@rak64
1. I believe it is premature, to say the least, for a discussion of the accident to CL604 C-FTBZ "5991" to be conducted in this thread. So far the only similaroty we have between the two events is that they were flight test aircraft on takeoff, and resulted in the unfortunate loss of all aboard.
2. I wouldn't trust CFD methodology to capture the stall characteristics of a real wing; if that's what you want then validated table-lookup is far better, but that requires someone go get the data for the validation ... ultimately, the beast has to be flight tested, with the risks that brings.