First of all, your teamate Daniele De Grazia has helped me before, in order to improve the session file. However, the simulation continues being not able to converge. Some data of the session file:

-I am studying the problem through the Euler equations.
-As boundary conditions, I use far field at the inlet, upper, lower and outlet regions.
-I use a non collocated base with a number of points which are the double of the number of modes.

Finally, I attach the session file and the last .chk before the simulation blows up,so you can understand better the problem and the conditions that I am using.

Kind Regard,