Elango icoe-2009
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1. The document discusses using a Rankine panel method to accurately estimate unsteady hydrodynamic pressures and wave patterns on a ship hull. 2. Key steps include discretizing the hull and free surface into panels, applying boundary conditions to solve for the velocity potential, and calculating hydrodynamic forces, ship motions, and pressure distributions. 3. Results show the method can satisfactorily calculate exciting forces, ship motions, and diffraction and radiation wave patterns compared to experimental data.
Elango icoe-2009
- 1. Estimation of Unsteady Pressure and Wave by Rankine Panel Method Muniyandy ELANGOVAN Indian Register of Shipping Mumbai INDIA
- 2. HULL
- 3. Aim/Purpose Passenger Comfort Accurate estimation of forces for structural analysis Achieve Required Speed Needed Data Ship Motion Hydrodynamic Forces Resistance & Wave Pattern Ship Design (Hull) Ship Construction Numerical Analysis Model Test
- 4. Ideal (Potential) Flow Assumptions Incompressible Inviscid Irrotational - Discretization of hull and free surface -Distribution of source and dipoles -Apply boundary conditions -Solve the linear system of equation >> Velocity Potential -Calculate required datas Procedure
- 5. PANEL DISCRETIZATION Free Surface Hull
- 6. PANEL AND ITS ARRANGEMENT Perspective view of a ship Grid system on SH and SF Series 60 (cb=0.8)
- 10. Double Body Flow and Unsteady Flow
- 12. SHIP MOTION
- 13. Principal Dimensions Model Series60 Cb=0.8 Volume 0.06032 m 3 Length 2.0 m Breadth 0.8 m Draft 0.122 m LCG 0.0514 m VCG -0.0534 m BM T 0.0625 m BM L 2.3949 m
- 15. (a)cos component (b) sin component WAVE PRESSURE ON THE HULL F n =0.2 , /L = 0.5, = 180 degs F n =0.2 , /L = 1.0, = 180 degs (a)cos component (b) sin component
- 16. (a)cos component (b) sin component F n =0.2 , /L = 0.5, = 180 degs F n =0.2 , /L = 1.0, = 180 degs (a)cos component (b) sin component TOTAL UNSTEADY PRESSURE ON THE HULL
- 17. (a) L = 36 (b) KL = 14 HEAVE RADIATION WAVE PATTERN at F n =0.2 ,
- 18. (a) /L = 0.5, (b) /L = 1.0 DIFFRACTION WAVE PATTERN at F n =0.2 , = 180 degs, H /
- 19. CONCLUSIONS Exciting Forces and Ship Motions are compared with experimental data and it is satisfactory Unsteady Pressure are plotted for F n =0.2 , /L = 0.5, = 180 degs Diffraction wave and Radiation waves show good results from analytical point of view The Present code can be effectively used for seakeeping analysis of ship with forward speed
- 20. THANK YOU