To estimate the Cd of the back swimmer and compare it with the assumed Cd of the leading swimmer, a curve fitting based on the application of various polynomials was performed.
The inherent conditions in the leading swimmer were different from the conditions verified in the back swimmer (see Figure 3).
0 m, where the Cd of the back swimmer corresponded to a mean value of 84.
To calculate the distances in which the back swimmer's Cd equals the value of the leading swimmer, a fitting of the Cd curves of the back swimmer was carried out (according to a polynomial function of the values found until the 6 m distance).
The results indicated that the Cd of the back swimmer (considering the various flow velocities) was equal to that by the leading swimmer in distances ranging between 6.
The aims of the present study were: (i) to describe the pressure profile around the swimmers in drafting through CFD analysis; (ii) to assess the drafting distances effect in the Cd; (iii) to assess the distance in which the Cd of the back swimmer is equal to the Cd of the leading swimmer, considering different flow velocities.