Topics: unsteady one-dimensional subsonic and supersonic flows, acoustics, sound propagation, supersonic flows with shocks and Prandtl-Meyer expansions, flow around slender bodies, shock tubes, reaction fronts (deflagration and detonation). Mathematical tools: method of characteristics and selected numerical methods.
Illustration of compressible flow phenomena and introduction to the corresponding mathematical description methods.
The interaction of compressibility and inertia is responsible for wave generation in a fluid. The compressibility plays an important role for example in unsteady phenomena, such as oscillations in gas pipelines or exhaust pipes. Compressibility effects are also important in steady subsonic flows with high Mach numbers (M>0.3) and in supersonic flows (e.g. aeronautics, turbomachinery). The first part of the lecture deals with wave propagation phenomena in one-dimensional subsonic and supersonic flows. The discussion includes waves with small amplitudes in an acoustic approximation and waves with large amplitudes with possible shock formation. The second part deals with plane, steady supersonic flows. Slender bodies in a parallel flow are considered as small perturbations of the flow and can be treated by means of acoustic methods. The description of the two-dimensional supersonic flow around bodies with arbitrary shapes includes oblique shocks and Prandtl-Meyer expansions etc.. Various boundary conditions, which are imposed for example by walls or free-jet boundaries, and interactions, reflections etc. are taken into account.
a list of recommended textbooks is handed out at the beginning of the lecture.
Prerequisites / Notice
prerequisites: Fluiddynamics I and II
Performance assessment information (valid until the course unit is held again)
The performance assessment is only offered in the session after the course unit. Repetition only possible after re-enrolling.
Mode of examination
written 90 minutes
Additional information on mode of examination
The successful attendance of at least one out of two written examinations (Klausurübungen, midterm and at the end of the semester, no grade, only pass/fail) in addition to the session examination is part of the requirements to obtain a final grade. In case a student does not pass at least one out of the two written examinations (Klausurübungen, midterm and at the end of the semester), she/he must deregister from the session examination to avoid being classified as "no show". The final grade does depend only on the performance in the session examination.
Zusammenfassung von 6 Seiten /Summary of 6 pages Standart wissenschaftlicher Taschenrechner, pocket calculator(standard
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