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Showing 1 to 20 of 28 for “"spherical-shell"”.
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Studying 3D Spherical Shell Convection using ASPECT
… Cartesian as well as 2- and 3-dimensional spherical-shell convection cases. All cases use the Boussinesq approximation. The 2D cases come from Blankenbach et al. (1989), van Keken et al. (1997), and Davies et al. (in preparation). Results for 2D cases agree well with their respective …
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Plastic response of a spherical shell to an underwater explosion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1984.
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Variable Viscosity Thermal Convection at Infinite Prandtl Number in a Thick Spherical Shell
… convection at infinite Prandtl number in a thick spherical shell is modeled using the finite element method. The discretized tensor Navier-Stokes equations are solved with the multigrid method applied to the spherical elements. Numerically convergent solutions can be obtained when specially …
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Buckling of an equatorial segment of a spherical shell loaded by its own weight
Nonlinear shallow shell equations are derived for a thin shell of revolution having the shape of a narrow segment of a toroidal shell centered at the equator. The equations are derived by considering a cylindrical shell, described by nonlinear Donnell theory, with an initial radial deformation. …
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Convection in a differentially heated rotating spherical shell of Boussinesq fluid with radiative forcing
… contained in a rotating, differentially heated spherical shell. Previous work, on the spherical shell of Boussinesq fluid, differentially heated the shell by prescribing temperature on the inner boundary of the shell, setting the temperature deviation from the reference temperature to vary …
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Stability Analysis of a Uniform Liquid Fuel Layer Inside a Spherical-Shell Cryogenic Inertial Confinement Fusion Target
Made available in DSpace on 2017-07-06T18:48:45Z (GMT). No. of bitstreams: 2 Islam_Raja_Mohammad_M_MS.pdf: 57966992 bytes, checksum: 774ac38e7d70bf690f44983a07398abe (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1988
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Temperature Effects on the Behavior of Liquid Hydrogen Isotopes Inside a Spherical-Shell Inertial Confinement Fusion Target
… which will result in high fusion yield. A spherical shell containing a uniform liquid (or solid) deuterium-tritium (D-T) layer on the inner surface represents one of the most popular high-gain ICF target configurations. The uniformity of the D-T layer is a must to achieve the desired high …
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Stresses in a Spherical Shell Due to a Uniformly Distributed Internal Pressure and an Attached Cylindrical Nozzle
Made available in DSpace on 2014-12-04T23:10:58Z (GMT). No. of bitstreams: 1 5904507.pdf: 1824034 bytes, checksum: 3c310c91cf8486a5a1a18ea653f67bfb (MD5) Previous issue date: 1959
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The temperature distribution on a spherical shell in the presence of a primary radiative source and a reflecting and radiating infinite plane
A thin-walled conducting spherical shell, rotating with a constant angular velocity about an axis of rotation oriented perpendicular to an infinite plane located at some unspecified distance from the shell, is exposed to a distant source of parallel radiation. The plane is assumed to radiate …
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Casimir Force in Non-Planar Geometric Configurations
… (2) the hemisphere-hemisphere and (3) the spherical shell. The resulting Casimir forces for these physical arrangements have been found to be attractive. The repulsive Casimir force found by Boyer for a spherical shell is a special case requiring stringent material property of the sphere, …
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Attitude Dynamics of Debris Resulting From Upper Stage Fragmentation in Low Earth Orbit
… purpose of the study: a thin plate, a monocoque shell, an half conical shell and a spherical shell, and it has been assumed that they are fabricated from aluminum alloy. The motion of conducting body in a magnetic field generates eddy currents which create a torque in the opposite direction of …
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Creep buckling of shells of revolution loaded under uniform external pressure
… into the creep instability of two common shells of revolution, the infinitely long cylinder and the complete sphere. The linear and non-linear visco-elastic material idealizations are used in the various theoretical procedures. The critical buckling time is greatly influenced by the …
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PROBABILISTIC METHOD IN RADIATIVE TRANSFER AND NEUTRON TRANSPORT PROBLEMS
… capable of interpreting the transfer problems in spherical geometry. As the basic inspiration of the probabilistic method was drawn from Ambartzumian's physical method of principle of invariance, it has been thought worthwhile to examine the merits and limitations of all the methods whose origins …
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A regression-based approach for simulating feedfoward active noise control, with application to fluid-structure interaction problems
… control simulation is developed for a submerged spherical shell using both analytical and numerical techniques; the numerical formulation is found by discretizing the integrations used in the analytical approach. ASAC is shown to be effective for controlling radiation from the spherical shell. …
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Geodynamic Modeling Applied to Venus
… and physics. Here I perform several thermal 3-D spherical shell tests using the geodynamic code ASPECT, and compare the results against the legacy code CitcomS. I find that these two codes match to within 1.0% using a number of parameters. The application of geodynamic modeling is also …
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A computational and experimental study of the underwater implosion of single and multiple metallic spherical shells
… the implosion behavior of single and multiple spherical shells. Over the course of this research, I designed and predicted the collapse depth of metallic spherical volumes using shell buckling theory, then used a computational tool to model several implosion scenarios of both single and …
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Dynamics of the North American Plate: Numerical Development, Mantle Flow Modeling, and Receiver Function Analysis
… of this new code for mantle flow modeling in 3-D spherical shell geometry at the beginning of my doctoral study, I first developed a new geoid algorithm for the 3-D spherical AMR numerical modeling based on ASPECT. Then I systematically benchmarked the velocity, dynamic topography, and geoid …
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Experimental and modeling analysis of near-field scattering from complex targets
… targets and subcritically insonifying an empty spherical shell. Specifically, the arrival times of different waves known to be generated by scattering from cylindrical and spherical shells have been computed at different azimuths and vertical angles. These traces have been obtained by analyzing …
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Turbulent convection in the anelastic rotating sphere : a model for the circulation on the giant planets
… dynamics of a whole sphere of gas rather than a spherical shell (including the strong variations in gravity and the equation of state). Different from most previous 3D convection models, this model is anelastic rather than Boussinesq and thereby incorporates the full density variation of the …
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Flow and stability studies in porous media based on some non-Darcian models.
… a porous sphere and creeping flow past a porous spherical shell are considered to illustrate the point. Then, a theoretical look is taken at the problem of steady convection in porous media, again using the generalized Brinkman equation. A variational formulation is introduced to define a weak …
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