[1D] Fix IonFlow docstrings and simplify testIonFlame

AUTHORS

@@ -6,6 +6,7 @@ tracker.
 
 Philip Berndt
 Victor Brunini, Sandia National Laboratory
+Bang-Shiuh Chen, Purdue University
 Steven Decaluwe, Colorado School of Mines
 Thomas Fiala, Technische Universität München
 David Fronczek

interfaces/cython/cantera/examples/onedim/ion_flame.py

@@ -1,6 +1,5 @@
 """
-A freely-propagating, premixed hydrogen flat flame with multicomponent
-transport properties.
+A freely-propagating, premixed methane-air flat flame with charged species.
 """
 
 import cantera as ct
@@ -39,4 +38,3 @@ print('mixture-averaged flamespeed = {0:7f} m/s'.format(f.u[0]))
 
 # write the velocity, temperature, density, and mole fractions to a CSV file
 f.write_csv('CH4_adiabatic.csv', quiet=False)
-

interfaces/cython/cantera/onedim.py

@@ -543,7 +543,7 @@ class IonFlame(FreeFlame):
 
     @property
     def poisson_enabled(self):
-        """ Get/Set whether or not to solve the energy equation."""
+        """ Get/Set whether or not to solve the Poisson's equation."""
         return self.flame.poisson_enabled
 
     @poisson_enabled.setter
@@ -552,7 +552,7 @@ class IonFlame(FreeFlame):
 
     @property
     def velocity_enabled(self):
-        """ Get/Set whether or not to solve the energy equation."""
+        """ Get/Set whether or not to solve the velocity."""
         return self.flame.velocity_enabled
 
     @velocity_enabled.setter

interfaces/cython/cantera/test/test_onedim.py

@@ -870,23 +870,15 @@ class TestIonFlame(utilities.CanteraTest):
 
         # stage one
         self.sim.solve(loglevel=0, auto=True)
-        T1 = self.sim.T[-1]
 
         # stage two
         self.sim.solve(loglevel=0, stage=2, enable_energy=False)
 
         # stage two
         self.sim.solve(loglevel=0, stage=2, enable_energy=True)
-        Electron2 = self.sim.value(self.sim.flame, 'E', self.sim.flame.n_points-1)
 
         #stage three
         self.sim.solve(loglevel=0, stage=3, enable_energy=True)
-        Electron3 = self.sim.value(self.sim.flame, 'E', self.sim.flame.n_points-1)
-        T3 = self.sim.T[-1]
 
-        # check Temperature at outlet
-        self.assertNear(T1, T3, 1e-3)
-        self.assertNotEqual(T1, T3)
-        # check Electron concentration at outlet
-        self.assertNear(Electron2, Electron3, 1e-13)
-        self.assertNotEqual(Electron2, Electron3)
+        # Regression test
+        self.assertNear(min(self.sim.E) / max(self.sim.E), -5.0765, 1e-3)