combuston in ICE Weller model II

roadracer

Hi all. I have partly fixed my previous problem, but the combustion still doesn´t take place. I am using Regvar-Pr Weller model with standard coefficients. The chemical reaction is C8H18 + 12.5O2 -> 8CO2 + 9H2O Chemico thermal enthalpy is turned on, and I have previously set up an active scalar to trace the burnt gases from previous cycles. The calculation restarts from a pst file of a previous calculation ran without combustion. I have set up the combustion module and the various new scalars (C8H18,O2,CO2,H2O,N2,RVB), and they all except the latter, which is "transported", are "internal". If I restart the calculation with RVB=0 the combustion can´t take place and the temperature and pressure behaves normally. If I restart the calculation with RVB=1 the temperature and pressure suddenly increase and when the ignition time is reached I get the message

*** WARNING #042 *** PROCESS NOT FULLY CONVERGED -- EQ.,NIT,RESI: SC1 1 0.26948E-02

*** WARNING #043 *** MINIMUM RESIDUAL AT THE END, RETURNING NON-CONVERGED SOLUTION

and the combustion doesn´t start. Does anybody has an idea of the reason of this strange behaviour of P and T? Any help apreciated Best regards Roadracer