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[1D] Use a better default initial grid for FreeFlame

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This initial grid is designed to work well with how the initial profile and
temperature fixed point are set. The only parameter that needs to be
user-specified is the width of the domain.
This commit is contained in:
Ray Speth 2015-12-04 13:18:18 -05:00
parent 7484827f2b
commit de8348ecb2
5 changed files with 18 additions and 10 deletions
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2
doc/sphinx/cython/onedim.rst
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@ -13,7 +13,7 @@ Composite Domains
FreeFlame
^^^^^^^^^
.. autoclass:: FreeFlame(gas, grid=None)
.. autoclass:: FreeFlame(gas, grid=None, width=None)
BurnerFlame
^^^^^^^^^^^

4
interfaces/cython/cantera/examples/onedim/adiabatic_flame.py
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@ -11,7 +11,7 @@ p = ct.one_atm # pressure [Pa]
Tin = 300.0 # unburned gas temperature [K]
reactants = 'H2:1.1, O2:1, AR:5' # premixed gas composition
initial_grid = np.linspace(0.0, 0.03, 7) # m
width = 0.03 # m
tol_ss = [1.0e-5, 1.0e-13] # [rtol atol] for steady-state problem
tol_ts = [1.0e-4, 1.0e-13] # [rtol atol] for time stepping
loglevel = 1 # amount of diagnostic output (0 to 8)
@ -23,7 +23,7 @@ gas = ct.Solution('h2o2.xml')
gas.TPX = Tin, p, reactants
# Flame object
f = ct.FreeFlame(gas, initial_grid)
f = ct.FreeFlame(gas, width=width)
f.flame.set_steady_tolerances(default=tol_ss)
f.flame.set_transient_tolerances(default=tol_ts)

4
interfaces/cython/cantera/examples/onedim/flamespeed_sensitivity.py
View file

@ -14,7 +14,7 @@ p = ct.one_atm # pressure [Pa]
Tin = 300.0 # unburned gas temperature [K]
reactants = 'CH4:0.45, O2:1.0, N2:3.76'
initial_grid = np.linspace(0, 0.03, 5) # m
width = 0.03 # m
tol_ss = [1.0e-9, 1.0e-14] # [rtol atol] for steady-state problem
tol_ts = [1.0e-5, 1.0e-14] # [rtol atol] for time stepping
@ -23,7 +23,7 @@ gas = ct.Solution('gri30.xml', 'gri30_mix')
gas.TPX = Tin, p, reactants
# Flame object
f = ct.FreeFlame(gas, initial_grid)
f = ct.FreeFlame(gas, width=width)
f.flame.set_steady_tolerances(default=tol_ss)
f.flame.set_transient_tolerances(default=tol_ts)

13
interfaces/cython/cantera/onedim.py
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@ -363,16 +363,27 @@ class FreeFlame(FlameBase):
"""A freely-propagating flat flame."""
__slots__ = ('inlet', 'outlet', 'flame')
def __init__(self, gas, grid=None):
def __init__(self, gas, grid=None, width=None):
"""
A domain of type FreeFlow named 'flame' will be created to represent
the flame. The three domains comprising the stack are stored as
``self.inlet``, ``self.flame``, and ``self.outlet``.
:param grid:
A list of points to be used as the initial grid. Not recommended
unless solving only on a fixed grid; Use the `width` parameter
instead.
:param width:
Defines a grid on the interval [0, width] with internal points
determined automatically by the solver.
"""
self.inlet = Inlet1D(name='reactants', phase=gas)
self.outlet = Outlet1D(name='products', phase=gas)
self.flame = FreeFlow(gas, name='flame')
if width is not None:
grid = np.array([0.0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1.0]) * width
super(FreeFlame, self).__init__((self.inlet, self.flame, self.outlet),
gas, grid)

5
interfaces/cython/cantera/test/test_onedim.py
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@ -92,15 +92,12 @@ class TestFreeFlame(utilities.CanteraTest):
tol_ts = [1.0e-4, 1.0e-11] # [rtol atol] for time stepping
def create_sim(self, p, Tin, reactants, mech='h2o2.xml'):
initial_grid = [0.0, 0.001, 0.01, 0.02, 0.029, 0.03] # m
# IdealGasMix object used to compute mixture properties
self.gas = ct.Solution(mech)
self.gas.TPX = Tin, p, reactants
# Flame object
self.sim = ct.FreeFlame(self.gas, initial_grid)
self.sim = ct.FreeFlame(self.gas, width=0.05)
self.sim.flame.set_steady_tolerances(default=self.tol_ss)
self.sim.flame.set_transient_tolerances(default=self.tol_ts)