Experimental and computational study of operation of an amphibious craft in calm water

Suresh Behara; Andrew Arnold; J. Ezequiel Martin; Casey M Harwood; Pablo M Carrica

doi:10.1016/j.oceaneng.2020.107460

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Experimental and computational study of operation of an amphibious craft in calm water

Journal article

Open access

Peer reviewed

Experimental and computational study of operation of an amphibious craft in calm water

Suresh Behara, Andrew Arnold, J. Ezequiel Martin, Casey M Harwood and Pablo M Carrica

Ocean engineering, Vol.209, p.107460

08/2020

DOI: 10.1016/j.oceaneng.2020.107460

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Abstract

The hydrodynamic characteristics of a waterjet-propelled amphibious craft traveling in displacement and planing modes are studied via full-scale experiments and numerical simulations in three ways. First, variations of pitch, resistance, and vertical rise for speeds from 2 to 18 knots are investigated. As speed is incrementally increased, pitch and resistance increase geometrically before maximizing in the transition region. In this region, the computations underpredict pitch, yet resistance matches the steady-state thrust measurements well. Second, maneuverability in displacement mode at 4 knots is investigated with a zigzag maneuver. Time variations of heading, pitch, yaw rate, roll, and roll rate predicted by computational fluid dynamics (CFD) for the zigzag maneuver are in good agreement with the experimental results. Third, the dynamic transition from displacement to planing mode is investigated by abruptly increasing the thrust beyond the craft's peak resistance. Beyond the resistance maximum, the vehicle experiences a sharp increase in speed and drop in pitch angle. Experiment and simulation conclude similarly with an abrupt cut to propulsion, resulting in a quick deceleration, which is overcome by its own wake. Simulated kinematics of the deceleration are remarkably accurate, suggesting valid computations of the transient drag, wake generation, and vehicle response to waves.

Details

Title: Subtitle: Experimental and computational study of operation of an amphibious craft in calm water
Creators: Suresh Behara - University of Iowa
Andrew Arnold - University of Iowa
J. Ezequiel Martin - University of Iowa
Casey M Harwood - University of Iowa
Pablo M Carrica - University of Iowa
Resource Type: Journal article
Publication Details: Ocean engineering, Vol.209, p.107460
DOI: 10.1016/j.oceaneng.2020.107460
ISSN: 0029-8018
eISSN: 1873-5258
Grant note: DOI: 10.13039/100000006, name: Office of Naval Research
Language: English
Date published: 08/2020
Academic Unit: IIHR--Hydroscience and Engineering; Mechanical Engineering
Record Identifier: 9984196542702771

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