Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Local Time-Stepping"”.
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Development of an efficient 3-D CFD software to simulate and visualize the scavenging of a two-stroke engine
… to efficiently simulate the three-dimensional, time-dependent, Navier-Stokes equations within the complex, real-world geometry of the two-stroke engine with moving piston and rotating crankshaft. Due to the high temperature in the cylinder after combustion, a temperature dependent treatment of …
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Dynamic mesh adaption for supersonic combustion waves modeled with detailed reaction mechanisms
… as implicit upwind finite volume scheme, <br>time scale splitting, adaptive local time stepping, and source term <br>integration methods, to solve stiff systems of ODEs. <br>Thus we obtain the possibility to simulate on a workstation with <br>moderate numerical cost demanding, time-dependent …
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Aerodynamic inverse design of transonic turbomachinery cascades
… meshes. A five-stage Runge-Kutta pseudo-time integration scheme is used to march the solution to steady state. Non-linear artificial viscosity is added to eliminate pressure-velocity decoupling and to capture shocks. Convergence is accelerated using local time stepping and implicit …
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Immersed Discontinuous Galerkin Methods for Acoustic Wave Propagation in Inhomogeneous Media
… problems with high jumps across the interface. Local time-stepping and parallel algorithms are used to speed up computation. Several realistic interface problems such as ether/glycerol, water/methyl-alcohol and water/air with a circular interface are solved to show the stability and robustness …
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Three-dimensional upward scheme for solving the Euler equations on unstructured tetrahedral grids
… more efficiently to attain computational times per cell comparable to those of structured codes. The underlying philosophy employed in constructing the basic flow solver is to draw on proven structured-grid technology whenever possible in order to reduce risk. Thus, spatial discretization …
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Numerical Methods for Compressible Multi-phase flows with Surface Tension
… finite volume scheme on the unstructured grid, time-accurate local time stepping (LTS) is applied to compute the solutions of the governing PDE system, in which the results are also compared with time-accurate global time stepping. Second, we propose a novel high order accurate numerical method …
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Discontinuous Galerkin methods for compressible and incompressible flows on space-time adaptive meshes
… Galerkin (DG) framework along space-time adaptive meshes. Two main research fields can be distinguished: (1) fully explicit DG methods on collocated grids and (2) semi-implicit DG methods on edge-based staggered grids. DG methods became increasingly popular in the last twenty years …
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Computational modeling and simulation of nonlinear electromagnetic and multiphysics problems
… three-dimensional full-wave methods in the time domain. The problems under consideration fall into two categories. One is nonlinear electromagnetic problems with the nonlinearity embedded in either the permeability or the conductivity of the material's constitutive properties. The other is …