Navy STTR Award

Government POC
Mr. Willam Keith
Email: keithwl@npt.nuwc.navy.mil
Phone: (401)832-5191
Fax: 

 

Principal Investigator
Dr. Georges Chahine
Email: glchahine@dynaflow-inc.com
Phone: (301)604-3688
Fax: (301)604-3689

Corporate Official
Dr. Georges Chahine
Email: glchahine@dynaflow-inc.com
Phone: (301)604-3688
Fax: (301)604-3689

Firm
Dynaflow, Inc.
10621-J Iron Bridge Rd.
Jessup, Maryland 20794-9381
http://www.dynaflow-inc.com

Research Institute



 

Contract #

N00014-06-M-0218 

Topic

N06-T022 

Solicitation

06 

SYSCOM

NAVSEA 

Award Amount

99881.00 

Phase

I 

Program

Navy STTR 

Start / End Date

08/01/2006 - 05/31/2007 

FY Reported

2006 

Title

Waterjet Wake Characterization Suite 

Abstract

Bubble generation and entrainment in the transom region of a surface ship, along its hull, and in breaking waves are major ship signature contributors. For advanced ships such as the LCS, another source of air entrainment is added with the propulsion waterjets interacting with the free surface in the transom region. While significant research on breaking waves bubble generation exists, little is known about waterjet propulsion impact on bubbly wakes. Such wakes provide an excellent opportunity to wake homing torpedoes because of bubbles large acoustic cross section. Therefore, it is imperative to develop computational tools capable of predictive analysis for design optimization of bubbly wakes of waterjet driven ships. DYNAFLOW and ARL at the Pennsylvania State University propose to develop a suite of tools for modeling the waterjet driven ships bubbly wakes, conducting acoustic analysis relevant to wake homing threats, assessing threat performance in engagement simulations and conducting experiments to validate and refine the models. A suite of CFD codes known to reproduce conventional ship wakes properly will be used and modified by adding physical models of the waterjet free surface bubble entrainment mechanisms, which will be developed through experimental observation and modeling.  

Benefit

The proposed tool suite can be used for design evaluation of waterjet propelled surface ships. The developed models for bubble generation, propagation, and acoustics can be also combined with other CFD methods and could benefit commercial sectors such as fast ship industry, food manufacturing, oil and gas industry, chemical industry, etc. 

Taxonomy

 

Keywords

Breaking waves, Surface Ships, waterjet propulsion, engagement simulation, bubbly wake, Acoustic Signature, bubble generation