVS/proceedings/VVUQ2024/87769/V001T07A002/1201227
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject	Computational fluid dynamics
dc.subject	Seas
dc.subject	Simulation
dc.subject	Uncertainty
dc.subject	Drag (Fluid dynamics)
dc.subject	Errors
dc.subject	Flow (Dynamics)
dc.subject	Waves
dc.subject	Wind
dc.subject	Modeling
dc.subject	Momentum
dc.subject	Navier-Stokes equations
dc.subject	Spacetime
dc.subject	Unsteady flow
dc.subject	Water
dc.title	Solution Verification of CFD Simulations of a Drowning Body at Sea	por
dc.type	conference paper
dspace.entity.type	Publication
oaire.citation.conferenceDate	2024-05-17
oaire.citation.conferencePlace	Texas A&M Hotel and Conference Center College Station, TX
oaire.citation.title	Verification, Validation, and Uncertainty Quantification Symposium VVUQ 2024
oaire.version	http://purl.org/coar/version/c_970fb48d4fbd8a85