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 20 of 37 for “"Fully-implicit"”.
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A hybridized discontinuous galerkin method for fully implicit petroleum reservoir simulation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Development of a fully implicit two-fluid, thermal-hydraulic model for boiling water reactor transient analysis
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1980.
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Theoretical and numerical results for electrorheological fluids
… of solutions (2D + 3D), pressure stabilization, fully implicit Euler time discretization, and Meyer type estimates.
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Relativistic neutron stars in general relativity and fourth order gravity
… as opposed to the more computationally intensive fully implicit schemes or other adaptive Runge Kutta methods that may be impractical for partial differential equations. The first problem is focused on the mass-radius relation of a neutron star under a quadratic f(R) = R+αR2 theory for various …
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Development of implicit kinetic simulation methods, and their application to ion beam propagation in current and future neutralized drift compression experiments
… of plasma are solved numerically using two implicit Particle-in-Cell methods. The implicit nature of the time-differenced gov- erning equations leads to unconditional numerical stability. The primary numerical scheme is based on an implicit moment Particle-in-Cell approach. It has been …
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Numerical Simulation of Multiphase Flow in Fractured Porous Media
… pressure interface condition. The method is fully coupled and fully implicit and employs a mixed-dimensional formulation with lower dimensional elements in the fractures. The method features unstructured grids, adaptive refinement and multigrid methods. It is implemented for twodimensional …
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Turbomachinery cascade and wake calculation for two-dimensional compressible laminar and turbulent flow
… boundary layers. The boundary layer solution is fully implicit and formally second order accurate. The viscous inviscid coupling is performed utilizing thin airfoil theory. Numerical solutions are presented for several numerical test cases and compared with published test data.
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One Dimensional, Transient Model of Heat, Mass, and Charge Transfer in a Proton Exchange Membrane
… within the membrane. The model is solved using a fully implicit finite difference approach. Results showing the effects of current density, pressure gradients, water and heat fluxes, and fuel cell start-up on water concentration, temperature, and proton potential across the membrane are presented.
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Scalable High-Resolution Simulation of the Prey-Predator Model, with a Non-Local Consumption of Prey
… present a challenge to traditional explicit or fully implicit solvers. This study overcome this barrier by incorporating a third-order Krylov Subspace Spectral (KSS) time integrator into a Fourier spectral spatial discretization. KSS, which treats each Fourier mode with a frequency-dependent …
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Stabilized finite elements for compressible turbulent Navier-Stokes
… Petrov-Galerkin (SUPG) scheme. A fully implicit methodology is used to obtain steady state solutions or to drive unsteady problems at each time step. Order of accuracy is assessed for inviscid and viscous flows in two and three dimensions via the method of manufactured solutions. …
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Modeling of non-equilibrium effects on a double wedge configuration in hypersonic flows
… scheme and the time is carried out using the fully implicit Backward Euler scheme. The numerical predictions obtained show significant extent of thermal non-equilibrium between vibrational and translational energy modes, whereas chemical non-equilibrium is present only in the air case, since …
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Simulations of thermophoretic deposition in wavy channels
… soot deposition. This study developed a fully implicit code with variable property consideration and boundary fitter coordinates to model the fluid flow, heat transfer, and soot deposition in wavy channels. The code was then used to study laminar and turbulent flow with Reynolds numbers …
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Validation Studies of Single-Phase Natural Circulation Response of the Fluoride salt-cooled High-temperature Reactor (FHR)
… to allow for an explicit (forward Euler), semi-implicit (Crank Nicolson), or fully implicit (backward Euler) solution. The models used to approximate the density integral were also modified to account for a variable mesh scheme. The code was benchmarked against the original code developed at …
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Black Liquor Droplet Combustion and Modeling
… scheme for combined advection diffusion, and the fully-implicit scheme for the time step. It predicts internal velocities, gas and solid temperatures (assumed equal), pressure, and composition. Pressure and velocity equations use Darcy's Law for flow through a porous medium. Modeling results show …
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A new parabolized Navier-Stokes scheme for hypersonic reentry flows
… limited in their applicability. A new implicit fully-iterative Parabolized Navier-Stokes (PNS) scheme is developed to accurately predict such low-Reynolds number flows. In this new approach the differential equations governing the conservation of mass, momentum and energy, and the …
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Computational Techniques for the Analysis of Large Scale Biological Systems
… stochastic simulation algorithms based on a fully implicit approach and on stochastic Taylor expansions. Next Generation RNA-Sequencing, a high-throughput technology to sequence cDNA in order to get information about a sample's RNA content, is becoming an efficient genomic approach to uncover …
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An hp-Adaptive Petrov-Galerkin Method for Steady-State and Unsteady Flow Problems
… of a modified linear elasticity equation. A fully implicit linearization has been utilized within a Newton-type algorithm to advance each iteration or time-step, for steady-state or unsteady simulations, respectively. In order to navigate the adaptation process, adjoint-based and …
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Model-Based Experimental Investigation of Hydrogenase-Like Electrocatalytic Inactivation and Activation Mechanisms
… of highly complex electrocatalytic mechanisms. Fully model-based approaches combined with the Butler-Volmer model is employed from a pure theoretical model to a validation of practical chemical reactions. The initial chapters introduce the fundamentals and applications of the electrochemistry. …
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Modelling and simulation of drying process for ceramic membrane fabrication
… the drying process. The governing system of fully coupled non-linear partial differential equations of the model was derived from a mechanistic approach where the mass and energy conservation laws are defined for a particular phase into which Darcy’s law and Fick’s law are substituted. A …
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An Implicit Finite-Volume Depth-Integrated Model For Coastal Hydrodynamics And Multiple-Sized Sediment Transport
… same framework. The model uses a second-order fully implicit temporal scheme and first- and second-order spatial discretizations including corrections for grid non-orthogonality. The hydrodynamic equations are solved using an iterative pressure-velocity coupling algorithm on a collocated grid …
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