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 13 of 13 for “"curved boundaries"”.
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Finite element techniques for curved boundaries,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1973.
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A Thermal and Mechanical Model of Laser Cladding
… with meshes matching the process geometry (curved boundaries) and; (3) perform the stress analysis with more regular meshes (with overall planar boundaries) that are more likely to lead to convergence.
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On the uncertainty quantification and non-linear hyper elastic simulation of biological tissues
… generation of higher-order grids near curved boundaries, etc.). In these regards, linear elasticity is commonly used for adaptation by viewing the mesh as a solid. In some cases, such as for anisotropic meshes or for extremely large boundary movement, this approach to mesh movement has …
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Gluing and Creasing Paper along Curves: Computational Methods for Analysis and Design
Curved geometries that can be obtained from flat sheets of material have many potential applications in design and engineering. In this thesis, we consider shapes achievable by joining planar patches of material along their curved boundaries, focusing specifically on curved-crease origami as a …
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A multidomain spectral method for computational aeroacoustics
… grids of non-overlapping hexahedra that may have curved boundaries. An isoparametric mapping is used to transform each hexahedron on the master element, on which an efficient collocation spectral approximation can be defined by the use of tensor products. Continuity of the solution in space is …
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A study of a moving contact algorithm
… studies two conclusions were reached: for curved boundaries use curved elements and avoid the use of irregularly shaped elements. Finally, the improved solution algorithm is applied fo sheet pile interlocks loaded in axial tension. Results for progressively increasing load show the spread …
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An improved volumetric LBM boundary approach and its extension for sliding mesh simulation
… grid for accurate boundary representation. For curved boundary that is commonly encountered with complex geometry, available point-wise based LBM extrapolation/interpolation boundary schemes can not guarantee the exact hydrodynamic flux conditions. To address this fundamental issue, a volumetric …
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Deep Learning and Optimised Nanoplasmonic Sensors for Label-free Biomedical Applications
… methods use spatial isomorphism to deal with curved boundaries and introduce an unconditionally stable first-order geometrically accurate meshing scheme for the finite difference time domain (FDTD) method. 2. Fabrication of optimized plasmonic nanostructures: Mentioned numerical methods are …
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On gravity-driven flow
… In the first problem we analyse the effect of curved boundaries on the evolution of finite-release low-Reynolds-number exchange flow. From the equations of motion in an annular geometry we derive the governing nonlinear PDE for the evolution of the density interface. Systematically varying the …
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Capillary forces and wetting dynamics by diffuse-interface modeling
… numerical challenges associated with moving curved boundaries, and the tracking of the interface. Numerical results are compared with theoretical predictions at equilibrium, and the capillary forces obtained in non-equilibrium situations are examined.</p> <p>The interparticle forces due to …
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The Diffuse Bounce Back Lattice Boltzmann Method and its Applications on the Study of Fluid-Particle Interactions
… boundary treatments are studied to recover curved and moving boundaries on structured orthogonal grids for the lattice Boltzmann method. These methods can describe curved boundaries more accurately and more smoothly than the naive staircase approximation. However, to improve the order of …
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Methodologies for electromagnetic field modeling for computer aided analysis of multi-domain physical interactions
… wave propagation in geometries involving curved and moving boundaries. This methodology provides for the definition of an equivalent electromagnetic boundary value problem over a domain with fixed boundaries. A modified time-dependent operator is derived for the Lagrangian formulation, …