National Repository of Grey Literature 10 records found  Search took 0.01 seconds. 
Preliminary results from the interferometric flow fields measurement in the model of the regvibratioulating valve with the vibrating plug
Vlček, Václav
The interferometric method was used for visualization of the flow field in the 2D model of the regulating valve. Plug had two degrees of freedom and measurement was realized when the system lost the stability by flutter. The flow field in the entrance part of the model was evaluated and time variation of some quantities is presented.
Boundary element method for the solution of Helmholtz integral equation
Moses, Pavel
We apply boundary element method for the solution of Helmholtz integral equation, and we compute values of pressure, or its derivatives on the boundary. Solution at an arbitrary point near the barrier can be computed simply by substituting into the formula. Our method is demonstrated on an example of computeation of pressure field near a barrier of the type of unit circle for the case of excitation by a plane wave.
Metoda hraničních prvků pro Helmholtzovy rovnice
Moses, Pavel
The paper shows application of BEM for solution of time-harmonic scattering problems modelled by Helmholtz equation in two dimensions. It deals with computational issues of collocation and Galerkin variants of BEM, such as integration of strongly-singular kernels which arise from boundary integral reformulation of the problem.
Numerické řešení Helmholtzových rovnic metodou hraničních prvků
Moses, Pavel
We study a method of solution of exterior time-harmonic acoustic wave problem described by Helmholtz equations using boudary element technique.
Metoda konečných prvků pro Navierovy-Stokesovy rovnice v některých problémech nestlačitelného proudění
Burda, P. ; Novotný, Jaroslav ; Šístek, Jakub
We deal with 2D flows of incompressible viscous fluid modelled by the Navier-Stokes equations. We focus on reliable modelling of flows in channels or tubes with abrupt changes of the diameter. We present two techniques: one is based on aposteriori error estimates and adaptivity, second makes use of the apriori error estimates and asymptotic behaviour of the solution near the corners.
Vývoj efektivního paralelního BDDC řešiče pro úlohy lineární pružnosti
Šístek, Jakub ; Čertíková, Marta ; Burda, P. ; Neumanová, E. ; Pták, Svatopluk ; Novotný, Jaroslav ; Damašek, Alexandr
Our goal is to develop an efficient implementation of the BDDC method, which could be used fo solution of large problems of today's computational mechanics and structural analysis. A parallel approach is necessary for the usage of powerfull computer resources. We present results of computations of practical problems in 3D elasticty.
Aplikace metody dekompozice domén BDDC na výpočet napětí v konstrukcích
Šístek, Jakub ; Čertíková, Marta ; Novotný, Jaroslav ; Burda, P. ; Damašek, Alexandr
We deal with the Balancing domain decomposition with constraints method (BDDC) applied to 3D elasticity. Theoretical framework is recalled in the first part. The second part describes implementation of the method on parallel computers. Several numerical results of practical problems of structural analysis are presented.
Interferometric flow fields measurement in the model of the regulating valve with the vibrating plug
Vlček, Václav ; Luxa, Martin ; Bula, Vítězslav
The schlieren and interferometric methods were used for visualization of the flow field in the 2D model of the regulating valve. Plug had two degrees of freedom and measurement was realized when the system lost the stability by flutter. Miniature pressure transducer probes were used to obtain information corresponding to the losses and pressure fluctuations in the near field of the vibrating plug.
Formulace úlohy konečné pružnosti pro metodu konečných prvků
Sousedík, Bedřich ; Burda, P.
We formulate basic equations for finite elasticity described by the stored energy function and we derive an algorithm for its solution using the finite element method.
Collocation method for Laplace equation
Moses, Pavel
We present solution of Laplace equation using collocation method and boundary elements.

Interested in being notified about new results for this query?
Subscribe to the RSS feed.