168
K. S. Vepa and N. V. S. S. Sagar
(a) At the centre
(b) At the first threading
Fig. 5 Velocity contours for sphere with seam and threading
Table 2 Computational time
Model
CPU time
Plain sphere
4 h 56 min
Sphere with seam
6 h 59 min
Sphere with seam and threading
12 h 35 min
4.2 Computational Time
Table 2 gives us the computational cost associated with each of the simulations. All
the simulations have been carried out on Intel
® Xeon
® CPU with 6 cores with 16 GB
DDR3 RAM. It is observed in Table 1 that the number of elements needed to model
the ball with threading is more compared to plain sphere. Hence the computational
cost associated with simulating two-piece cricket ball is higher compared that of the
other two models.
4.3 Drag Force
Drag force is considered as a performance measurement in aviation industry. In the
case of cricket as a sport, drag will define the trajectory of the ball. Table 3 gives
the results of drag calculations on different ball configurations and velocities. Drag
coefficient values for the plain sphere match with that of the theoretical values as
Table 3 Drag force and drag coefficient results
Speed (km/h) Drag force (N)
Drag coefficient
Plain sphere Sphere with seam Sphere with seam and
threading
Plain sphere
80
0.536
0.727
1.554
0.450
100
0.853
1.166
2.329
0.459
120
1.248
1.721
3.547
0.466
K. S. Vepa and N. V. S. S. Sagar
(a) At the centre
(b) At the first threading
Fig. 5 Velocity contours for sphere with seam and threading
Table 2 Computational time
Model
CPU time
Plain sphere
4 h 56 min
Sphere with seam
6 h 59 min
Sphere with seam and threading
12 h 35 min
4.2 Computational Time
Table 2 gives us the computational cost associated with each of the simulations. All
the simulations have been carried out on Intel
® Xeon
® CPU with 6 cores with 16 GB
DDR3 RAM. It is observed in Table 1 that the number of elements needed to model
the ball with threading is more compared to plain sphere. Hence the computational
cost associated with simulating two-piece cricket ball is higher compared that of the
other two models.
4.3 Drag Force
Drag force is considered as a performance measurement in aviation industry. In the
case of cricket as a sport, drag will define the trajectory of the ball. Table 3 gives
the results of drag calculations on different ball configurations and velocities. Drag
coefficient values for the plain sphere match with that of the theoretical values as
Table 3 Drag force and drag coefficient results
Speed (km/h) Drag force (N)
Drag coefficient
Plain sphere Sphere with seam Sphere with seam and
threading
Plain sphere
80
0.536
0.727
1.554
0.450
100
0.853
1.166
2.329
0.459
120
1.248
1.721
3.547
0.466