Christian Kongsgaard

2021-03-15

In this section we give an overview of expected costs of running a Virtual Wind Tunnel simulation. The scenario we show here, includes cost and time for the meshing task and Virtual Wind Tunnel task, with the specified number of angles, shown in the table below. The time and cost in the tables are approximate and can not be relied upon as absolute.

In this table we change the number cells in the CFD mesh. By increasing the resolution in the mesh the number of cells grow. That both affects the meshing time, but also the time it takes to simulate each angle.

Resolution at Point of Interest

0.7 m

0.7 m

0.25 m

0.25 m

Concurrent CPUs

64

288

288

768

Turnaround Time

45 min

20 min

2 hours

45 min

Iterations

500

500

500

500

Cost

15 €

15 €

150 €

150 €

In this table we change the number of angles that we run in the Virtual Wind Tunnel. While the overall turnaround time stays the same, the cost increases as you add more angles to the simulation. The turnaround stays the same, because all the angles are run concurrently, and we can therefore get all the angles, no matter how many back in the time it takes to simulate one.

Number of Cells

2.5 million

2.5 million

2.5 million

2.5 million

Resolution at Point of Interest

0.7 m

0.7 m

0.7 m

0.7 m

CPUs per Angle

4

4

4

4

Concurrent CPUs

16

32

48

64

Turnaround Time

45 min

45 min

45 min

45 min

Iterations

500

500

500

500

Cost

4 €

8 €

10 €

15 €

In this table we change the number of iterations that we run the simulations for. When everything else stays the same, then increasing the number of iterations proportional increases the time and cost.

Number of Cells

2.5 million

2.5 million

2.5 million

2.5 million

CPUs per Angle

4

4

4

4

Concurrent CPUs

16

32

48

64

Turnaround Time

45 min

65 min

85 min

105 min

Cost

15 €

25 €

35 €

45 €

In this table we change the number of CPUs that we use per angle. That increases the number of CPUs that we run concurrently, but at the same time the simulation time decreases, which means that the overall cost stays the same.

Number of Cells

2.5 million

2.5 million

2.5 million

2.5 million

Concurrent CPUs

64

128

288

384

Turnaround Time

45 min

35 min

25 min

22 min

Iterations

500

500

500

500

Cost

15 €

15 €

15 €

15 €