From 3d9112f899cd53d4232544cf2942bed454cff203 Mon Sep 17 00:00:00 2001
From: Ingmar Schoegl <ischoegl@lsu.edu>
Date: Thu, 13 Apr 2023 19:16:32 -0500
Subject: [PATCH] [Python] Use UnstrainedFlow for BurnerFlame

---
 interfaces/cython/cantera/_onedim.pyx | 23 +++++++++++++++++++----
 interfaces/cython/cantera/onedim.py   |  6 +++---
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/interfaces/cython/cantera/_onedim.pyx b/interfaces/cython/cantera/_onedim.pyx
index 5c87b9c6b9..8eaf3b5aa8 100644
--- a/interfaces/cython/cantera/_onedim.pyx
+++ b/interfaces/cython/cantera/_onedim.pyx
@@ -733,6 +733,20 @@ cdef class FreeFlow(_FlowBase):
     _domain_type = "free-flow"
 
 
+cdef class UnstrainedFlow(_FlowBase):
+    r"""An unstrained flow domain. The equations solved are standard equations for
+    adiabatic one-dimensional flow. The solution variables are:
+
+    *velocity*
+        axial velocity
+    *T*
+        temperature
+    *Y_k*
+        species mass fractions
+    """
+    _domain_type = "unstrained-flow"
+
+
 cdef class AxisymmetricFlow(_FlowBase):
     r"""
     An axisymmetric flow domain. The equations solved are the similarity equations for
@@ -794,14 +808,15 @@ cdef class IdealGasFlow(_FlowBase):
 
     .. deprecated:: 3.0
 
-        Class to be removed after Cantera 3.0; replaced by `FreeFlow` and
-        s`AxisymmetricFlow`.
+        Class to be removed after Cantera 3.0; replaced by `FreeFlow`,
+        `AxisymmetricFlow` and `UnstrainedFlow`.
     """
     _domain_type = "gas-flow"
 
     def __init__(self, *args, **kwargs):
-        warnings.warn("Class to be removed after Cantera 3.0; use 'FreeFlow' "
-                      "or AxisymmetricFlow' instead.", DeprecationWarning)
+        warnings.warn("Class to be removed after Cantera 3.0; use 'FreeFlow', "
+                      "'AxisymmetricFlow' or 'UnstrainedFlow' instead.",
+                      DeprecationWarning)
         super().__init__(*args, **kwargs)
 
 
diff --git a/interfaces/cython/cantera/onedim.py b/interfaces/cython/cantera/onedim.py
index 70871a54e0..fea80dab94 100644
--- a/interfaces/cython/cantera/onedim.py
+++ b/interfaces/cython/cantera/onedim.py
@@ -1067,7 +1067,7 @@ def __init__(self, gas, grid=None, width=None):
             Defines a grid on the interval [0, width] with internal points
             determined automatically by the solver.
 
-        A domain of class `AxisymmetricFlow` named ``flame`` will be created to
+        A domain of class `UnstrainedFlow` named ``flame`` will be created to
         represent the flame. The three domains comprising the stack are stored as
         ``self.burner``, ``self.flame``, and ``self.outlet``.
         """
@@ -1080,8 +1080,8 @@ def __init__(self, gas, grid=None, width=None):
 
         if not hasattr(self, 'flame'):
             # Create flame domain if not already instantiated by a child class
-            #: `AxisymmetricFlow` domain representing the flame
-            self.flame = AxisymmetricFlow(gas, name='flame')
+            #: `UnstrainedFlow` domain representing the flame
+            self.flame = UnstrainedFlow(gas, name='flame')
 
         if width is not None:
             grid = np.array([0.0, 0.1, 0.2, 0.3, 0.5, 0.7, 1.0]) * width