Thank you very much for the reply,

Yes you are correct i have started this simulation at 100k  th iteration. In this simulation i have validate this against a exp data (isentropic mach number VS chord, attached picture) so honestly i am using cD and cL values to check the convergence. I need to have a reasonable steady condtition in LES to get the data to validate against experiment data.

Isentropic mach number VS chord