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 June 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

New Products

New Monitoring Network for Scottish Ports

Historically, ferry masters operating off the west coast of Scotland would have to sail to a port and on arrival visually assess the weather and tide conditions

PPG Debuts New Antifoulings

Low-friction, self-lubricating coatings use patented technology to deliver reduced fuel consumption and improved tolerance to idle time.   PPG Protective and

GasLog Partners To Buy Three Vessels

GasLog Partners LP and GasLog Ltd. announced today the closing of the Partnership’s acquisition from GasLog of 100% of the ownership interests in the entities

Marine Equipment

New Binding Law of The Sea Agreement Advanced

WOC Sustainable Ocean Summit (Singapore, 9-11 November 2015) Will Enable Industry to Organize its Input to this Major New Ocean Treaty Development The U.N.

Technip Samsung JV Wins 2 FLNG Project Contracts

The Browse project covers the realization and installation of three FLNG units to develop the Brecknock, Calliance and Torosa fields in the Browse Basin, 425 kilometers North of Broome,

Fjords Processing Bags Johan Sverdrup Contracts

Fjords Processing, headquartered in Norway (Fornebu), has won three contracts for the deliveries of process systems for the Johan Sverdrup development in the North Sea.

Software Solutions

NAPA Streamlines Compliance with Class Design Rules

NAPA Steel and NAPA Designer updated to reduce man-hours and duplication associated with new Common Structural Rules BC&OT   Global maritime software, services

IRClass Offers EEDI Validation Service

IRClass (Indian Register of Shipping) has recently included Energy Efficiency Design Index (EEDI) validation to its service offerings. This is in response to the

Tero Marine Secures Boa Offshore Contract

Tero Marine informs it has secured a multimillion (NOK) contract for delivery of fleet management software to Norwegian shipping company Boa Offshore. The Bergen-based

Underwater Engineering

Technip Samsung JV Wins 2 FLNG Project Contracts

The Browse project covers the realization and installation of three FLNG units to develop the Brecknock, Calliance and Torosa fields in the Browse Basin, 425 kilometers North of Broome,

Fjords Processing Bags Johan Sverdrup Contracts

Fjords Processing, headquartered in Norway (Fornebu), has won three contracts for the deliveries of process systems for the Johan Sverdrup development in the North Sea.

New Imagery Allows Viewers to ‘Tour’ WWII Shipwrecks

High-tech underwater cameras help uncovering the secrets of HMAS Sydney   A recent expedition to survey historic World War II shipwrecks has produced a wealth

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Pipelines Ship Repair Ship Simulators Sonar
rss | archive | history | articles | privacy | 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: 0.1634 sec (6 req/sec)