A comparative study between DNS, LES and PIV for a marine riser with fairings

authored by

Håkon Strandenes, José Patricio Gallardo Canabes, Jan Visscher, Bjørnar Pettersen, Helge I. Andersson, Halvor Lie, Rolf Baarholm

Abstract

This paper present results from numerical simulations and laboratory experiments investigating the flow around a riser with fairings at Reynolds number of 5000. We present fully resolved direct numerical simulations (DNS), large eddy simulations (LES) and compare the results with flowfields obtained from particle image velocimetry (PIV) experiments in a circulating water tunnel. The DNS and LES results do agree very well on surface integral quantities such as drag and lift force, but there are discrepancies in first order statistical flow parameters such as recirculation length. This indicate that a comparison of force coefficients is not sufficient to validate this type of bluff body wake flows. Comparing the simulation data with the experimental PIV data, also reveals significant discrepancies in the mean flow field, although the Strouhal number agrees between DNS and PIV results.

Organisation(s)

Ludwig-Franzius-Institute of Hydraulics, Estuarine and Coastal Engineering

External Organisation(s)

Norwegian University of Science and Technology (NTNU)
Norsk Marinteknisk Forskningsinstitutt AS (Marintek)
StatoilHydro

Type

Conference contribution

Publication date

2015

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Ocean Engineering, Energy Engineering and Power Technology, Mechanical Engineering

Sustainable Development Goals

SDG 14 - Life Below Water

Electronic version(s)

https://doi.org/10.1115/OMAE2015-41494 (Access: Closed)