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Choice of the SUPG parameter for higher order finite elements
Kohutka, Jiří ; Knobloch, Petr (advisor) ; Dolejší, Vít (referee)
In this work, we deal with the finite element method Streamline Upwind/Petrov-Galerkin (SUPG) and use it to solve boundary value problem for the stationary convection-diffusion equation with dominant convection with Dirichlet boundary condition on the whole boundary of bounded polyhedral computational domain of dimension 1 and 2, respectively. We consider a quadratic Lagrangian finite elements on the line segments and triangles, respectively. The core of the work is a proposition of choice of stabilizing parameter of SUPG method as an elementwise affine function in outflow boundary layer and as an elementwise constant function in the rest of the computational domain. We show that this choice gives a more accurate solution than the choice of the stabilization parameter as a constant in each element. 1
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Implementation of the FEM-FCT method for nonstationary convection-diffusion equations
Stará, Lenka ; Knobloch, Petr (advisor) ; Dolejší, Vít (referee)
The aim of this work is the implementation and the testing of the fi- nite element method flux corrected transport (FEM-FCT) for an evolutionary convection-diffusion-reaction equation with small diffusion parameter. The basic idea of this method lies in modification of algebraic equation which is obtained from the Galerkin finite element method in order to suppress spurious oscillations and not to smear the solution considerably. In the first section of this work we in- troduce the problem of solving a convection-diffusion-reaction equation. The next section is devoted to a short introduction of the finite element method and we pro- vide the Galerkin finite element formulation of the convection-diffusion-reaction problem. Afterward we derive formulae, which are necessary for implementation FEM-FCT method. In the last section we present numerical results, which are studied at body rotation problem. 1
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Implementation of the FEM-FCT method for nonstationary convection-diffusion equations
Stará, Lenka ; Knobloch, Petr (advisor) ; Dolejší, Vít (referee)
The aim of this work is the implementation and the testing of the fi- nite element method flux corrected transport (FEM-FCT) for an evolutionary convection-diffusion-reaction equation with small diffusion parameter. The basic idea of this method lies in modification of algebraic equation which is obtained from the Galerkin finite element method in order to suppress spurious oscillations and not to smear the solution considerably. In the first section of this work we in- troduce the problem of solving a convection-diffusion-reaction equation. The next section is devoted to a short introduction of the finite element method and we pro- vide the Galerkin finite element formulation of the convection-diffusion-reaction problem. Afterward we derive formulae, which are necessary for implementation FEM-FCT method. In the last section we present numerical results, which are studied at body rotation problem. 1
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Choice of the SUPG parameter for higher order finite elements
Kohutka, Jiří ; Knobloch, Petr (advisor) ; Dolejší, Vít (referee)
In this work, we deal with the finite element method Streamline Upwind/Petrov-Galerkin (SUPG) and use it to solve boundary value problem for the stationary convection-diffusion equation with dominant convection with Dirichlet boundary condition on the whole boundary of bounded polyhedral computational domain of dimension 1 and 2, respectively. We consider a quadratic Lagrangian finite elements on the line segments and triangles, respectively. The core of the work is a proposition of choice of stabilizing parameter of SUPG method as an elementwise affine function in outflow boundary layer and as an elementwise constant function in the rest of the computational domain. We show that this choice gives a more accurate solution than the choice of the stabilization parameter as a constant in each element. 1
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