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Note on the use of Camassa-Holm equations for simulation of incompressible fluid turbulence
Caggio, Matteo ; Bodnár, Tomáš
The aim of this short communication is to briefly introduce the Camassa-Holm equations as a working model for simulation of incompressible fluid turbulence. In particular we discuss its application for turbulent boundary layer flows. This model (and related models) is studied for several years in mathematical community, starting from Leray [23]. It can be understood as a generalization of some classical fluid models (Navier-Stokes equations, Prandtl boundary layer equations), showing some interesting mathematical properties in the analysis of the behavior of it's solution (e.g. Layton and Lewandowski [22]). It has been found however, that the model predictions can lead to surprising extensions of the use of the model in technical applications, namely in simulating the turbulent fluid flows. This brief paper should be understood as an introductory note to this novel class of models for applied scientists.
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Numerical simulation of flow over horizontal strip moving in stratified water
Bodnár, Tomáš ; Beneš, L.
The contribution deals with the numerical simulation of the flow over thin horizontal strip placed in the stably stratified fluid flow. Mathematical model is based on the Boussinesq approximation of tne N-S equations. Two different numerical schemes were used for numerical solution. The first one is high order compact finite difference scheme, the secon one is the finite volume AUSM MUSCL scheme.
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Agregace jako antipredační strategie u pulců ropuchy obecné (\kur{Bufo bufo}).
BODNÁR, Tomáš
Larvy (pulci) mnoha druhů žab provozují četné behaviorální adaptace, ab se vyhnuli predátorovi. Snížení vlastní aktivity v přítomnosti predátora je oblíbenou strategií u pulců ropuchy obecné (Bufo bufo). V téti práci byla testována antipredační odpověď pulců druhu Bufo bufo vystavených olfaktorickým podnětům prozrazujícím jak predátorovu přítomnost, tak i blízkost vlastní pulčí agregace. Experiment prokázal, že pulci v blízkosti většího hejna vykazují jinači antipredační odpověď ve míře své aktivity nežli pulci v malé skupince.
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Vokalizační chování rosničky zelené (\kur{Hyla arborea}): Ovlivňuje sociální kontext hlasový projev samců?
BODNÁR, Tomáš
In this study I investigate for two consecutive breeding seasons male calling patterns in natural population of European treefrog (Hyla arborea), a hylid frog with prolonged breeding season and a lek mating system. I tested the hypothesis that males modify their vocal behavior in different ways when faced with stimuli of competitors with various body size. Further here, the influence of water temperature and size of advertising males on their call properties were concerned.
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