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Aerospace Engineering
2D vs 3D Method of Characteristics for Rocket Nozzle Design
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[QUOTE="boneh3ad, post: 6398405, member: 268837"] When discussing the method of characteristics as it pertains to nozzle design (and in aerodynamics more generally), 2D typically refers to "2D planar" and the cases with azimuthal symmetry are specifically termed "axisymmetric" to avoid conflation of the two. The distinction is important since the equations are different and they do not produce the same answer despite the fact that an axisymmetric set of equations are technically still two-dimensional. RAMP is still used (not sure about BLIMP), but is not something that is available through the NASA software service (a lot of aero codes are if you are a US Citizen with a legitimate purpose). I did find [URL='https://ntrs.nasa.gov/citations/19850007493']the program manual for RAMP2[/URL], however, which indicates pretty clearly that it has a logical switch to toggle between 2D and axisymmetric cases within the code. So yes, RAMP can handle both, but it solves a slightly different set of equations depending on whether the flow is 2D planar or axisymmetric. They are definitely still in use, though I am sure have undergone substantial changes over the years. How much longer that will be the case, who knows. They're probably written in FORTRAN77 (or earlier) and there are increasingly few people who know how to write or maintain FORTRAN code. [/QUOTE]
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2D vs 3D Method of Characteristics for Rocket Nozzle Design
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