Regarding Unsteady Simulations for Non-Ideal gases using SU2-COOL

[RNSaxena]

I am trying to simulate unsteady non-ideal gas flow over a cylinder using Coolprop (SU2-COOL). First I ran cases for ideal-gas (STANDARD_AIR), compressible air flow over a cylinder which converged well and gave correct Strouhal number. I have used MARKER_FAR Boundary condition for this, but when I changed the GAS_MODEL to COOLPROP, it was showing only Riemann BC and Giles BC are allowed for non-ideal gases.
Now, I am first trying to validate that the Riemann Boundary Condition works for ideal gas, but it is not converging (all other conditions are same, just INIT_OPTION is changed to TD_CONDITIONS from REYNOLDS and BC is changed from MARKER_FAR to MARKER_RIEMANN(Inlet, TOTAL_CONDITIONS_PT, ... ,..., Outlet, STATIC_PRESSURE, ......., TOP_AND_BOTTOM_BOUNDARY, TOTAL_CONDITIONS_PT, ....).

Please let me know if there is any error in this implementation. Is there anything else can I do to first make it converge?
Also, any suggestion for unsteady non-ideal gas flow over a cylinder using SU2-COOL Framework would be highly appreciated.
Thank you.