Comparison of Wind Tunnel Model Loads on Membrane and Spherical Tank LNG Carriers (eBook)

Published Date

January 1982

Comparison of Wind Tunnel Model Loads on Membrane and Spherical Tank LNG Carriers (eBook)

(Excludes any applicable taxes)

This paper argues the case for wind tunnel studies on models as a way of introducing cost economies during the design process. (10pp)

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A wind tunnel study was performed on two different LNG carrier designs.

The primary objective of the study was to compare, for two different carrier designs, the total wind forces acting on the carrier which were induced by the wind at different wind exposure angles. A secondary objective of this study was to provide a visual picture of the difference in flow patterns of particles over each of the two carriers. This was accomplished by the injection of helium bubbles into the wind flow within the wind tunnel. Time lapse photographs were taken and are presented herein. A motion picture was also made which shows the mylar streamer flow in the wind tunnel as a function of time.

It is clear, from a structural engineering perspective, that significant differences in wind forces will result in added costs for structural support facilities. Thus, wind tunnel studies can be a cost effective part of the carrier design process. It is also clear, from a practical viewpoint, that the larger the drag forces on the carrier the more susceptible the carrier will be to an interruption of the loading/unloading operation at the berth. Moreover, a higher wind resistance will result in larger drift forces may have a significant negative effect on a ship's maneuvering capability at low speeds and in harbor facilities.

Paper delivered by:
GC Hart (Englekirk & Hart Consulting Engineers)
JD Raggett (J.D. Raggett Associates Inc)

Prepared for:
Gastech Paris 1982

For over 45 years, the Gastech Exhibition & Conference has been at the forefront of the international gas and LNG market. This world-renowned event is regarded as the most significant meeting place for gas and LNG professionals, where the global industry gathers to do business.

Gastech hosts major IOCs, NOC’s, global utility companies, EPC contractors, shipbuilders, pipeline companies, manufacturers, distributors, technology and service providers, all who play an active role in the global energy value chain.

Title: Comparison of Wind Tunnel Model Loads on Membrane and Spherical Tank LNG Carriers (eBook)
Product Code: 4433g174
Published Date: January 1982

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