print(sample_header)
# Gas model setup
gmodel = GasModel("h2-o2-n2-5sp.lua")
nsp = gmodel.n_species
nmodes = gmodel.n_modes
if debug: print("nsp=", nsp, " nmodes=", nmodes, " gmodel=", gmodel)
print("# Gas properties at the start of the pipe.")
gas0 = GasState(gmodel)
gas0.p = 81.0e3 # Pa
x = 0.0 # m (inlet of duct)
area = duct_area(x)
v = 1230.0 # m/s
gas0.T = 1900.0 # degree K
gas0.molef = {"O2":0.1865, "N2":0.7016, "H2":0.1119}
gas0.update_thermo_from_pT()
dt_suggest = 1.0e-12 # suggested starting time-step for chemistry
print(sample_data(x, area, v, gas0, dt_suggest))
if debug:
print("# species=", gmodel.species_names)
print("# massf=", gas0.massf)
print("# Start reactions...")
reactor = ThermochemicalReactor(gmodel, "h2-o2-n2-5sp-2r.lua")
t = 0 # time is in seconds
t_final = 1.15e-3 # long enough to convect past exit
t_inc = 0.005e-6 # start small
t_inc_max = 0.05e-6
x_end = 2.0
print("# Reacting pipe flow -- Bittker-Scullin test case 3.")
print(sample_header)
# Gas model setup
gmodel = GasModel("h2-o2-n2-9sp.lua")
nsp = gmodel.n_species
nmodes = gmodel.n_modes
if debug: print("nsp=", nsp, " nmodes=", nmodes, " gmodel=", gmodel)
print("# Gas properties at the start of the pipe.")
gas0 = GasState(gmodel)
gas0.p = 96.87e3 # Pa
x = 0.0 # m (inlet of pipe)
v = 4551.73 # m/s
gas0.T = 1559.0 # degree K
gas0.molef = {"O2": 0.1480, "N2": 0.5562, "H2": 0.2958}
gas0.update_thermo_from_pT()
dt_suggest = 1.0e-8 # suggested starting time-step for chemistry updater
print(sample_data(x, v, gas0, dt_suggest))
print("# Start reactions...")
reactor = ThermochemicalReactor(gmodel, "h2-o2-n2-9sp-18r.lua")
t = 0 # time is in seconds
t_final = 22.0e-6
t_inc = 0.05e-6
nsteps = int(t_final / t_inc)
for j in range(1, nsteps + 1):
# At the start of the step...
rho = gas0.rho
T = gas0.T
p = gas0.p
# To prepare:
# $ prep-gas nitrogen-2sp.inp nitrogen-2sp.lua
# $ prep-chem nitrogen-2sp.lua nitrogen-2sp-2r.lua chem.lua
#
# To run:
# $ python3 fvreactor.py
from eilmer.gas import GasModel, GasState, ThermochemicalReactor
gm = GasModel("nitrogen-2sp.lua")
reactor = ThermochemicalReactor(gm, "chem.lua")
gs = GasState(gm)
gs.p = 1.0e5 # Pa
gs.T = 4000.0 # degree K
gs.molef = {'N2': 2 / 3, 'N': 1 / 3}
gs.update_thermo_from_pT()
tFinal = 200.0e-6 # s
t = 0.0
dt = 1.0e-6
dtSuggest = 1.0e-11
print("# Start integration")
f = open("fvreactor.data", 'w')
f.write(
'# 1:t(s) 2:T(K) 3:p(Pa) 4:massf_N2 5:massf_N 6:conc_N2 7:conc_N\n')
f.write("%10.3e %10.3f %10.3e %20.12e %20.12e %20.12e %20.12e\n" %
(t, gs.T, gs.p, gs.massf[0], gs.massf[1], gs.conc[0], gs.conc[1]))
while t <= tFinal:
dtSuggest = reactor.update_state(gs, dt, dtSuggest)
t = t + dt