Computational Fluid Dynamics

As an early adopter of new technologies, ACMA has acquired licenses for HELYX by Engys and STAR CCM+ by CD Adapco, both industry-leading Computational Fluid Dynamics (CFD) software packages. To run these specialized programs, we maintain a high-performance computing cluster, equivalent to 16 desktops.

Our advanced analysis capabilities enable us to accurately determine the effect of viscous flows and non-linear waves on vessel hulls and in internal tanks, as well as conduct thermodynamic studies as they apply to LNG tank installations in new builds and existing hulls.

Many of the flow and wave analyses now performed were previously analyzed using models tested in a Tow Tank. Adding CFD capability allows ACMA to have its own “Virtual Tow Tank”. This enables analyses to be done faster, at less cost and earlier in the design cycle for maximum benefit to the client. Furthermore, in many cases, CFD actually does a better job of predicting the loading due to the incumbent limitations in model testing.

CFD analyses are particularly useful in the following types of projects:

• Vessel Resistance prediction

• Vessel Motions prediction in regular and random seas, both stationary and underway

• Hydrodynamic Loading on vessel structures

• Accurate prediction of the viscous effects on moored vessels

• Analysis of sloshing loads inside partially-filled cargo or ballast tanks

• Hull design optimization through flow visualization

• Conjugate Heat Transfer analyses for structures on vessels carrying refrigerated cargo (CNG, LNG or similar)

A responsible design process still includes Tank Testing as part of the program, but the inclusion of a detailed CFD analysis ahead of Tank Testing allows testing to focus on confirmation of the analyses and also provides the engineering team with a clearer picture of what they can expect to see in the model basin.

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