A Study on Velocity and Pressure Characteristics Behind the Rectangular Resistance Body of Rectangular Shape
2
조회
0
다운로드
6
인용
0
참고문헌
키워드
초록
In this study, we modeled a ship or marine structure into a rectangular resistance body and tried to examine surrounding flow characteristics and pressure distributions behind the resistance body experimentally and investigated pressure characteristics by a 3-dimension numerical simulation. As a result, the reattachment point of the mainstream separated from the upper part and proceeding to the rear part was about x/H=6, but by the influence of the negative pressure area formed behind the resistance body and interference of the flow flowed in winding from left and right, the reattachment point of some flows was formed near x/H=1.33. The perpendicular velocity component behind x/H=0 varies in size with the recycle flow shapes formed from the influence of the resistance body, but generally it shows a negative distribution and there is a decreasing pattern as it goes to the down part. We verified the result of the calculation by comparing the velocity distribution of 3-dimension numerical simulation using a commercial software and the PIV(particle image velocimetry) measurements. In the numerical simulation results, the static pressure characteristic behind the resistance body was proportional to the inflow velocity, and the dynamic pressure shows a similar pattern with constant-velocity from the experiment.
Abstract
In this study, we modeled a ship or marine structure into a rectangular resistance body and tried to examine surrounding flow characteristics and pressure distributions behind the resistance body experimentally and investigated pressure characteristics by a 3-dimension numerical simulation. As a result, the reattachment point of the mainstream separated from the upper part and proceeding to the rear part was about x/H=6, but by the influence of the negative pressure area formed behind the resistance body and interference of the flow flowed in winding from left and right, the reattachment point of some flows was formed near x/H=1.33. The perpendicular velocity component behind x/H=0 varies in size with the recycle flow shapes formed from the influence of the resistance body, but generally it shows a negative distribution and there is a decreasing pattern as it goes to the down part. We verified the result of the calculation by comparing the velocity distribution of 3-dimension numerical simulation using a commercial software and the PIV(particle image velocimetry) measurements. In the numerical simulation results, the static pressure characteristic behind the resistance body was proportional to the inflow velocity, and the dynamic pressure shows a similar pattern with constant-velocity from the experiment.
참고문헌 (7)
- S.H.Jang, "A Study on Exhaust Gas Emissions of Marine Diesel Engine(1)", Journal of the Kangwon Province College, 7~12 (1999)
- S.H.jang, "A Study on Exhaust Gas Emissions of Marine Diesel Engine(2)", Journal of the Kangwon Province College, 27~33 (2000)
- B.C.Kim, "Flow visualization study on the dispersion of a Cross Flow Jet issued into stratified flows", 석사, pp.1998
- Susan A.Polsky, "Application and Verification of Internal Boundary Conditions for Antenna Mast Wake Predictions", Journal of Wind Engineering and Industrial Aerodynamics, 96, pp.817~830 (2008)
- K.R.Reddy, "Numerical Simulation of Ship Airwake", Journal of Computers & Fluids, 451~465 (2000)
- Kyung Chun Kim, "Investigations of Aerodynamic Effect on Plume Behavior of Vessel with L-Shape Funnel", Proc. Of Korea Wind Engineering, 173~179 (1999)
- S.B. Choi, "A Study on Vortex Shedding Characteristics of a Submerged Vertical Plate", Proc. of the KOSME 2009 First, 380~390 (2009)