Table 1: Design comparisons for restricted length and draft for the four containment systems


Particulars LBP (m)


with significant design improvement opportunities. Starting from 2005, the HyperWorks suite of advanced structural design,


Beam (m) Depth (m) Draft (m)


Displacement (t) Lightship (t)


analysis and


optimisation tools were used to improve the design to meet the structural objectives which could not otherwise be attained by the proposed original design. An earlier paper RAMOO, 2009 describes the finite element analysis and optimisation of the CDTS as applied for LNG applications. The design tools (software) used included:


• Op t imi s a t ion Te chniques: Topology Optimisation, Free-Size


• RADIOSS Non Linear Transient Dynamic Analyses for ALE & SPH


• AcuSolve CFD Analyses for Fluid & Heat Transfer analyses


analyses to predict sloshing loads


• HyperStudy (MDO) was used to develop the thermal management


Figure 4: CDTS 210,000m3


Op t imi s a t ion, Size/Ga g e Optimisation


Deadweight (t)


Deadweight Coefficient Cargo Capacity (m3


)


Relative capacity to membrane


Relative capacity to spherical Relative capacity to SPB SHP (kW)


SHP/Capacity


Spherical 285 49


25.9 12


123,090 36,774 86,316 0.701


155,000 86


100 86


30,418 0.196


Membrane 285 47


27.4 12


126,758 34,610 92,148 0.727


170,000 100


116 100


30,771 0.181


IHI SPB 285 49.5 32 12


135,468 41,590 93,878 0.693


170,000 100


119 100


34.206 0.201


CDTS 285 49 28 12


148,881 44,895


103,996 0.699


210,000 124


135 128


32,896 0.157


strategy such as position, locations, and volume of LNG spray-in.


Altair and its partners are currently


actively marketing the CDTS to shipowners and working with shipyards and tank fabricators to investigate fabrication and integration solutions. NA


concept design for 300m LOA and 49m beam restriction


Authors Thomas Lamb (Emeritus Research Scientist and Adjunct Professor, Univ. of Michigan, Ann Arbor), is the original inventor of the CDTS. Regu Ramoo (VP of Engineering at Altair ProductDesign), is the CDTS program manager.


The Naval Architect March 2016


25


Feature 1


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