minor restructuring
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# BALLOON
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from input.natural_constants import *
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m_pl = 1728 # payload mass in [kg] herumspielen
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m_film = 1897 # mass balloon film in [kg]
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m_gas = 600 # lifting gas mass in [kg] herumspielen
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V_design = 1120497.6 # maximum fillable balloon volume in [m^3]
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L_goreDesign = 1.914 * V_design ** (1/3)
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# THERMO-OPTICAL
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# BALLOON DATA
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alpha_VIS = 0.024
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m_pl = 917 #2174 # payload mass in [kg] (incl. flight-chain)
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r_VIS = 0.06
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m_bal_init = 540 #500 # initial ballast mass in [kg]
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tau_VIS = 0.916
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m_film = 0.74074232733 * 1838 # mass balloon film in [kg]
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epsilon = 0.1
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FreeLift = 10 # (initial) free lift in [%]
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alpha_IR = 0.1
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tau_IR = 0.86
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r_IR = 0.04
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c_f = 2092 # [J/(kg*K)]
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epsilon_ground = 0.9
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Albedo = 0.1
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T_ground = 288.15
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# DRAG
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#c_d = 0.47 # drag coefficient balloon (spherical) [-]
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c_virt = 0.37
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c_virt = 0.37
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# SIMULATION
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# SIMULATION
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t_end = 100000 #7500 #5000 # maximum simulation time in [s]
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dt = 1.0 #0.01 #0.01 # simulation time step in [s]
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start_height = 384.9 # start altitude in [m]
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start_height = 365.10 # start altitude in [m]
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start_lat = 67.887382 # start latitude in [deg]
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start_lat = 67.889235 # start latitude in [deg]
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start_lon = 21.081452 # start longitude in [deg]
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start_lon = 21.082948 # start longitude in [deg]
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start_utc_old = '2016-07-12 03:17:24.000' # start date and time in UTC
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start_utc = '2016-07-12 03:17:24.000' # start date and time in UTC
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start_utc = '2019-06-19 03:17:24.000' # start date and time in UTC
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p_0 = 101325 # sea-level pressure in [Pa]
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# possible start dates: between May 22 and June 22
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simple = True
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# ONLY IN CASE OF APPLICATION OF SIMPLE MODEL:
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epsilon_ground = 0.95 # ground emissivity
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T_ground = 288.15 # ground temperature
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Albedo = 0.3 # total albedo
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##cc = 0.1 # cloud cover
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m_gas_init = ((m_pl + m_film + m_bal_init) * (FreeLift/100 + 1))/(R_gas/R_air - 1) # lifting gas mass in [kg]
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print("initial gas mass:")
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print(m_gas_init)
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#GROSSER BALLON
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#V_design = 1120497.6 # maximum fillable balloon volume in [m^3]
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#L_goreDesign = 1.914 * V_design ** (1/3)
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#c_ducts = 0.62
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#c_valve = 0.77 # estimated
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#A_ducts = 76.54 # estimated
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#A_valve = 0.140
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#t_open = 20 # time it takes to open vents in [s]
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#t_close = 20 # time it takes to open vents in [s]
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#m_baldot = m_bal_init/1375 # ballast mass drop rate in [kg/s]
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# kleiner Ballon
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V_design = 834497.469 # maximum fillable balloon volume in [m^3]
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L_goreDesign = 1.914 * V_design ** (1/3)
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c_ducts = 0.62
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c_valve = 0.72 # estimated
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A_ducts = 55.743 # estimated
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A_valve = 0.1297
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t_open = 20 # time it takes to open vents in [s]
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t_close = 20 # time it takes to open vents in [s]
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m_baldot = m_bal_init/1375 # ballast mass drop rate in [kg/s]
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# THERMO-OPTICAL
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alpha_VIS = 0.024
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r_VIS = 0.060
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tau_VIS = 0.916
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epsilon = 0.100
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alpha_IR = 0.100
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tau_IR = 0.860
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r_IR = 0.040
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c_f = 2092 # [J/(kg*K)] specific heat balloon film
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# DRAG
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# c_d = 0.47 # drag coefficient balloon (spherical) [-]
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