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

Livorsi Launches New Throttle Lineup

Livorsi Marine introduced the all new Platinum Series throttles, which they say are designed to be more ergonomically comfortable to the operator while being lighter

NAVTOR, AWT Agreement Marks Next Step in E-navigation

NAVTOR has signed an agreement with maritime weather routing specialist Applied Weather Technology (AWT) that will see the two companies integrating their services

BCG Upgrades Virtual GMDSS Simulator

Buffalo Computer Graphics (BCG) Inc. released an updated version of its Virtual Global Maritime Distress and Safety System (VGMDSS) Simulation software. BCG’s VGMDSS

Marine Equipment

Water-cooled WGM Motors From WEG

WEG, a supplier of drive technology, introduced its water-cooled WGM motors to the shipbuilding industry for the first time at SMM 2014. The WGM water-cooled induction motors are compact,

Livorsi Launches New Throttle Lineup

Livorsi Marine introduced the all new Platinum Series throttles, which they say are designed to be more ergonomically comfortable to the operator while being lighter

NAVTOR, AWT Agreement Marks Next Step in E-navigation

NAVTOR has signed an agreement with maritime weather routing specialist Applied Weather Technology (AWT) that will see the two companies integrating their services

Software Solutions

BCG Upgrades Virtual GMDSS Simulator

Buffalo Computer Graphics (BCG) Inc. released an updated version of its Virtual Global Maritime Distress and Safety System (VGMDSS) Simulation software. BCG’s VGMDSS

General Dynamics takes Rudy deLeon on Board

The board of directors of General Dynamics has elected Rudy deLeon to be a director of the corporation, effective September 30, 2014. DeLeon is a senior

New Simulation Tool for Collision Reconstruction

BMT ARGOSS and BMT Surveys, subsidiaries of BMT Group Ltd, the international design, engineering and risk management consultancy, announced an innovative new service

Underwater Engineering

General Dynamics Bags $ 50 mi Submarine Contracts

General Dynamics Advanced Information Systems, a business unit of General Dynamics was awarded two contract modifications totaling $50 million to continue supporting

Swissco Doubles Rig Fleet

SGX Mainboard-listed Swissco Holdings Limited an integrated, international marine services provider, today announced having completed the acquisition of four additional mobile offshore drilling units,

General Dynamics takes Rudy deLeon on Board

The board of directors of General Dynamics has elected Rudy deLeon to be a director of the corporation, effective September 30, 2014. DeLeon is a senior

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Port Authority Shipbuilding / Vessel Construction Winch
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: 0.1542 sec (6 req/sec)