This thesis was set to tackle the gas coning problem in oil-rim reservoirs with horizontal wells. The focus was short term production planning in the sub-critical phase only. Different controllers were developed and assessed based on the objective of netpresent-value (NPV) of oil produced in the sub-critical phase. The reservoir model is a 1-D partial differential equation describing the dynami...

Three ways in which near-boundary processes influence the ocean are reviewed. In the first topic, solutions for the flow and stratification in a situation where mixing dies away slowly away from a sloping boundary can show a sensitivity to the eddy Prandtl number, emphasizing the importance of studying the mixing of momentum as well as buoyancy. In the second topic, the importance of near-bound...

Abstract: A method to design a boundary controller for global stabilization of threedimensional nonlinear dynamics of flexible marine risers is presented. Equations of motion of the risers are first developed in a vector form. The boundary controller at the top end of the risers is then designed based on Lyapunov’s direct method. It is shown that when there are no environmental disturbances, th...

1 Motivating Examples 4 1.1 Stationary Optimal Heating Problems . . . . . . . . . . . . . . . . . . . 4 1.1.1 General Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.2 Boundary Control . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1.3 Distributed Control . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 Transient Optimal Heating Problems . . . . . . . . . . ....

In this paper, we address the problem of control of the transmission wave equation. In particular, we consider the case where, due to total internal reflection of waves at the interface, the system may not be controlled from exterior boundaries. We show that such a system can be controlled by introducing both boundary control along the exterior boundary and distributed control near the transmis...

In this paper we study the finite element approximation for boundary control problems governed by semilinear elliptic equations. Optimal control problems are very important model in science and engineering numerical simulation. They have various physical backgrounds in many practical applications. Finite element approximation of optimal control problems plays a very important role in the numeri...

This work presents an approach to predicting loss-of-control with the goal of providing the pilot a decision aid focused on maintaining the pilot’s control action within predicted loss-of-control boundaries. The predictive architecture combines quantitative lossof-control boundaries, a data-based predictive control boundary estimation algorithm and an adaptive prediction method to estimate Mark...

Tip leakage loss introduces major part of losses of the rotor in axial gas turbines. Therefore, the rotor blade tip has a considerable effect on rotor efficiency. To understand the flow physics of the rotor tip leakage, we solve the flow field for different tip platforms (passive flow control) and by considering coolant tip injection (active flow control). Various blade tip configurations s...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 background : work-related stress has increased during recent years throughout the world as well as in developing countries. studies demonstrate that work-related stress can have a negative effect on the quality of life, productivity, and as a result lead to considerable socioeconomic consequences. the purpose of the curren...