National Repository of Grey Literature 13 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
Note on the problem of compressible non-Newtonian fluids
Caggio, M. ; Nečasová, Šárka
The aim of the paper is to consider the compressible non-Newtonian fluids of power law type when the viscosity coeffcients depend not only on invariants of velocity field but also on the density. We introduce approximation scheme using model of multipolar fluids. After then passing with higher viscosity to zero we get the measure valued solution of the problem.
Qualitative properties of radiation magnetohydrodynamics.
Kobera, Marek ; Nečasová, Šárka (advisor) ; Franců, Jan (referee) ; Neustupa, Jiří (referee)
We consider a simplified model based on the Navier-Stokes-Fourier system coupled to a transport equation and the Maxwell system, proposed to describe radiative flows in stars. We establish global- in-time existence for the associated initial-boundary value problem in the framework of weak solutions. Next, we study a hydrodynamical model describing the motion of internal stellar layers based on compressible Navier-Stokes-Fourier-Poisson system. We suppose that the medium is electrically charged, we include energy exchanges through radiative transfer and we assume that the system is steadily rotating. We analyze the singular limit of this system when the Mach number, the Alfven number, the Peclet number and the Froude number go to zero in a certain way and prove convergence to a 3D incompressible MHD system with a stationary linear transport equation for transport of radiation intensity. Finally, we show that the energy equation reduces to a steady equation for the temperature corrector.
Note on the problem of dissipative measure-valued solutions to the compressible non-Newtonian system
Al Baba, Hind ; Caggio, Matteo ; Ducomet, B. ; Nečasová, Šárka
We introduce a dissipative measure-valued solution to the compressible non-Newtonian system. We generalized a result given by Novotný, Nečasová [14]. We derive a relative entropy inequality for measure-valued solution as an extension of the classical entropy inequality introduced by Dafermos [2], Mellet-Vasseur [11], Feireisl-Jin-Novotný [5].
Valuation of Exterier Beton, s.r.o.
Nečasová, Šárka ; Jandásek, Radek (referee) ; Zinecker, Marek (advisor)
Goal of this Diploma thesis is determination of the value of Exterier Beton, s.r.o. company on the methods based of discounted cash flow. Theoretical part is focused on primary definitions, definition of value and the reasons why to carry out of valuation. There are also mentioned parts of valuation method and specification process during valuation in diploma thesis. The practical part deals with the characteristics of the company, strategic analysis, evaluation of the financial health of the company, setting up of financial plan and application of selected methods of valuation.
Some notes about the homogenization problem for the Navier-Stokes equations
Feireisl, Eduard ; Namlyeyeva, Yuliya ; Nečasová, Šárka
We study the homogenization problem for the evolutionary Navier-Stokes system under the critical size of obstacles. Convergence towards the limit system of Brinkman's type is shown under very mild assumptions concerning the shape of the obstacles and their mutual distance.
On the problem of singular limits in a model of radiative flow
Ducomet, B. ; Nečasová, Šárka
We consider a "semi-relativistic" model of radiative viscous compressible Navier-Stokes-Fourier system coupled to the radiative transfer equation extending the classical model introduced in [8] and we study diffusion limits in the case of well-prepared initial data and Dirichlet boundary condition for the velocity field.
On the motion of rigid bodies in a compressible viscous fluid under the action of gravitational forces
Ducomet, B. ; Nečasová, Šárka
The global existence of weak solution is proved for the problem of the motion of several rigid bodies in a barotropic compressible fluid, under the influence of gravitational forces.
L.sup.a./sup. přístup k slabému řešení Oseenova proudění podél rotujícího tělesa
Kračmar, S. ; Nečasová, Šárka ; Penel, P.
The aim of this paper is ro described the asymptotic behavior of solution in L.sup. a ./sup. spaces.
L .sup. 2 ./sup. odhady slabého řešení ve váhových Sobolevových prostorech problému Oseenova typu pro rotující těleso
Kračmar, S. ; Nečasová, Šárka ; Penel, P.
The aim of this paper is to described the asymptotic behavior of solution in the weighted spaces with anisotropical weight.
Homogenizace stacionárních Navier-Stokesových rovnic v perforovaných oblastech
Namlyeyeva, Yu. ; Nečasová, Šárka
Homogenization of the steady Navier-Stokes equations in domain with a fine-grain body was studied. The aim of this paper is to construct the average problem, where we have one more term, vc(x)u(x), where c(x) we get from capacity of the holes.

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