A Well Posed Boundary Value Problem in Transonic Gas Dynamics
A Well Posed Boundary Value Problem in Transonic Gas Dynamics
Jose M Sanz
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2) (pu)^ + (pv) = and the irrotationality condition (2. 3) u - V = y X permit us to introduce a stream function 'j^ and a velocity potential ^P . Equations (2. 2) and (2. 3) can then be trans- formed, using the Bernoulli law (2. 1), into second order partial differential equations for (t> or i(j . We have, for instance, the equation (2. 4) (c^-u^)(}) - 2uv(}) + (c^-v^)4) = . ^xx ^xy ^yy The equation (2. 4) is quasilinear. It can be reduced to a linear equation by use of the hodograph transforma...tion. The hodograph transformation consists of introducing u and v as the independent variables. In the hodograph plane we use polar coordinates defined by The equation (2. 4) is transformed into the linear system (2. 5) *e = p ^q ' where M = q/c is the local Mach number. Equations (2. 5) are known in the literature as the Chaplygin equations. They are of the hyperbolic type for supersonic flow, M > 1, and of the elliptic type for subsonic flow, M
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