models/drag.py

import numpy as np

c_d = 0.47       # drag coefficient balloon (spherical) [-]

def drag(c_d, rho_air, d_b, v):
    return 0.125 * np.pi * c_d * rho_air * (d_b * v) ** 2
Directory for sub-models 2021-01-11 10:54:24 +01:00			`import numpy as np`

			`c_d = 0.47 # drag coefficient balloon (spherical) [-]`

updated model-files and user-input-file 2021-02-15 21:47:42 +09:00			`def drag(c_d, rho_air, d_b, v):`
			`return 0.125 * np.pi * c_d * rho_air * (d_b * v) ** 2`