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.
Results
Showing 1 to 20 of 45 for “"Coarse mesh"”.
-
A Coarse-Mesh Nodal Method for Multigroup Multidimensional Neutron Diffusion Computations
Made available in DSpace on 2017-07-06T18:55:44Z (GMT). No. of bitstreams: 3 Ougouag_Abderrafi_Mohammed-El-Amine_MS.pdf: 56136085 bytes, checksum: 179625ed39e2fdbc18ddbea719f128f8 (MD5) Ougouag_Abderrafi_Mohammed-El-Amine_MS_ABS.pdf: 634997 bytes, checksum: 89b895aa2f221ef9a70021aabe1778eb (MD5) …
-
A Coarse Mesh Nodal Method for Solving the MultiDimensional Helmholtz Equation
Made available in DSpace on 2017-07-06T18:42:29Z (GMT). No. of bitstreams: 3 Bosnic_Don_P_MS.pdf: 33492823 bytes, checksum: 82a1bfe934175084c06ed6af875ec7cc (MD5) Bosnic_Don_P_MS_ABS.pdf: 496288 bytes, checksum: 0c4e1361066079bfebbfc8f7e75a0808 (MD5) license.txt: 4813 bytes, checksum: …
-
A coarse-mesh nodal diffusion method based on response matrix considerations.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1977
-
A Scalable Parallel Multigrid Solver for Three Dimensional Adaptive Mesh Structural Analysis
… for solution of adaptive structural analysis meshes (ParMASA) is described. The user inputs a coarse mesh. The coarse mesh is successively solved, error estimated, and refined. The refinement simultaneously reduces discretization error and creates a hierarchy of meshes for use by the multigrid …
-
Nodal Methods for Problems in Fluid Mechanics and Neutron Transport (navier-Stokes Equation, Boussinesq, Lid-Driven Cavity, Natural Thermal Convection, Diffusion Synthetic Acceleration)
A new high-accuracy, coarse-mesh, nodal integral approach is developed for the efficient numerical solution of linear partial differential equations. It is shown that various special cases of this general nodal integral approach correspond to several high-efficiency nodal methods developed recently …
-
A Nodal Approach to Arbitrary Geometries, and Adaptive Mesh Refinement for the Nodal Method
… to convection-diffusion problems proves that the coarse mesh efficiency of the nodal method can be maintained by taking advantage of ""off the shelf"" advanced solver technology."
-
Transport and decomposition of allochthonous litter in Icelandic headwater streams: Effects of forest cover
… with the litter bag method, using fine and coarse mesh litter bags to evaluate the effects on microorganism and invertebrate activity in the decomposition processes. The invertebrate fauna found within the coarse bags was also studied. Litter transport into the birch and conifer forest …
-
A computer program for the analysis of linearly elastic plane-stress, plane-strain problems.
… displacement boundary conditions and refined mesh analysis using coarse mesh analysis input displacements, which could not have been done with the original program, are now possible with the modified version presented herein.
-
Modeling, Identification and Simulation of Dynamics of Structures With Joints and Interfaces
… can be captured even with a relatively coarse mesh. Numerical examples demonstrate that the general joint interface element is capable of accounting for the friction and impact damping in joint interfaces, capturing the transformation of vibration energy from low frequency to high due to …
-
Multilevel solution procedures for structural dynamics eigenvalue problems
… Second, the basic multigrid idea of fine mesh relaxation followed by a coarse mesh correction is explicitly applied to the eigenvalue problem to produce an explicit multigrid method. The nested iteration technique is also used to provide information on the coarse meshes and to produce good …
-
The "virtual density" theory of neutronics
… would require construction of exotic hyperfine meshes with continuous re-meshing. Many deterministic transport methods are geometrically flexible but would require tedious, intricate re-meshing or re-tracking to capture distortion effects. Monte Carlo offers the only high-fidelity approach to …
-
Galerkin Projections Between Finite Element Spaces
Adaptive mesh refinement schemes are used to find accurate low-dimensional approximating spaces when solving elliptic PDEs with Galerkin finite element methods. For nonlinear PDEs, solving the nonlinear problem with Newton's method requires an initial guess of the solution on a refined space, which …
-
Validation of Seaplane Impact Load Theory and Structural Analysis of the Martin 270
… the seaplane hull was modeled in Maestro with a coarse mesh finite element model. The pressures from Wagner’s theory and the CFR were applied to the model of the M270 hull. The structural reactions of the drop test section were compared with the reactions determined from Maestro.</p>
-
Local Green's Function Techniques for the Solution of Heat Conduction and Incompressible Fluid Flow Problems
Coarse mesh numerical methods, based on the use of a local Green's function, are developed and applied to the numerical solution of heat conduction and incompressible fluid flow problems. In the solution of heat conduction problems, a local Green's function is used to develop a local integral …
-
Towards first-principles electrochemistry
… over space, allowing for its determination on a coarse mesh using optimized electrostatic solvers. Because this scheme takes into account exact open boundary conditions, its performance is considerably superior to that of conventional corrective methods. Extending this computational scheme, we …
-
Optimisation and efficiency improvement of pelton hydro turbine using computational fluid dynamics and experimental testing
… it was decided to use two types of mesh sizing. Fine mesh simulation was mesh independent but the required time to solve was still unfeasible for parametric optimisation. Therefore, this fine mesh sizing was used only at the key points to verify the design changes. Coarse mesh …
-
Progressive failure analysis of laminated composite structures
… an element or ply, and reduces finite element mesh sensitivity since localized damage can develop even in a relatively coarse mesh. An experimental program was conducted to validate the progressive failure analysis. Six foot diameter graphite/epoxy frames—representative of ring stiffeners for …
-
Comparison of Bare Root vs. Potted Plants, Species Selection, and Caging Types for Restoration of a Prairie Wetland, and Quantitative Analysis and Descriptive Survey of Plant Communities and Associations at Lewisville Lake Environmental Learning Area (LLELA), Lewisville, TX
… systems and bare-root transplants. Two different mesh sizes were used for protection, and the success of the different caging was evaluated. Of eight species, only four survived through the second growing season. There was no significant difference in the success of the propagule types for …
-
Critical speeds and unbalance response of cantilever-sleeve rotors using finite elements with efficient higher order basis functions
… More accurate results are obtained using a coarse mesh that has increased number of degrees of freedom. Further no errors are introduced-during post processing for stresses, strains, etc.
-
Modeling Feedback Effects of Transient Nuclear Systems Using Monte Carlo
… and provided by a low-order Time Dependent Coarse Mesh Finite Difference diffusion solver. While this scheme has been previously applied to prescribed transients, thermal feedback is now incorporated to provide a fully self-propagating Monte Carlo transient multiphysics solver which can be …
Page 1 of 3