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 9 of 9 for “"Spectral element method (SEM)"”.
-
Spectral Integral Method and Spectral Element Method Domain Decomposition Method for Electromagnetic Field Analysis
<p>In this work, we proposed a spectral integral method (SIM)-spectral element method (SEM)- finite element method (FEM) domain decomposition method (DDM) for solving inhomogeneous multi-scale problems. The proposed SIM-SEM-FEM domain decomposition algorithm can efficiently handle problems with …
-
Wavefront Healing and Tomographic Resolution of Mantle Plumes
… speed imaged in the lowermost mantle, we use a Spectral Element Method (SEM) to simulate global seismic wave propagation in 3-D wavespeed models and measure frequency-dependent P-, S-, Pdiff- and Sdiff-wave traveltime anomalies caused by plume structures in the lowermost mantle. We compare SEM …
-
Highly scalable solution of incompressible Navier-Stokes equations using the spectral element method with overlapping grids
… is based on a variant of the Schwarz alternating method in which the solution is advanced in parallel in separate overlapping subdomains. In each domain, the governing equations are discretized with an efficient high-order spectral element method (SEM). At each step, subdomain boundary data are …
-
Imaging Resolution of the 410-km and 660-km Discontinuities
… based on wave propagation simulations using a Spectral Element Method (SEM). We investigate finite-frequency effects of direct P waves as well as P-to-S converted waves by varying the length scale of discontinuity topography in the transition zone. We show that wavefront healing effects are …
-
High-Resolution Digital Noise Mapping of Urban Environments Using the Spectral Element Method
… in urban areas. This research employs the spectral element method (SEM), a numerical technique known for its ability to model complex geometries accurately. The SEM is employed to create high-resolution digital soundscape maps that allow for a comprehensive analysis of the spatial and …
-
Investigation of the dynamic behavior of a cable-harnessed structure
… of a cable-harnessed structure by means of the Spectral Element Method (SEM). A double beam model is used to emulate a cable-harnessed structure. SEM modeling can define the location and the number of connections between the two beams in a convenient fashion. The proposed modeling is applied and …
-
A Hybrid Spectral-Element / Finite-Element Time-Domain Method for Multiscale Electromagnetic Simulations
<p>In this study we propose a fast hybrid spectral-element time-domain (SETD) / finite-element time-domain (FETD) method for transient analysis of multiscale electromagnetic problems, where electrically fine structures with details much smaller than a typical wavelength and electrically coarse …
-
Efficient modeling and waveform inversion of multicomponent seismic data for anisotropic media
… efficiency. Comparison with results from the spectral-element method (SEM) demonstrates the high accuracy of the algorithm. Next, this methodology is extended to a coupled fluid/solid medium to accurately handle the boundary conditions at the seafloor for marine seismic applications. Numerical …
-
Low-order finite element preconditioner for spectral element pressure solver in Navier-Stokes equations
High-order spectral element methods (SEM) while very accurate for computational fluid dynamics (CFD) simulations can be prohibitively expensive for meshes with difficult geometries. Controlling the number of iterations in the pressure solver can significantly reduce the computing time of CFD …