New Submarine and SWATH Capabilities for HydroComp NavCad

Posted by Eric Haun
Thursday, December 12, 2013
The screen image displays the data entry table and process buttons.

HydroComp NavCad is a software tool for the prediction and analysis of vessel speed and power performance. It also provides for the selection of suitable propulsion system components – engines, gears and propellers.

A recent development effort has been undertaken to provide new submarine and SWATH performance analysis in NavCad. This includes new definitions for submerged hull form geometry, and the prediction of resistance and hull-propulsor interaction coefficients.

Submerged hull form geometry
The definition of the submerged hulls of submarines and SWATH vessels in NavCad is a new treatment of traditional parametric descriptions of “body-of-revolution” submarine hulls (e.g., Jackson 1992). The traditional parametric data has been expanded to provide for non-cylindrical sections, as well as increased detail of nose geometry. It also includes definition of single strut geometry suitable for SWATH vessels. The figure below describes the overall definition of the hull and strut geometry.

Resistance prediction
NavCad now provides the user with three different resistance prediction methods for bare-hull drag – a SWATH-specific algorithm and two submarine-derived prediction methods. One of the submarine methods is based on HydroComp’s recent reanalysis of the Series 58 tests (including the extended “parallel mid-body series”). On-going HydroComp research for submarine resistance includes a study for added wave-making resistance when running at shallow depth. Added resistance for appendages will leverage NavCad’s existing prediction functions.

Data entry and process

The standard framework for NavCad is built around surface vessels that follow prescribed prediction methodologies. The Submarine/SWATH predictions are treated as supplemental calculations that are “defined” outside of the standard framework. The appropriate performance results array will be calculated and locked, and the prediction method identified in the “Defined” caption.

Summary
This new extension for NavCad is the first of a number of focused “modules” to the standard prediction framework. On-going module development for similar new capabilities includes re-analysis of barge train resistance and new hybrid wave-making codes. The new Submarine/SWATH features are available immediately to all NavCad customers with an active update subscription.
 

Maritime Reporter September 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

New Products

Alu Design to Create Next Generation of Marine Chairs

There’s a new designer in the driving seat at Alu Design. Per Ivar Selvaag, the former Lead Designer at BMW Group and Chief Designer of Peugeot’s concept car division,

NMEA Awards Top Electronic Makers

Marine electronics experts named 11 products in nine categories as winners of the 2014 NMEA Product Awards. Once again, Furuno USA was named Manufacturer of the Year--Support.

Renewable Energy: Schottel Tidal Turbines Ready For Use

In the last months Schottel  successfully tested its hydrokinetic turbines in Strangford Lough, Northern Ireland. The full-scale tests included 260 operating hours under realistic conditions.

Marine Equipment

Interferry Applauds IMO Consideration of BWTS Exemption

Interferry has praised a decision made at last week’s meeting of the IMO Marine Environment Protection Committee (MEPC) that could exempt certain ferry operators

MAN Diesel & Turbo Updates Turbocharger Safety Warning

MAN Diesel & Turbo SE has released an update to Alert Service Bulletin ASB2013/02/18 containing important safety information related to NA and NR type grey cast iron turbochargers.

Wärtsilä Expects 5% Sales Growth

Wärtsilä announced its third quarter results, reporting that it sees good development in order intake and profitability. According to Wärtsilä, third quarter

Software Solutions

GOST Security System thwarts Break-in

GOST (Global Ocean Security Technologies), announced that its GOST Insight HD GPS Security System was instrumental in foiling the theft of electronics onboard a powerboat in Aventura, Florida.

Northrop Grumman Sponsors Maritime RobotX Challenge

Northrop Grumman Corporation is expanding its support for science, technology, engineering and math (STEM) education across the globe by sponsoring the Maritime RobotX Challenge in Singapore, Oct.

New Bahamas Northwest Chart Set Upgrade

nv charts announces the release of its newly updated chart set for Region 9.1, Bahamas Northwest, including Bimini and Berry Islands, Nassau to Abaco, and Grand Bahama,

Underwater Engineering

Nordic Wins with Noble

Nordic Maritime, a leading offshore service operator, today announced a five year time charter for its DP2 IMR Subsea vessel, Mokul Nordic, which has been awarded by Noble Energy,

Pemex Suspends Eviction of Workers in Campeche

Due to the behavior shown by the low pressure system in the Gulf of Mexico, whose career was diverted in the last hours, the Technical Analysis Group Emergency

Virtual AIS Beacons Employed in MH370 Search

Vesper Marine, a manufacturer of marine safety products and virtual Aids to Navigation (ATON), announced that its Virtual AIS Beacons are employed in the search

 
 
Maritime Security Maritime Standards Naval Architecture Navigation Pipelines Port Authority Salvage Ship Electronics Ship Repair Ship Simulators
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1706 sec (6 req/sec)