Global/Local Flow Measurement System for Free-running Models for Added Powering/Speed Loss, Course Keeping/Maneuvering and Instability/Capsize in Regular/Irregular Variable Heading Waves
Abstract
Global/Local Flow Measurement System for Free-running Models for Added Powering/Speed Loss, Course Keeping/Maneuvering and Instability/Capsize in Regular/Irregular Variable Heading Waves Program Manager: Dr. Thomas Fu Directorate: Office of Naval Research 1. Abstract This DURIP application is for an instrumented-model measurement system for the IIHR— Hydroscience & Engineering (IIHR), University of Iowa wave basin facility. The system would enable experimental investigations of added powering/speed loss, course keeping/maneuvering, and instability/capsize for modern and next-generation surface combatants, container, and highspeed water jet propelled catamaran free running model ships, including global and local flow measurements in regular/irregular variable heading waves, using integrated computational fluid dynamics (CFD). This system is necessary to advance our simulation capabilities and to enable out-of-the box ship designs to meet the challenges of the next-generation ship performance criteria, which include advanced capabilities and safety and cost constraints. The proposed instrumentation includes precise measurement systems for fully appended self-propelled models, including integrated radio control systems for the free running model, carriage and wave maker, propulsor thrust/torque and free surface mapping and 6DOF visual motion capturing. The system will further enable experimental/CFD studies focusing on the effects and correlations of ship type, Froude number, and waves (length, height, regular/irregular, and heading) on hull/appendage/propulsor unsteady forces/moments, trajectories/motions, hull boundary layer and wake, and propeller-hull-rudder interaction. CFD fills in the sparse experiments, which in turn provide benchmarks for CFD validation. Systems based method mathematical models will be improved using integrated experiments/CFD system identification. The proposed system supports IIHR’s internationally recognized innovative research and research-related educational program in integrated CFD code development, experimental fluid dynamics, uncertainty analysis, and shape optimization for naval hydrodynamics simulation based design. The instrumentation supports current ONR grants and international NICOP, NATO AVT and CFD validation workshop collaborations, which use IIHR experimental data and validate the highfidelity CFDShip-Iowa URANS/DES toolbox capabilities. The instrumentation would be a key component of the IIHR wave basin, and would help ensure its continuation as a unique asset for basic science and naval technology research.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512916
Entities
People
- Frederick Stern
Organizations
- Office of Naval Research
- United States Navy
- University of Iowa