Global ETD Search

1	High-Performancs Sparse Matrix-Vector Multiplication on GPUS for Structured Grid Computations Godwin, Jeswin Samuel 22 May 2013 (has links) No description available. Computer Engineering Computer Science "SPMV GPU Structured Grid Column-Diagonal"
2	SIMULATION OF FLOW THROUGH LOW-PRESSURE LINEAR TURBINE CASCADE, USING MULTI-BLOCK STRUCTURED GRID MUTNURI, PAVAN KUMAR January 2003 (has links) No description available. Engineering, Mechanical low-pressure turbine multi-block structured grid higher-order schemes flow separation
3	Parallel, Navier Gecgel, Murat 01 December 2003 (has links) (PDF) The aim of this study is to extend a parallel Fortran90 code to compute three&ndash / dimensional laminar and turbulent flowfields over rotary wing configurations. The code employs finite volume discretization and the compact, four step Runge-Kutta type time integration technique to solve unsteady, thin&ndash / layer Navier&ndash / Stokes equations. Zero&ndash / order Baldwin&ndash / Lomax turbulence model is utilized to model the turbulence for the computation of turbulent flowfields. A fine, viscous, H type structured grid is employed in the computations. To reduce the computational time and memory requirements parallel processing with distributed memory is used. The data communication among the processors is executed by using the MPI ( Message Passing Interface ) communication libraries. Laminar and turbulent solutions around a two bladed UH &ndash / 1 helicopter rotor and turbulent solution around a flat plate is obtained. For the rotary wing configurations, nonlifting and lifting rotor cases are handled seperately for subsonic and transonic blade tip speeds. The results are, generally, in good agreement with the experimental data. QA Numerical Analysis 297-299.4 Rotary wing, thin&ndash layer Navier&ndash vortex interactions, flat plate
4	Development of High-order CENO Finite-volume Schemes with Block-based Adaptive Mesh Refinement (AMR) Ivan, Lucian 31 August 2011 (has links) A high-order central essentially non-oscillatory (CENO) finite-volume scheme in combination with a block-based adaptive mesh refinement (AMR) algorithm is proposed for solution of hyperbolic and elliptic systems of conservation laws on body- fitted multi-block mesh. The spatial discretization of the hyperbolic (inviscid) terms is based on a hybrid solution reconstruction procedure that combines an unlimited high-order k-exact least-squares reconstruction technique following from a fixed central stencil with a monotonicity preserving limited piecewise linear reconstruction algorithm. The limited reconstruction is applied to computational cells with under-resolved solution content and the unlimited k-exact reconstruction procedure is used for cells in which the solution is fully resolved. Switching in the hybrid procedure is determined by a solution smoothness indicator. The hybrid approach avoids the complexity associated with other ENO schemes that require reconstruction on multiple stencils and therefore, would seem very well suited for extension to unstructured meshes. The high-order elliptic (viscous) fluxes are computed based on a k-order accurate average gradient derived from a (k+1)-order accurate reconstruction. A novel h-refinement criterion based on the solution smoothness indicator is used to direct the steady and unsteady refinement of the AMR mesh. The predictive capabilities of the proposed high-order AMR scheme are demonstrated for the Euler and Navier-Stokes equations governing two-dimensional compressible gaseous flows as well as for advection-diffusion problems characterized by the full range of Peclet numbers, Pe. The ability of the scheme to accurately represent solutions with smooth extrema and yet robustly handle under-resolved and/or non-smooth solution content (i.e., shocks and other discontinuities) is shown for a range of problems. Moreover, the ability to perform mesh refinement in regions of smooth but under-resolved and/or non-smooth solution content to achieve the desired resolution is also demonstrated. computational fluid dynamics finite-volume method high-order scheme adaptive mesh refinement (AMR) ENO scheme essentially non-oscillatory CENO body-fitted multi-block mesh high-order spatial discretization numerical method hyperbolic and elliptic PDE fixed stencil reconstruction piecewise linear reconstruction smoothness indicator Euler and Navier-Stokes equations advection-diffusion equation smooth and non-smooth solution content k-exact least-squares reconstruction hybrid numerical scheme compressible gaseous flows refinement criteria high-performance parallel computing solution monotonicity enforcement large-eddy simulation (LES) interpolation technique structured grid inviscid and viscous flow TVD scheme h-p-adaptation high-order boundary conditions complex curved geometries 0538
5	Development of High-order CENO Finite-volume Schemes with Block-based Adaptive Mesh Refinement (AMR) Ivan, Lucian 31 August 2011 (has links) A high-order central essentially non-oscillatory (CENO) finite-volume scheme in combination with a block-based adaptive mesh refinement (AMR) algorithm is proposed for solution of hyperbolic and elliptic systems of conservation laws on body- fitted multi-block mesh. The spatial discretization of the hyperbolic (inviscid) terms is based on a hybrid solution reconstruction procedure that combines an unlimited high-order k-exact least-squares reconstruction technique following from a fixed central stencil with a monotonicity preserving limited piecewise linear reconstruction algorithm. The limited reconstruction is applied to computational cells with under-resolved solution content and the unlimited k-exact reconstruction procedure is used for cells in which the solution is fully resolved. Switching in the hybrid procedure is determined by a solution smoothness indicator. The hybrid approach avoids the complexity associated with other ENO schemes that require reconstruction on multiple stencils and therefore, would seem very well suited for extension to unstructured meshes. The high-order elliptic (viscous) fluxes are computed based on a k-order accurate average gradient derived from a (k+1)-order accurate reconstruction. A novel h-refinement criterion based on the solution smoothness indicator is used to direct the steady and unsteady refinement of the AMR mesh. The predictive capabilities of the proposed high-order AMR scheme are demonstrated for the Euler and Navier-Stokes equations governing two-dimensional compressible gaseous flows as well as for advection-diffusion problems characterized by the full range of Peclet numbers, Pe. The ability of the scheme to accurately represent solutions with smooth extrema and yet robustly handle under-resolved and/or non-smooth solution content (i.e., shocks and other discontinuities) is shown for a range of problems. Moreover, the ability to perform mesh refinement in regions of smooth but under-resolved and/or non-smooth solution content to achieve the desired resolution is also demonstrated. computational fluid dynamics finite-volume method high-order scheme adaptive mesh refinement (AMR) ENO scheme essentially non-oscillatory CENO body-fitted multi-block mesh high-order spatial discretization numerical method hyperbolic and elliptic PDE fixed stencil reconstruction piecewise linear reconstruction smoothness indicator Euler and Navier-Stokes equations advection-diffusion equation smooth and non-smooth solution content k-exact least-squares reconstruction hybrid numerical scheme compressible gaseous flows refinement criteria high-performance parallel computing solution monotonicity enforcement large-eddy simulation (LES) interpolation technique structured grid inviscid and viscous flow TVD scheme h-p-adaptation high-order boundary conditions complex curved geometries 0538

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