CFD Analysis of Rocket In ANSYS

A: A points at the numerical artifact the backflow model exists to limit. C is the solver-level failure it’s explicitly guarding. D is also covered since backflow species get imposed. B lives inside the nozzle physics; the outlet safeguard never sees it.

A: A follows straight from the turbulence model; eddy viscosity scales with intensity. B violates continuity since mass flow is fixed by BCs. C flips the sign; turbulence raises losses. D needs vapor pressure physics that aren’t implied here.

A: A is a rule-of-thumb myth; angle size isn’t fixed. B mixes up two different symmetry approaches. C is the real clash: axisymmetric kills swirl, while a sector implies theta-variation. D overreaches; reduced models work if physics allow.

A: A matters for steels, not copper alloys at these conditions. B is driven by extreme thermal gradients every firing and governs life. C applies to high-strength steels, not CuCrZr. D needs sulfur chemistry that isn’t present.