1. Dynamic simulation of tuna longline gear using numerical methods JIHooN LEE, CHEUN Woo LEE AND BONG JIN CHA FISHERIES SCIENCE, 2005, 71, 1287-1294

2. Introduction

3. Materials and Methods

4.  Mathematical interpretation  Experiments in a flume tank

5. Mathematical model

7. The equation of motion

8. The force vector acting on the mass point  Internal force  External force

9. Internal force

10. External force  drag force  sheer force  buoyancy force

11. drag force

12. sheer force 向量大小  )( rVV

13. The angle of attack α Lee CW. Fish. sci. 2002; 68:1835-1840

14. buoyancy force

15. additional mass

16. Experiments in a flume tank

17. Model gear

18. 6m 2.2m 1.4m

19. Result and Discussion 1.Comparison of simulate and exprmental results 2.Simulation of the actual gear

20. Comparison of simulate and exprmental results K=0.8, α,depth is constant K,V is constant V, α is constant K is constant, α=90°

21. Simulation of the actual gear 527.9m 312.3m 434.8m 978.3m

24. Conclusion

25. Thank you for your attention