Segregated converges, but coupled diverges... why? -- CFD Online Discussion Forums

December 22, 2015, 09:12	Segregated converges, but coupled diverges... why?	#1
cfdblender New Member Join Date: Jun 2015 Location: Great Britain Posts: 16 Rep Power: 10	Running an ground vehicle aerodynamic simulation and everything was fine until changed from SEGREGATED flow and energy to COUPLED flow and energy - then every simulation diverged, no matter what I tried (mesh improvements, different turbulence models, etc) ... until I switched back to segregated and it works again. But why? Could it be the Mach number? (my simulation runs at M=0.175) (I tried coupled flow & energy because I wanted to try a freestream boundary condition on the roof and walls of the domain to simulate an open windtunnel, but the freestream option is unavailable for segreated flow in STAR-CCM+)

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