Hello i tried all the suggestions you had mentioned. I set the courant number to 2.75 for about 1000 iterations and then changed it back to 5. I selected higher order term relaxations, disabled compressibility effects in k-w sst, reduced urfs, used green gauss node based gradient. The walls are adiabatic so heat flow was 0. But I'm still no where near convergence. I also used outlet pressure as a monitor . Pls help, thanks. 
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