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 59 for “"Energy equation"”.
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Evaluation of the symmetrical zonal kinetic energy equation.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1970.
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Camada limite de temperatura com gradiente de pressão adverso
The Prandtl's boundary layer energy equation has been solved by integral methods using a polinomial biparametric velocity profile with variable exponent as suggested by Geropp and a temperature profile presented by Van Driest which is modified to consider the presence of the pressure gradient. The …
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Extension of the finite volume method to laminar and turbulent flow
… the Reynolds-averaged form of the Navier Stokes equations. The entire calculation is performed in the physical domain. The method is currently limited to the calculation of attached flows. The features of the current method can be summarized as follows. Control volumes are chosen so that …
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Direct Numerical Simulation of Turbulence in a Model Solid Rocket Motor
… of subgrid terms in the filtered evolution equations. It is found that in the equations for mean momentum and resolved scale Reynolds stress, the dominant subgrid terms are the subgrid stress terms. The contribution of subgrid stress to wall normal transport and dissipation in the resolved …
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Dark energy and CMB anisotropy
… We propose a scalar field model of the dark energy as a mechanism for suppressing low l multipoles through late-Universe evolution of metric fluctuations and the integrated Sachs-Wolfe (ISW) effect. We find that for a constant dark energy equation of state, theoretical predictions actually …
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Modeling optically activated high power semiconductor switches
… switch. The model solves the continuity equations for electrons, holes, and traps, the energy equation for the lattice, Poisson's equation, and a circuit equation. Physical effects in the model include band-to-band impact ionization, trap impact ionization, photoionization, recombination …
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Computational Bayesian techniques applied to cosmology
This thesis presents work around 3 themes: dark energy, gravitational waves and Bayesian inference. Both dark energy and gravitational wave physics are not yet well constrained. They present interesting challenges for Bayesian inference, which attempts to quantify our knowledge of the universe …
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The unstructured grid incompressible Navier-Stokes algorithm for convective heat transfer based on artificial compressibility
… solving the full incompressible Navier-Stokes equations along with the energy equation in a strongly coupled manner is presented. The Boussinesq approximation is utilized to account for thermal buoyancy. The method of artificial compressibilty is used to solve the resulting equations in a time …
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Numerical Analysis of Heat and Mass Transfer From Bubbles, Drops, and Rigid Spheres
… fluid spheres in shear flow is considered. The energy equation is solved using finite difference techniques. A method known as upwind differencing is used in approximating the convective terms. Far from the sphere, a 'transmitting' boundary condition is introduced; the dimensionless temperature …
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Energy methods for analyzing drag and inertia in cycling kinematics
… of time. Rolling resistance, drag, inertial energy, and potential energy were then evaluated. An integral energy equation relating these terms to input power was developed. This is much more stable numerically than differential equations in the power and force equations. This formula gave …
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Heat transfer in nano/micro multi-component and complex fluids with applications to heat transfer enhancement
… here is based on solving the lattice Boltzmann equation for the fluid phase, as it is coupled to the Newtonian dynamics equations to model the movement of particles and the energy equation to find the thermal properties. This is a direct numerical simulation that models the free movement of the …
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Análise de problemas conjugados em microssistemas térmicos com múltiplas correntes e geometrias complexas via transformação integral
… with spatial variation introduced in the energy equation, that allow to unify the formulations in the solid and fluid regions. Convergence acceleration alternatives of the expansions in autofunctions are analyzed, including the rearrangement of the terms in the expansion based on the …
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Comparisons of computational methods to represent electron transport in nonequilibrium plasma devices
… the two-dimensional, time dependent model, fluid equations are solved to obtain the electron and ion densities, and Poisson's equation is solved for the electric potential. These equations can be solved using the local field approximation (LFA), employing conservation equations for the bulk …
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The influence of thermal polution on various aspects of the biology of three species of crab
… is presented in this paper. Parameters of the energy equation C = Pg + R + Uₑₓ + F + Uₑ have been measured for adult Plagusia chabrus, Hymenosoma orbiculare and Cyclograpsus punctatus. It appears that rate-temperature responses increase with increase in temperature for all three species. …
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Solution of the laminar boundary layer of a semi-infinite flat plate given an impulsive change in velocity and temperature
… steady-state and infinite-plate solutions of the energy equation and with a finite-difference solution of the unsteady continuity, momentum and energy equations. Agreement between the solutions was close enough to indicate that the approximate solutions for the temperature in the boundary layer …
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Nozzle Flow with Vibrational Nonequilibrium
… The flow is modeled using the Navier-Stokes equations that have been modified for vibrational nonequilibrium. The energy equation is replaced by two equations. One equation accounts for energy effects due to the translational and rotational degrees of freedom, and the other accounts for the …
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Thermodynamically consistent modelling and computational methods for multiphase flows
… is temperature dependent, and the classical energy equation is coupled with the Model H. We then investigate numerically an established phase-field model (Quasi- incompressible NSCH model) for the two-phase flows with varible density. We design a numerical method where the energy law of the …
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Thermodynamic Formation Conditions for Propane Hydrates in Equilibrium with Liquid Water
… for the hydrate phase and reduced Helmholtz energy equation for the fluid phases. Results are compared with highly variant literature data, where large deviations observed for the Lw-H-C3H8 (l) phase boundary can be mainly attributed to purity and experimental techniques used in the …
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Phase-field simulation of freezing water droplet
… handled by the Allen-Cahn and the Cahn-Hilliard equations, respectively. The governing equations, including the two phase-field equations, the Navier-Stokes equations, and the energy equation, are designed such that the non-negative entropy production is guaranteed. These equations are then …
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Tip leakage flow, heat transfer and blade lifing in a jet engine turbine
… experimental data. A combined solution of the energy equation in the tip gap flow and in the rotor blade tip gave tip temperature distributions. An independent computational study, using the same numerics as MEFP but a separate new computer program, was also performed to investigate the …
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