The Solver crahes with no helpful error, but does give the following warning on the iteration before failure:
++
 ****** Notice ****** 
 Newtons method failed to converge in 100 iterations. This 
 occurred while computing the following variable: 
 
 Variable Name : Total Temperature 
 Location Name : sparks 
 Mesh location : VERTICES 
 Mesh entity : 
 Last 3 Changes : 1.26616E+03 1.26326E+03 1.26767E+03 
 Tolerance : 1.0000E02 
 
 The Newton iteration was diverging. The solver will continue 
 with the variable field as it was on the final iteration. If 
 this situation continues you might try decreasing the Netwon 
 iteration under relaxation factor. This can be changed by 
 setting one of the following parameters: 
 
 Temperature : "Constitutive Relation Under Relaxation" 
 Pressure : "Newton Pressure Under Relaxation" 
 
 for your mixture using the definition file editor. 
++
Check the CCL for your combustion calculation. For each domain, the combustion model section might read as follows: In dom1: FLUID MODELS: COMBUSTION MODEL: Eddy Dissipation Model Coefficient B = 0.5 Extinction Temperature = 5000[K]*(1fcomb1)+700[K]*fcomb1 Option = Eddy Dissipation END In dom2: FLUID MODELS: COMBUSTION MODEL: Eddy Dissipation Model Coefficient B = 0.5 Extinction Temperature = 5000[K]*(1fcomb2)+700[K]*fcomb2 Option = Eddy Dissipation END In dom3: FLUID MODELS:COMBUSTION MODEL: Eddy Dissipation Model Coefficient B = 0.5 Extinction Temperature = 5000[K]*(1fcomb3)+700[K]*fcomb3 Option = Eddy Dissipation END Finally, in sparks: FLUID MODELS: COMBUSTION MODEL: Eddy Dissipation Model Coefficient B = 0.5 Extinction Temperature = 5000[K]*(1fcombs)+700[K]*fcombs Option = Eddy Dissipation END The expression fcombs = fcomb1 + fcomb2 + fcomb3 should be added to the CEL section. 

