|
|
On approximation of an aeroelastic problem in post-critical regimes
Sváček, P. ; Horáček, Jaromír
This paper focused on the mathematical modelling and the numerical approximation of interactions of a simplified problem of the two-dimensional flow and flexibly supported airfoil section with control section. The flow is modelled with the aid of the incompressible Navier-Stokes equations and for the approximation the stabilized finite element method is used. The structure motion is described with the aid of nonlinear ordinary differential equations. The time-dependent computational domain is taken into account by the Arbitrary Lagrangian-Eulerian method.
|
|
| |
|
|
Numerical solution of flow over 2D backward facing step with different inclination angle
Louda, P. ; Sváček, P. ; Kozel, K. ; Příhoda, Jaromír
The finite-volume and finite-element techniques are used for the numerical simulation of the incompressible turbulent flows in a closed channel with a backward-facing step and with an inclined step under the angle 45 degree. A comparison of the finite-volume method based on the averaged Navier-Stokes equations closed by the explicit algebraic Reynolds stress model and the finite-element method using the Navier-Stokes equations with the two-equation k-eps model is presented. Numerical results are compared with experimental data of Makiola (1992).
|
|
|
Interakce tekutiny se strukturou
Feistauer, M. ; Horáček, Jaromír ; Kučera, V. ; Prokopova, J. ; Sváček, Petr
The paper is concerned with two subjects: flow induced airfoil vibrations and flow through channels with moving walls. This problem appears, for example, in the simulation of flow through human vocal folds. Discontinuous Galerkin FEM is promising robust method for the solution of compressible flow and in combination with the ALE method, it allows the solution of flow problems in time dependent domains.
|
|
|
Porovnání numerické simulace tlaku na povrchu třepetajícího se profilu s experimentem v aerodynamickém tunelu
Horáček, Jaromír ; Sváček, Petr ; Vlček, Václav ; Feistauer, M.
The paper compares original experimental results with numerical solution of a 2D aeroelastic problem. The incompressible turbulent flow over a freely vibrating airfoil, with two degrees of freedom for rotation and translation with large vibration amplitudes, is described by the Reynolds averaged Navier Stokes (RANS) equations written in Arbitrary Lagrangian-Eulerian (ALE) form. The Spalart-Allmaras turbulence model is used and the flow is solved by the stabilized FEM. The numerical results are compared with the optical measurements of flow field araund a fluttering doublecircular arc (DCA) 18% profile elastcally supported in a subsonic wind tunnel. The interferometry method was used for airflow visualization in different phases of the profile motion. The numerical resulults for the pressure on the profile surface are in good agreement with the measurement.
|
|
|
Numerické simulace interakce proudu s leteckým profilem se třemi stupni volnosti
Růžička, M. ; Feistauer, M. ; Horáček, Jaromír ; Sváček, Petr
The subject of the paper is the numerical simulation of the interaction of two-dimensional incompressible viscous fluid and a vibrating airfoil with large deviations. The airfoil is considered as a solid body with three degrees of freedom. The airfoil performs rotation around an elastic axis, oscillations in the vertical direction and rotation of a flap. The nemerical simulation is based on the the finite element solution of the Navier-Stokes equations and the system of nonlinear ordinary differential equations deseribing the airfoil motion. The interaction and feedback phenomenon is numerically treated by a coupling procedure, which connects the structural problem and flow problem together. The timedependent computational domain and a moving mesh are taken into account with the aid of the Arbitrary Lagrangian-Eulerian (ALE) formulation. High Reynolds numbers up to 10 require the application of a suitable stabilizatin of the finite element discretization.
|
|
| |
|
|
Vibrace leteckéhoj profilu se třemi stupni volnosti vybuzené proudem vzduchu
Růžička, M. ; Feistauer, M. ; Horáček, Jaromír ; Sváček, Petr
The subject of this article is the numerical simulation of the interaction of two-dimensional incompressible viscous fluid and a vibrating airfoil with large amplitudes. a solid airfoil with three degrees of freedom can rotate around the elastic axis, oscillate in the vertical direction and its flap can rotate. the numerical simulation consists of the finite element solution of the Navier-Stokes equations coupled with a system of nonlinear ordinary differential equations describing the airfoil motion. The time-dependent computational domain and moving grid are taken into account with the aid of the Arbitrary Lagrangian-eulerian (ALE) formulation. High Reynolds numbers up to 10 6 require the application of a suitable stabilization of the finite element discretization. Numerical tests and comparison with NASTRAN solver prove that the developed method is sufficiently accurate and robust.
|
|
|
Interakce proudění v kanále s pohybujícími se tělesy
Růžička, M. ; Feistauer, M. ; Horáček, Jaromír ; Sváček, Petr
The subject of this paper is the numerical simulation of the interaction of two-dimensional incompressible viscous flow through a channel (wind tunnel) and a vibrating airfoil. A solid airfoil with two degrees of freedom, which can rotate around the elastic axis and oscillate in the vertical direction, is considered. The numerical simulation consists of the finite element soulution of the Navier-Stokes equations coupled with the system of ordinary differential equations describing the airfoil motion. We discuss the discretization of the problem and present some computational results.
|
|
|
Nelineární zpětná vazba mezi nestlačitelným prouděním a kmitáním profilu se třemi stupni volnosti
Růžička, M. ; Feistauer, M. ; Sváček, P. ; Horáček, Jaromír
In this article we are concerned with the numerical solution of an aeroelastic problem of two dimensional viscous incompressible flow around an airfoil with three degrees of freedom in a wind tunnel the airfoil is represented by a solid body, which can perform vertical and torsional vibrations and its flap can rotate with respect to the airfoil. Model of the flow is formed by two-dimensional Navier-Stokes equations and the continuity equation. Stabilized finite element method is used for obtaining a numerical solution. Due to the motion of the airfoil the computational domain is time-dependent.
|
guest ::
