Support setting the energy levels with yaml input file for electron-energy-distribution type: Boltzmann-two-term

src/thermo/PlasmaPhase.cpp

@@ -60,6 +60,10 @@ void PlasmaPhase::updateElectronEnergyDistribution()
     } else if (m_distributionType == "isotropic") {
         setIsotropicElectronEnergyDistribution();
     } else if (m_distributionType == "Boltzmann-two-term") {
+        if (!nCollisions()) {
+            // EEDF solver requires collision data; skip if none are defined.
+            return;
+        }
         auto ierr = m_eedfSolver->calculateDistributionFunction();
         if (ierr == 0) {
             auto y = m_eedfSolver->getEEDFEdge();
@@ -324,6 +328,11 @@ void PlasmaPhase::setParameters(const AnyMap& phaseNode, const AnyMap& rootNode)
             auto distribution = eedf["distribution"].asVector<double>(levels.size());
             setDiscretizedElectronEnergyDist(levels.data(), distribution.data(),
                                              levels.size());
+        } else if (m_distributionType == "Boltzmann-two-term") {
+            if (eedf.hasKey("energy-levels")) {
+                auto levels = eedf["energy-levels"].asVector<double>();
+                setElectronEnergyLevels(levels.data(), levels.size());
+            }
         }
     }
 

test/data/air-plasma.yaml

@@ -16,6 +16,15 @@ phases:
     energy-levels: [0.0, 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0, 20.0, 22.0,
       24.0, 26.0, 28.0, 30.0, 32.0, 34.0, 36.0, 38.0, 40.0]
 
+- name: air-plasma-default-ELs
+  thermo: plasma
+  kinetics: gas
+  species:
+  - nasa_gas.yaml/species: [Electron, O2, N2, O2+, N2+, O, O2-]
+  state: {T: 300.0, P: 1 atm, X: {O2: 0.21, N2: 0.79}}
+  electron-energy-distribution:
+    type: Boltzmann-two-term
+
 reactions:
 - equation: O2 + Electron => Electron + Electron + O2+
   type: electron-collision-plasma

test/python/test_thermo.py

@@ -1328,28 +1328,21 @@ def test_elastic_power_loss_change_shape_factor(self, phase):
 
     def test_eedf_solver(self):
 
-        phase = ct.Solution('air-plasma.yaml')
+        phase = ct.Solution('air-plasma.yaml','air-plasma-Phelps')
         phase.TPX = 300., 101325., 'N2:0.79, O2:0.21, N2+:1E-10, Electron:1E-10'
         phase.reduced_electric_field = 200.0 * 1e-21  # Reduced electric field [V.m^2]
         phase.update_electron_energy_distribution()
 
         grid = phase.electron_energy_levels
         eedf = phase.electron_energy_distribution
 
-        reference_grid = np.logspace(-1, np.log10(60))
-
         reference_eedf = np.array([
-            9.1027381e-02, 9.1026393e-02, 9.1025267e-02, 9.1023985e-02, 9.1022523e-02,
-            9.1020858e-02, 9.1015025e-02, 9.1006713e-02, 9.0997242e-02, 9.0986450e-02,
-            9.0974154e-02, 9.0954654e-02, 9.0923885e-02, 9.0888824e-02, 9.0842837e-02,
-            9.0775447e-02, 9.0695937e-02, 9.0578309e-02, 9.0398980e-02, 9.0118320e-02,
-            8.9293838e-02, 8.7498617e-02, 8.3767419e-02, 7.5765714e-02, 6.4856820e-02,
-            5.5592157e-02, 4.9309310e-02, 4.5268611e-02, 4.2261381e-02, 3.9440745e-02,
-            3.6437762e-02, 3.3181527e-02, 2.9616717e-02, 2.5795007e-02, 2.1676205e-02,
-            1.7347058e-02, 1.3022044e-02, 8.9705614e-03, 5.5251937e-03, 3.1894295e-03,
-            1.7301525e-03, 8.4647152e-04, 3.6030983e-04, 1.2894755e-04, 3.7416645e-05,
-            8.4693678e-06, 1.4299900e-06, 1.7026957e-07, 1.3992350e-08, 1.5340110e-09
-        ])
+            0.09103376, 0.09103349, 0.09103313, 0.09103262, 0.09103193,
+            0.09103097, 0.09102965, 0.09102784, 0.09102534, 0.0910219,
+            0.09100814, 0.09098309, 0.09093237, 0.0908309, 0.09062281,
+            0.09005469, 0.08573433, 0.06499493, 0.0473475, 0.0,
+            0.0])
+        reference_grid = np.logspace(-1, np.log10(60), reference_eedf.size)
 
         interp = np.interp(reference_grid, grid, eedf, left=0.0, right=0.0)
 

test/zeroD/test_zeroD.cpp

@@ -193,7 +193,7 @@ TEST(zerodim, test_individual_reactor_initialization)
 
 TEST(zerodim, plasma_reactor_energy)
 {
-    auto sol = newSolution("air-plasma.yaml", "air-plasma-Phelps", "none");
+    auto sol = newSolution("air-plasma.yaml", "air-plasma-default-ELs", "none");
     auto thermo = sol->thermo();
     auto* plasma = dynamic_cast<PlasmaPhase*>(thermo.get());
     ASSERT_NE(plasma, nullptr);