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Showing 1 to 15 of 15 for “"cut-cell"”.
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A dimensionally split Cartesian cut cell method for Computational Fluid Dynamics
We present a novel dimensionally split Cartesian cut cell method to compute inviscid, viscous and turbulent flows around rigid geometries. On a cut cell mesh, the existence of arbitrarily small boundary cells severely restricts the stable time step for an explicit numerical scheme. We solve this …
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Solving the Cartesian cut-cell interpolation problem with a tetrahedral mesh
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
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On a Cartesian cut-cell methodology for simulating atmospheric ice accretion on aircraft
… for common ice accretion test cases and find excellent agreement with literature. The advantage of the augmented system is demonstrated by applying it to an experimental setup that studies the heat exchange between water droplets and air for various flow conditions. We find excellent agreement …
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A cut-cell method for adaptive high-order discretizations of conjugate heat transfer problems
… comprised of the following components: a simplex cut-cell technique that generates multi-regioned meshes decoupled from the design geometry, a high-order discontinuous Galerkin (DG) discretization, and an anisotropic output-based adaptation method that autonomously adapts the mesh to minimize the …
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An energy-conservative cut-cell method and advanced B-spline-based filtering method for flow simulation
The student, Yong Yi Bay, submitted this Dissertation for approval on 2019-11-25 at 14:52.
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A simplex cut-cell adaptive method for high-order discretizations of the compressible Navier-Stokes equations
… for high-order discretizations and simplex, cut-cell mesh generation. First, output-based mesh adaptation consists of generating a sequence of meshes in an automated fashion with the goal of minimizing an estimate of the error in an engineering output. This technique is proposed as an …
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A robust simplex cut-cell method for adaptive high-order discretizations of aerodynamics and multi-physics problems
… manner. The framework consists of: a simplex cut-cell technique which allows the mesh generation process to be independent of the geometry of interest; a discontinuous Galerkin (DG) discretization which permits an easy extension to high-order accuracy; and an anisotropic output-based …
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An automated reliable method for two-dimensional Reynolds-Averaged Navier-Stokes simulations
… solutions to the RANS equations; and a simplex cut-cell mesh generation which autonomously provides higher-order meshes of complex geometries. The simplex cut-cell mesh generation method presented here extends methods previously developed to improve robustness with the goal of RANS simulations. …
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Anisotropic output-based adaptation with tetrahedral cut cells for compressible flows
… a finite-volume discretization for tetrahedral cut-cells is developed that makes possible robust, anisotropic adaptation on complex bodies. Through grid refinement studies on inviscid flows, this cut-cell discretization is shown to produce similar accuracy as boundary-conforming meshes with a …
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An output-based adaptive and high-order method for a rotor in hover
… applied to an isolated rotor in hover. A simplex cut-cell mesh generation technique is used to support robust and autonomous creation of higher-order meshes. The calculations are performed using a parallel implementation of the DG discretization and the results are compared to experimental data. …
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Development of an AMR Octree DSMC approach for shock dominated flows
… multi-scale physics. It is coupled with a robust cut-cell algorithm to incorporate complex triangulated geometries. With the use of distributed memory systems and Message-Passing-Interface (MPI) for communication, the code is potentially scalable. However, to simulate continuum-like conditions …
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Nanoscale surface modification of wood veneers for adhesion
Surface chemistry of wood is based on the exposed cut surface that is the combination of intact (lumen wall) and cut cell wall material. It is inherently complex and changes with history of processing. Modification of wood surface through noncovalent attachment of amine containing water soluble …
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Inverse problems in fluid dynamics for magnetic resonance velocimetry
… problem by implementing an adjoint-consistent cut-cell finite element method, and first test it for noisy synthetic images of 2D flow in a simulated aortic aneurysm. I then extend the method to noisy, sparsely-sampled signals, and test it for experimental flow through a converging nozzle. I …
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Automatic parallel octree grid generation software with an extensible solver framework and a focus on urban simulation
… of the target geometry, and as such, no cut-cell algorithm, projection method, or immersed boundary condition are implemented. In this case, 'zeroth' order means that no geometry is ever exactly represented in the final computational mesh: an octree element is either completely in the …
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Computational Fluid Dynamics with Embedded Cut Cells on Graphics Hardware
… of fluid dynamics simulations featuring embedded cut cells using the CUDA programming platform. We demonstrate efficient generation and handling of geometric surface data in rectilinear computational grids. This is added to a split Euler solver to define piecewise linear cut cells describing solid …