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FLUENT Ideal Gas Error

FLUENT Ideal Gas Error

FLUENT Ideal Gas Error

(OP)
I have developed a model using Gambit 2.0 and have created a very fine mesh.  The problem is cold flow (non-reacting) with 2 species entering via two separate inlets into an expansion.  The problem ran well with the incompressible gas, however it does not work when I convert to ideal gas.
I have honestly tried adjusting everything (including multigrid settings) but upon the very first iteration, the solution diverges and says;

"Error on line 743 in amgif.c"

Any input would be appreciated.
Cheers
Jouch

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