Effects of free surface on development of turbulent boundary layer and wake fields were investigated. By measuring flow field around a surface piercing cylinder in various advance speed conditions in a towing tank, free surface effects were identified. A towed underwater Stereoscopic Particle Image Velocimetry (SPIV) system was used to measure the flow field under free surface. The cross section of the test model was water plane shape of the Wigley hull, of which longitudinal length and width were 1.0 m and 100 mm, respectively. With sharp bow shape and slender cross section, flow separation was not expected in two-dimensional flow. Flow fields near the free-surface and in deep location that two-dimensional flow field was expected were measured and compared to identify free-surface effects. Some planes perpendicular to longitudinal direction near the model surface and behind the model were selected to track development of turbulent boundary layer. Froude numbers of the test conditions were from 0.126 to 0.40 and corresponding Reynolds numbers were from 395,000 to 1,250,000. In the lowest Froude number condition, free-surface wave was hardly observed and only free surface effects without surface wave could be identified while violent free-surface behavior due to wave-induced separation dominated the flow fields in the highest Froude number condition. From the instantaneous velocity fields, Time-mean velocity, turbulence kinetic energy, and flow structure derived by proper orthogonal decomposition (POD) were analyzed. As the free-surface effect, development of retarded wake, free-surface waves, and wave-induced separation were mainly observed.
Skip Nav Destination
ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
July 26–31, 2015
Seoul, South Korea
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5732-8
PROCEEDINGS PAPER
Towed Underwater SPIV Measurement of Flow Fields Around a Surface-Piercing Cylinder With Free Surface Effects Available to Purchase
Jeonghwa Seo,
Jeonghwa Seo
Seoul National University, Seoul, Korea
Search for other works by this author on:
Bumwoo Han,
Bumwoo Han
Hyundai Heavy Industries, Ulsan, Korea
Search for other works by this author on:
Shin Hyung Rhee
Shin Hyung Rhee
Seoul National University, Seoul, Korea
Search for other works by this author on:
Jeonghwa Seo
Seoul National University, Seoul, Korea
Bumwoo Han
Hyundai Heavy Industries, Ulsan, Korea
Shin Hyung Rhee
Seoul National University, Seoul, Korea
Paper No:
AJKFluids2015-20165, V01AT20A001; 5 pages
Published Online:
April 4, 2016
Citation
Seo, J, Han, B, & Rhee, SH. "Towed Underwater SPIV Measurement of Flow Fields Around a Surface-Piercing Cylinder With Free Surface Effects." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1A: Symposia, Part 2. Seoul, South Korea. July 26–31, 2015. V01AT20A001. ASME. https://doi.org/10.1115/AJKFluids2015-20165
Download citation file:
34
Views
Related Proceedings Papers
Related Articles
Large Eddy Simulation of a Flow Past a Free Surface Piercing Circular Cylinder
J. Fluids Eng (March,2002)
On the Physics of Flow Separation Along a Low Pressure Turbine Blade Under Unsteady Flow Conditions
J. Fluids Eng (May,2005)
Separated Flow Transition on an LP Turbine Blade With Pulsed Flow Control
J. Turbomach (April,2008)
Related Chapters
Cooling a Radar’s Electronic Board
Electromagnetic Waves and Heat Transfer: Sensitivites to Governing Variables in Everyday Life
Physical Properties in the Persian Gulf
Proceedings of the 2010 International Conference on Mechanical, Industrial, and Manufacturing Technologies (MIMT 2010)
Antilock-Braking System Using Fuzzy Logic
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3