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

Introduction

Materials and Methods

 Mathematical interpretation  Experiments in a flume tank

Mathematical model

The equation of motion

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

Internal force

External force  drag force  sheer force  buoyancy force

drag force

sheer force 向量大小  )( rVV

The angle of attack α Lee CW. Fish. sci. 2002; 68:

buoyancy force

additional mass

Experiments in a flume tank

Model gear

6m 2.2m 1.4m

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

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°

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

Conclusion

Thank you for your attention