Accession Number:

ADA199194

Title:

Flow Visualization of the Airwake Around a Model of a TARAWA Class LHA in a Simulated Atmospheric Boundary Layer

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

• Daley, III, William H.

Report Date:

1988-06-01

Pagination or Media Count:

95.0

Abstract:

A qualitative analysis of the airwake of a TARAWA class LHA in a simulated atmospheric boundary layer was conducted using the environmental wind tunnel. Helium bubble flow visualization techniques were employed and a photographic record made of the results. The study utilized a 1205 scale wooden model of the LHA, suitably mounted to a motion simulator able to fix various combinations of pitch, roll and yaw. Helium bubble flow visualization produced excellent photographic results. Yaw angles of 0 deg and 30 deg starboard showed a generally smooth flow pattern with bow trailing vortices, while a yaw angle of 45 deg port displayed areas of significant turbulence and recirculation zones. Keywords Flow visualization, Simulated atmospheric boundary layer, Theses.

Descriptors:

• *WAKE
• *AMPHIBIOUS ASSAULT SHIPS
• *AIR FLOW
• *AIR RESISTANCE
• MOTION
• THESES
• BOUNDARY LAYER
• TURBULENCE
• TRAILING VORTICES
• FLOW VISUALIZATION
• MODEL TESTS
• BUBBLES
• PHOTOGRAPHY
• WIND TUNNEL TESTS
• PATTERNS
• HELIUM
• FLOW
• QUALITATIVE ANALYSIS
• SHIP MODELS
• WIND TUNNELS
• ATMOSPHERES
• RECIRCULATION
• SHIP BOWS
• YAW
• PITCH(MOTION)
• ANGLES
• SIMULATORS
• SIMULATION

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE