Global and Local Flow Experiments for Free Running ONRT and KCS Transient Maneuvering in Calm Water and Waves
Abstract
The NATO Specialist Team for Seaway Mobility (ST/SM) has developed a standard agreement (STANAG) for naval ships. The STANAG specifies mission-oriented criteria, i.e., maneuvering abilities are required to meet various speeds, missions, ship sizes, and environmental conditions such as transit and patrol, harbor maneuvering, anti-submarine warfare, anti-air warfare, anti-surface warfare, minewarfare, and vehicle interaction. The maneuvering ability definitions include: (1) course keeping; (2) track keeping; (3) turning;(4) initial turning; (5) yaw checking; (6) turning from rest; (7) stopping; (8) acceleration; (9) astern course keeping; (10) station keeping; (11) lateral transfer; (12) standard deviation of navigational error; and (13) turning at rest. Criteria values are provided for each of these maneuvers, which are to be assessed via either experiments or predictions during the design stage and ultimately full-scale trials and operational performance. Thus, it is of utmost importance to ensure both experimental and prediction accuracy and physical understanding of the required maneuvering capabilities. The maneuvering abilities (1) and (3) are steady state and were previously studied, whereas (2), (10), (11), (12) are currently considered to be beyond the scope of the present project. Thus, herein we focus on maneuvering abilities (4) and (5) (hereafter referred to as zigzag maneuver); (7) stopping (hereafter referred to as stopping by propeller reversing); (6), (8), and (13) (hereafter referred to as acceleration turning); and (9) (hereafter referred to as backing motion with steering). Assessment of the state-of-the-art experimental capabilities and prediction tools will provide insight into the possibility to efficiently and effectively design naval ships which comply with the STANAG maneuvering requirements.The objectives and approach of the project are: (1) Leverage/extend current steady state maneuvering physical understanding and experimental and prediction capability for grand challenge of transient maneuvers: (i) zigzag; (ii) stopping by propeller reversing; (iii) acceleration turning; and (iv) backing motion with steering. (i) and (ii) include calm water and waves, whereas (iii) and (iv) will focus on calm water; (2) Investigations of unsteady 3D vortex onset, progression, and interactions; hull, propeller, and rudder and ship motions and wave boundary-layer and wake interactions; effects of environmental conditions (waves and headings); (3) Advancement of experimental and prediction capability and physical understanding; (4) Assess physics and measurement and prediction capability for NATO STANAG mission-oriented transient maneuvering criteria (also hold discussions on acceptance criteria with national and international collaborations), including scale effects via full scale CFD. Explore opportunity to obtain sanitized full scale trail data via national and international collaborations; (5) Improve/develop RoM using multi fidelity and ML&AI via internationalcollaborations; (6) Collaboration with other AVT working groups and international workshops; and (7) Provide capability for improved naval ship designs and aid for standardization activities.The expected outcomes are: (1) Assessment and advancement of experimental and prediction capability and physical understanding; improve/develop RoM using ML&AI; (2) Identify validation metrics and assessthe capability of simulation tools to predict the maneuvers; (3) Provide insight into any discrepancies and input to improve simulation capabilities; (4) Quantify scale effects on some of the maneuvers; and (5) Physics of unsteady 3D vortex onset, progression, and interaction; hull, propeller, and rudder interactions; effects environmental conditions (waves and headings).The impact on DoD capabilities includes improved naval ship design capability, and aid standardization activities.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 24, 2024
- Source ID
- N000142412083
Entities
People
- Frederick Stern
Organizations
- Office of Naval Research
- United States Navy
- University of Iowa