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Boundary condition V.n = 0 is applied at the surface to non dimensionlize the governing equations when fluid is being transferred.(a) True(b) FalseI have been asked this question in an interview for job.Query is from Mach Number Independence in section Transonic and Hypersonic Flows of Aerodynamics

Answer»

Right choice is (b) False

The EXPLANATION: When there is no FLUID transfer taking place between the surface, then in order to non dimensionalising the governing EQUATIONS, we use the boundary condition V.n = 0. But, when there is transfer of fluid in or out of the surface then normal velocity vT has to be incorporated thus altering the boundary condition as V.n = vT.



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