Current Blockage in Steady Flow: Interaction of Uniform and Sheared Flow with a Porous Body having Uniform and Non-uniform Resistance

Research output: Chapter in Book/Conference paperConference paperpeer-review


This paper presents analysis of steady flow passing through
a porous body in 3D, representing a steady current passing
through a space-frame offshore structure such as an offshore
jacket or a compliant tower. A porous body is used as a proxy
for a space-frame structure to model the effect of current blockage,
which may be interpreted as a global flow and force reduction
relative to the standard Morison drag formulation due
to the presence of the structure as a distributed obstacle. Both
uniform and sheared approach flows are simulated with CFD in
OpenFOAM for a porous body with uniformly distributed resistance.
The behaviour of the blockage due to both types of flow
are compared and contrasted using flow visualisation to illustrate
the interaction of the flow with the body and the evolution
of the resultant wake downstream of the body. The numerical
results are compared with the actuator disc model for uniform
flow due to [8] and the actuator disc model for sheared flow due
to [1]. A porous body with non-uniform vertically distributed
resistance is also considered, and the difference in the flow interaction
relative to body with uniform resistance is analysed
and discussed. The analysis provides the framework for applications
for wind loading on offshore structures such as a spaceframe
during load-out and transportation on a barge, as well as
numerical comparisons for an extension of the [1] model to an
actuator disc with non-uniform resistance.
Original languageEnglish
Title of host publicationProceedings of the 20th Australasian Fluid Mechanics Conference
EditorsGreg Ivey, Nicole Jones, Tongming Zhou
PublisherAustralasian Fluid Mechanics Society
Number of pages4
ISBN (Electronic)9781740523776
ISBN (Print)978-1-74052-377-6
Publication statusPublished - 2016
EventAustralasian Fluid Mechanics Conference - , Australia
Duration: 1 Jan 2011 → …

Publication series

NameProceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016


ConferenceAustralasian Fluid Mechanics Conference
Period1/01/11 → …


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