Full‐scale model investigations into insertion loss of highway noise barriers under different atmospheric conditions

1998 ◽  
Vol 103 (5) ◽  
pp. 2801-2801
Author(s):  
Scott D. Hansen ◽  
Courtney B. Burroughs ◽  
Kenneth E. Gilbert
Keyword(s):  
Insertion Loss ◽  
Full Scale ◽  
Scale Model ◽  
Atmospheric Conditions ◽  
Noise Barriers ◽  
Highway Noise

A model for insertion loss degradation for parallel highway noise barriers

1986 ◽  
Vol 80 (3) ◽  
pp. 855-868 ◽  
Author(s):  
William Bowlby ◽  
Louis F. Cohn
Keyword(s):  
Insertion Loss ◽  
Noise Barriers ◽  
Highway Noise

Scale-model study of the effectiveness of highway noise barriers

2003 ◽  
Vol 114 (4) ◽  
pp. 1947-1954 ◽  
Author(s):  
Todd Busch ◽  
Murray Hodgson ◽  
Clair Wakefield
Keyword(s):  
Scale Model ◽  
Noise Barriers ◽  
Model Study ◽  
Highway Noise

A Review of Studies of Insertion Loss Degradation for Parallel Highway Noise Barriers

1987 ◽  
Vol 28 (2) ◽  
pp. 40 ◽  
Author(s):  
William Bowlby ◽  
Louis F. Cohn ◽  
R. A. Harris
Keyword(s):  
Insertion Loss ◽  
Noise Barriers ◽  
Highway Noise

Effect of mesh on CFD aerodynamic performances of a container ship

2020 ◽  
Vol 20 (3) ◽  
pp. 343-353
Author(s):  
Ngo Van He ◽  
Le Thi Thai
Keyword(s):  
Water Surface ◽  
Reference Model ◽  
Full Scale ◽  
Scale Model ◽  
Container Ship ◽  
Ansys Fluent ◽  
Remarkable Effect ◽  
Aerodynamic Performances ◽  
Mesh Convergence

In this paper, a commercial CFD code, ANSYS-Fluent has been used to investigate the effect of mesh number generated in the computed domain on the CFD aerodynamic performances of a container ship. A full-scale model of the 1200TEU container ship has been chosen as a reference model in the computation. Five different mesh numbers for the same dimension domain have been used and the CFD aerodynamic performances of the above water surface hull of the ship have been shown. The obtained CFD results show a remarkable effect of mesh number on aerodynamic performances of the ship and the mesh convergence has been found. The study is an evidence to prove that the mesh number has affected the CFD results in general and the accuracy of the CFD aerodynamic performances in particular.

Benchmarking of Truss Spar Vortex Induced Motions Derived From CFD With Experiments

2005 ◽  
Author(s):  
John Halkyard ◽  
Senu Sirnivas ◽  
Samuel Holmes ◽  
Yiannis Constantinides ◽  
Owen H. Oakley ◽  
...  
Keyword(s):  
Scale Up ◽  
Vertical Cylinder ◽  
Reynolds Numbers ◽  
Full Scale ◽  
Scale Model ◽  
Current Direction ◽  
Test Results ◽  
Helical Strakes ◽  
Truss Spar ◽  
Scale Data

Floating spar platforms are widely used in the Gulf of Mexico for oil production. The spar is a bluff, vertical cylinder which is subject to Vortex Induced Motions (VIM) when current velocities exceed a few knots. All spars to date have been constructed with helical strakes to mitigate VIM in order to reduce the loads on the risers and moorings. Model tests have indicated that the effectiveness of these strakes is influenced greatly by details of their design, by appurtenances placed on the outside of the hull and by current direction. At this time there is limited full scale data to validate the model test results and little understanding of the mechanisms at work in strake performance. The authors have been investigating the use of CFD as a means for predicting full scale VIM performance and for facilitating the design of spars for reduced VIM. This paper reports on the results of a study to benchmark the CFD results for a truss spar with a set of model experiments carried out in a towing tank. The focus is on the effect of current direction, reduced velocity and strake pitch on the VIM response. The tests were carried out on a 1:40 scale model of an actual truss spar design, and all computations were carried out at model scale. Future study will consider the effect of external appurtenances on the hull and scale-up to full scale Reynolds’ numbers on the results.

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