Different boundary conditions for LES solver Palm 6.0 used for ABL in tunnel experiment

summary:We tried to reproduce results measured in the wind tunnel experiment with a CFD simulation provided by numerical model PALM. A realistic buildings layout from the Prague-Dejvice quarter has been chosen as a testing domain because solid validation campaign for PALM simulation of Atmospheric Boundary Layer (ABL) over this quarter was documented in the past. The question of input data needed for such simulation and capability of the model to capture correctly the inlet profile and its turbulence structure provided by the wind-tunnel is discussed in the study. The PALM dynamical core contains a solver for the Navier-Stokes equations. By default, the model uses the Large Eddy Simulation (LES) approach in which the bulk of the turbulent motions is explicitly resolved. It is well validated tool for simulations of the complex air-flow within the real urban canopy and also within its reduced scale provided by wind tunnel experiments. However the computed flow field between the testing buildings did not correspond well to the measured wind velocity in some points. Different setting of the inlet boundary condition was tested but none of them gave completely developed turbulent flow generated by vortex generators and castellated barrier wall place at the entrance of the aerodynamic section of the wind tunnel

Mathematical modeling and numerical solution of 3D atmospheric boundary layer

A mathematical and numerical investigation of the flow over 2D and 3D hilly terrain in the ABL is presented including comparison with experiment. The artifical compressibility method with conjuction of finite volume method and explicit Runge-Kutta multage scheme is used for numerical analysis

Adolescent needs of low-theshold club Oráč

The thesis deals with low-threshold youth work in the context of salesian pedagogy. Using secondary analysis examines the needs of adolescents recorded in official documents of low-threshold club Oráč. Needs are classified into the system of needs and research results are used to a comprehensive view of the declared needs of adolescents visiting low-threshold club of Salesian center in České Budějovice in 2012

Reality and Virtuality of Game in Postmodernism

The thesis focuses on virtuality and reality of game in history of human culture and on its recent pozition.The first chapter adresses reality and virtuality of game in traditional view definitions. The second chapter describes the evolution of culture in game since human origin to postmodernism and the evolution of game in art. The third chapter takes on the evolution and conditions of postmodern culture, and also game in postmodern art. Further it describes virtuality and reality of game and society nowadays. The fourth chapter again compares recent author's definitions of game and closes the thesis with resulting definition of virtuality and reality of postmodern game

Numerical Models for Atmospheric Boundary Layers Flow

The work presents a short overview of the work that has been done by our group at the field of mathematical modelling of the Atmospheric Boundary Layer

Estimate of vegetation efficiency on reducing dust concentration produced by a surface coal mine

summary:A new vegetative barrier can help to reduce dust concentration in a surface coal mine neighbourhood. The project reports about quantification of this effect. An air flow field is computed together with the dust transport driven by it using an in-house CFD solver. The 2D cuts of a real geometry of B\'{i}lina coal mine in north Bohemia are used. The vegetation is modelled as horizontally homogeneous porous medium which slows the air flow inside. An influence on turbulence and filtering the dust particles by the deposition on the leaves is considered inside the barrier too. For the efficiency estimation of the barrier several integral and point criteria are used