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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Boundary conditions for stratified flows
 Řezníček, Hynek ; Beneš, Luděk (advisor) ; Brechler, Josef (referee)
In this thesis is presented mathematical model of stratified 2D flow of viscous incopressible fluid and its program realization. Basic equations of fluid flow in Boussinesq approximation were solved by finite volume method on structured nonortogonal grid. Discretization was done by the principle of semi-discretisation. The space derivative was solved by AUSM me- thod with MUSCL velocity reconstruction. The viscid terms were solved through auxiliary grids. During time discretization artificial compressibility method was used in dual time. The resulting system of ODEs is integrated in time by a suitable Runge-Kutta multistage scheme. Numerical experiments were calculated for flow with Reynolds number equals 1000. Further 3 numerical experiments are presented with different boundary conditions. 1
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Implementation of Coupled Pressure and Temperature Correction Algorithm into Openfoam
 Kožíšek, Martin ; Fürst, J.
This paper shows results of the project concerned with implementation of the coupled pressure and temperature correction algorithm with AUSM interpolations into OpenFOAM. This algorithm treats acoustic terms implicitly following the approach proposed by Dick and Nerinckx. Numerical results for compressible flow test cases confirm that our implementation is well suited for calculations of transonic flows.
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Implementation of pressure-correction algorithm with AUSM into openFOAM
 Kožíšek, Martin ; Fürst, J.
This paper shows results of the project concerned with implementation of the Advection Upstream Splitting Method (AUSM) into OpenFOAM. AUSM is well suited for calculations of transonic flows. Authors have recently presented the implementation of explicit AUSM method. In this article the authors aim to improve convergence behaviour. This was achieved by treating acoustic terms implicitly following the approach proposed by Dick and Nerinckx. The system of equations became semi-implicit and the fully segregated pressure-correction algorithm was implemented. Presented numerical solutions of 2D and 3D inviscid transonic flows through a channel were obtained using explicit as well as new implicit implementation of AUSM in OpenFOAM.
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