Hi Amine,

      Firstly, thank you for the reply. I really appreciate it especially as I have gotten no where. 

The .out files do not have any error and the mechanism complies fine. I tried to run the simulation without species transport and it works fine. I also tried installing R19.1 and that showed the same issue. I tried turning off all internet connections and again it failed. I am running blind right now but willing to try any suggestions. This is a mechanism I have used on another computer and it worked fine.  As I mentioned in the other post, the error log file just says abnormal exit at various nodes. I looked at the Windows application log as well and it did not indicate anything. Only Fluent crashes but Workbench is still open.  

Here is a screenshot of the initial settings.



As I said, Any help will be appreciated.