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 20 of 38 for “"steady state solution"”.
-
A Numerical Study of Burgers' Equation With Robin Boundary Conditions
This thesis examines the numerical solution to Burgers' equation on a finite spatial domain with various boundary conditions. We first conduct experiments to confirm the numerical solutions observed by other researchers for Neumann boundary conditions. Then we consider the case where the …
-
Dynamic simulation of chemical processes
… oriented simulation package which allows solution of dynamic and steady state equations. The steady state can be used to initialise the dynamic simulation. A robust non linear algebraic equation solver has been implemented for steady state solution. This has increased the general …
-
Essays on Economic *Growth
… into the R&D-based model of Romer (1990). The steady-state solution for the decentralized economy follows a growth-accounting exercise which provides quantitative information regarding the sources of growth. The model is calibrated to data and parameter estimates from various studies. It turns …
-
Time-domain based steady-state initialization for the EMTP
The existing steady-state initialization algorithm in the electromagnetic transients program EMTP is based on a frequency-domain admittance method. This yields a simple, efficient solution for linear, lumped element networks. However, the basic algorithm cannot be easily extended to handle …
-
Numerical simulation of primary petroleum migration
… scheme, and the form of the numerical solution is compared to a steady-state solution. The effects of two non-dimensional parameters are investigated. Based on these investigations, the compressibility of the fluid and the rate at which oil is generated appear to have significant roles …
-
A preconditioned Newton-Krylov method for computing steady-state pulse solutions of mode-locked lasers
… matrix-implicit Newton-Krylov solver. Solutions are obtained at least an order of magnitude faster than with dynamic simulation, the standard method. Our method is demonstrated experimentally on a one-dimensional temporal model of an eight femtosecond mode-locked laser operating in the …
-
Elongational Flows in Polymer Processing
… prove existence, uniqueness, and regularity of solutions. Our solution strategy will be developed in detail for the viscous case. For non-Newtonian and isothermal flows, we shall outline the general ideas. Our solution technique consists of energy estimates and fixed-point arguments in …
-
Low Phase Noise Oscillator Design. A Design Methodology for Improving Performance: Theoretical Analysis, CAD Simulations, and Prototype Building
… techniques for estimating the periodic steady-state solution, perturbation-projection vector, and phase noise/timing jitter for oscillators are presented. These techniques enable a quantitative estimate of the oscillator phase noise/timing jitter performance from its constituent circuit …
-
Hybrid atomistic-continuum formulations for gaseous flows
… test problems. For the case of incompressible steady gaseous flows a hybrid formulation is developed using a finite element method for the continuum subdomain and the direct simulation Monte Carlo (DSMC) method for the atomistic subdomain. The Schwarz alternating method is used to couple both …
-
Methods for engineering sub-two-cycle mode-locked lasers
… presenting a method to efficiently solve for the steady-state solution of a nonlinear cavity, suitable for simulating a solid-state femtosecond laser. The algorithm directly solves the periodic boundary value problem by using a preconditioned Krylov-Newton shooting solver. The method can be …
-
Preconditioned conjugate gradient methods for the Navier-Stokes equations
… formed at each time-integration step of the unsteady, two-dimensional, compressible Navier-Stokes equations of fluid flow. The Navier-Stokes equations are cast in an implicit, upwind finite-volume, flux split formulation. Preconditioning techniques are employed with the Conjugate Gradient like …
-
Assessment of the Thermal Improvements Awarded by Horseshoe Vortex Elimination on a Turbine Stator Blade in Computational Fluid Dynamics and Conjugate Heat Transfer
… viscous and turbulent. The analysis looks at the steady-state solution only. The meshing operation and the calculations are made using NASA-developed 3D codes: TCGRID and Swift. The author concludes that the drop in blade surface temperature reaches 109.6 K in a designated region of the tip. Many …
-
A 2 1/2 dimensional thermohaline circulation model with boundary mixing
… are derived and numerically solved to obtain steady state solution. The basic circulation features are revealed in our dynamical model. An equtorially asymmetric meridional circulation is observed due to small perturbation at the surface temperature in the high latitude. The density …
-
On the rolling motion of viscous fluid on a rigid surface
… showed that there exists a non-singular local solution in the vicinity of the contact line for any capillary number. A simplified asymptotic model is used here to find a global solution with a 180 contact angle. Also the effects of insoluble surfactant are checked and numerical results show …
-
Nonlinear hydrodynamic instability and turbulence in eccentric astrophysical discs
… which maintains the stratified and oscillatory steady state solution to machine precision. This implementation is employed to study the nonlinear outcome of this parametric instability in eccentric discs with vertical structure. Stratification is found to constrain the perturbation energy near …
-
Distributed analysis of Markov chains
… concurrent systems. The systems in question are state transition systems from which Markov chains can be derived. Both phases of the analysis pipeline are considered: state space generation from a state transition model to form the Markov chain and finding performance information by solving the …
-
Transient oxygen consumption rate measurements with the BDT̳M̳ oxygen biosensor system
… the general species transport equations for a steady-state solution has not accurately converted pO₂ measurements to OCR. Furthermore, the time to reach steady-state is prohibitively long (at least 5 hr). Transient OBS experiments have been conducted and the rate of p02 change has been shown to …
-
A 2 1/2 dimensional thermohaline circulation model with boundary mixing
… are derived and numerically solved to obtain steady state solution. The basic circulation features are revealed in our dynamical model. An equtorially asymmetric meridional circulation is observed due to small perturbation at the surface temperature in the high latitude. The density …
-
Shape and Structural Optimization of Flapping Wings
… Zimmerman method to describe the wing. A quasi-steady aerodynamics model is used to calculate the thrust and input power required during the flapping cycle. An assumed inflow model is derived based on lifting-line theory and is used to better approximate the effects of the induced drag on the …
-
Analysis of a Rotary Ultrasonic Motor for Application in Force-Feel Systems
… model to show the differences in the transient solution, agreement in the steady state solution, and above all that it is an efficient tool for approximating a motor's steady state response as a function of varying the motor parameters. In addition, the reduced model provides the means of …
Page 1 of 2