From a9293c3168f5c6ef74ec9d3ea99b63b545045a7f Mon Sep 17 00:00:00 2001
From: Ray Speth <speth@mit.edu>
Date: Fri, 4 Dec 2015 15:35:05 -0500
Subject: [PATCH] [1D] Use nonzero initial guess for FreeFlame mass flow rate

This helps avoids timestepping errors in the first timestep
---
 interfaces/cython/cantera/onedim.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/interfaces/cython/cantera/onedim.py b/interfaces/cython/cantera/onedim.py
index d06d84903a..42e0b73fc6 100644
--- a/interfaces/cython/cantera/onedim.py
+++ b/interfaces/cython/cantera/onedim.py
@@ -405,6 +405,10 @@ def set_initial_guess(self):
         u0 = self.inlet.mdot/self.gas.density
         T0 = self.inlet.T
 
+        if not self.inlet.mdot:
+            # nonzero initial guess increases likelihood of convergence
+            self.inlet.mdot = 1.0
+
         # get adiabatic flame temperature and composition
         self.gas.equilibrate('HP')
         Teq = self.gas.T