Delete StandardAtmosphere.py

2021-01-22 15:30:19 +08:00 · 2021-01-22 15:30:19 +08:00 · 0963059303
commit 0963059303
parent 115558097b
1 changed files with 0 additions and 104 deletions
--- a/pyatmos/StandardAtmosphere/StandardAtmosphere.py
+++ b/pyatmos/StandardAtmosphere/StandardAtmosphere.py
@ -1,104 +0,0 @@
-import numpy as np
-
-# physical constants:
-g = 9.80665 # standard gravity acceleration in [m/s^2]
-R = 8314.32/28.9644 # gas constant for dry air in [J/kg/K] from the 1976 United States Standard Atmosphere(USSA) Model
-R_e = 6371000.8 # Earth's volumetric radius in [m]
-# temperature and pressure at the Mean Sea Level(MSL)
-t_msl = 288.15 # temperature in [K]
-p_msl = 101325 # pressure in [Pa]
-h_msl = 0 # altitude in [m]
-    
-def lapse_tp(t_lower, p_lower, lr, h_lower, h_upper):
-    '''
-    Calculate the temperature and pressure at a given geopotential altitude above base of a specific layer.
-    The temperature is computed by the linear interpolation with the slope defined by lapse rates. 
-    The pressure is computed from the hydrostatic equations and the perfect gas law. 
-    See the detailed documentation in http://www.pdas.com/hydro.pdf
-
-    Usage:
-    [t_upper, p_upper] = lapse_tp(t_lower, p_lower, lr, h_lower, h_upper)
-
-    Inputs:
-    t_lower -> [float] temperature in [K] at the lower boundary of the subset in the specific layer
-    p_lower -> [float] pressure in [Pa] at the lower boundary of the subset in the specific layer
-    lr -> [float] lapse rate in [K/m] for the specific layer
-    h_lower -> [float] geopotential altitude in [m] at the lower boundary of the subset in the specific layer
-    h_upper -> [float] geopotential altitude in [m] at the upper boundary of the subset in the specific layer
-    
-    Outputs:
-    t1 -> [float] temperature in [K] at the upper boundary of the subset in the specific layer
-    p1 -> [float] pressure in [Pa] at the upper boundary of the subset in the specific layer
-    
-    Reference: Public Domain Aeronautical Software(http://www.pdas.com/atmos.html) 
-               https://gist.github.com/buzzerrookie/5b6438c603eabf13d07e
-    '''
-    if lr == 0:
-        t_upper = t_lower
-        p_upper = p_lower * np.exp(-g / R / t_lower * (h_upper - h_lower))
-    else:
-        t_upper = t_lower + lr * (h_upper - h_lower)
-        p_upper = p_lower * (t_upper / t_lower) ** (-g / lr / R)
-
-    return t_upper,p_upper
-
-def isa(altitude,altitude_type='geometric'):
-    '''
-    Implements the International Standard Atmosphere(ISA) Model up to 86km. 
-    The standard atmosphere is defined as a set of layers by specified geopotential altitudes and lapse rates.
-    The temperature is computed by linear interpolation with the slope defined by the lapse rate. 
-    The pressure is computed from the hydrostatic equations and the perfect gas law; the density follows from the perfect gas law. 
-
-    Usage:
-    [temperature, pressure, density] = isa(altitude)
-    [temperature, pressure, density] = isa(altitude,'geopotential')
-
-    Inputs:
-    altitude -> [float] altitude in [km]
-
-    Parameters:
-    altitude_type -> [optional, string, default='geometric'] type of altitude. It can either be 'geopotential' or 'geometric'.
-    Relationship between the 'geopotential' and 'geometric' altitude can be found in http://www.pdas.com/hydro.pdf
-
-    Outputs:
-    temperature -> [float] temperature in [K] at the local altitude
-    pressure -> [float] pressure in [Pa] at the local altitude
-    density -> [float] density in [kg/m^3] at the local altitude
-
-    Note: the geopotential altitude should be in [610,84852] m and the geometric altitude should be in [-611,86000] m
-
-    Reference: U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C. 
-               Public Domain Aeronautical Software(http://www.pdas.com/atmos.html) 
-               https://gist.github.com/buzzerrookie/5b6438c603eabf13d07e
-               https://ww2.mathworks.cn/help/aerotbx/ug/atmosisa.html
-    '''
-    altitude = altitude*1e3 # convert [km] to [m]
-    # the lower atmosphere below 86km is separated into seven layers 
-    geopotential_alt = [-610,11000, 20000, 32000, 47000, 51000,71000,84852] # Geopotential altitudes above MSL in [m]
-    geometric_alt = [-611,11019, 20063, 32162, 47350, 51413, 71802,86000] # Geometric altitudes above MSL in [m]
-    lr = np.array([-6.5, 0, 1, 2.8, 0, -2.8, -2])/1e3 # Lapse rate in [K/m]
-    
-    t0,p0,h0 = t_msl,p_msl,h_msl
-
-    if altitude_type == 'geopotential':
-        if altitude < geopotential_alt[0] or altitude > geopotential_alt[-1]:
-            raise Exception("geopotential altitude should be in [-0.610, 84.852] km")
-    elif altitude_type == 'geometric':   
-        if altitude < geometric_alt[0] or altitude > geometric_alt[-1]:
-            raise Exception("geometric altitude should be in [-0.611, 86.0] km") 
-        # convert geometric altitude to geopotential altitude   
-        altitude = altitude*R_e/(altitude+R_e)
-    else:
-        raise Exception("The type of altitude should either be 'geopotential' or 'geometric'")       
-
-    for i in range(len(lr)):
-        if altitude <= geopotential_alt[i+1]:
-            temperature, pressure = lapse_tp(t0, p0, lr[i], h0, altitude)
-            break
-        else:
-            # if altitudes are greater than the first several layers, then it has to integeate these layers first.
-            t0, p0 = lapse_tp(t0, p0, lr[i], h0, geopotential_alt[i+1])
-            h0 = geopotential_alt[i+1]
-
-    density = pressure / (R * temperature)
-    return {'temperature[K]':temperature,'pressure[Pa]':pressure,'density[kg/m^3]':density}