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DNV GL
A 3D viewer lets users investigate flow details

DNV GL brings hull efficiency simulation to desktops

DNV GL has introduced a new ‘Virtual Trial’ application for yards and owners, allowing them to see the computational fluid dynamics (CFD) simulation of hull efficiency at their desktops.

The CFD simulation can analyse, compare and benchmark the fuel efficiency of hull design variants at full-scale, with results available within one week compiled into a web-based report, including the CFD results and hull lines in 3D for more insight into flow details.

DNV GL said that as CFD simulation technology has matured, it has become a viable alternative to traditional model basin tests, while reducing lead time and costs. However, the computer resources and expert knowhow to design and carry out such tests are still not wide spread.

“What we have done with Virtual Trial is to let our customers run CFD simulations, without having to invest in CFD expertise,” said Carsten Hahn, product manager at DNV GL – Maritime. “Virtual trials can be launched in complete anonymity, from anywhere, at any time, by simply uploading the hull geometry file and defining the operating profile.”

Users of the Virtual Trial can conduct fully automated full-scale RANSE (Reynolds-averaged Navier-Stokes equations) VoF (Volume of Fluid) CFD simulations on the resistance and propulsion of their vessel.

Users can also upload individual vessel hull forms, run simulations with pre-set parameters and then easily compare their results against the results of similar vessels in the Virtual Trial database. Whether for a newbuilding or retrofit project, Virtual Trial reduces the barriers to full-scale CFD simulation testing and comparative benchmarking.

Uwe Hollenbach of DNV GL – Maritime said: “Design offices and ship yards can analyze and benchmark different hull options during the conceptual design phase, then track how design changes affect a vessel’s hydrodynamic performance.

“Shipowners can easily compare competing design proposals during the bidding process, gaining an impartial assessment of the designs at a fraction of the cost and lead time of model tests. For vessels in service, it could even act as a performance certificate, showing potential charterers or buyers how a vessel might perform within their operating profile.”

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