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Numerické řešení vybraných problémů vnější a vnitřní aerodynamiky
Furmánek, P. ; Fürst, J. ; Horáček, Jaromír ; Kozel, Karel
The work deals with numerical solution of transonic flows around a DCA 18% profile and over a wing (modified NACA 0012) in the wall. The numerical solution is based on MacCormack finite volumes prdictor-corrector scheme with Jameson's artifficial dissipation. We present several results of subsonic and transonic flow over DCA 18% in the channel compared to the experimental results of Institute of Thermomechanics. Next simulation considers 3D transonic flow over a wing with two different angles of attack.
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Numerické řešení nestacionárního proudění stlačitelné viskozní tekutiny v kanále
Punčochářová, Petra ; Kozel, Karel ; Fürst, J. ; Horáček, Jaromír
This work deals with numerical solutin of viscous laminar flows in a channel with time-changing wall. MacCormack scheme and Jameson artificial viscosity are used for numerical solution in the form of finite volume method with grid of quadrilateral cells. Mathematical model is unsteady system of 2D laminar Navier-Stokes equations. Unsteady behavior is caused by time dependent-boundary of lower. The channel represents a simple case of vocal tract. an unsteady domain is presented using Arbitrary Lagrangian-Eulerian method. In the work several numerical results of flows in two different channels are presented.
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Matematické modely hydraulických systémů, příklady, analýza
Straškraba, Ivan
The purpose of this contribution is to describe some phenomena arising in hydraulic systems. By a hydraulic system we call a network of tubes, pumps, valves, accumulators and other elements designed to fulfil certain function, for example pumping water from one tank to another. To quantify the fluid flow through the system in question we use fundamental physical principles, namely conservation of mass, momentum and energy. In pipes it leads to Navier-Stokes equations simplified with regard to the special properties of the flow. For description of the fluid flow through other hydraulic elements different models are used which must be identified by the help of experiments performed on an appropriately designed test ring.
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