In the present paper suboptimal boundary control strategies for the time-dependent, incompressible flow over the backward-facing step are considered. The objective consists in the reduction of the recirculation bubble of the flow behind the step. Several cost functionals are suggested and a frame for the derivation of the optimality systems for a general class of cost functionals is presented. ...

flow regime in dam's bottom outlet is divided in pressurized flow and free surface flow by the gate located for discharge control. down stream tunnel involves high velocity multi component air –water flow studied by mathematical model. in this research work, we used finite volume mixture two phase flow model. because of high reynolds number, standard two equations k-e turbulence model was ...

To solve the incompressible Navier-Stokes equations in a generalized coordinate system, a high order solver is presented. An exact projection method/fractional-step scheme is used in this study. Convective terms of the Navier-Stokes (N-S) equations are solved using fifthorder WENO spatial operators, and for the diffusion terms, a sixthorder compact central difference scheme is employed. The thi...

Inspired by the study of Rao et al. (2019), aerodynamics a simplified frigate is investigated experimentally. The natural wake flow dynamics shown to be bi-stable at zero yaw angles, both rear ship superstructure and stern. strongly weakened stern when lifted off ground in free-stream. Perimetric cavities sufficient depth are able suppress symmetrize air-wake base pressure increases with cavity...

A test program to assess the influence of a negative G strap on restraint dynamics and human impact response was conducted at AFAMRL. There were 131 experimental-level impact tests with volunteer subjects performed in eight different test conditions. Forward-facing (-Gx) impacts were carried out on a horizontal accelerator, while vertical (+Gz) impact tests were done on a vertical drop tower fa...

In this work we will combine two important notions for the argumentation community into Abstract Argumentation Frameworks (AFs). These notions correspond to Toulmin’s backings and Pollock’s undercutting defeaters. We will define Backing-Undercutting Argumentation Frameworks (BUAFs), an extension of AFs that includes a specialized support relation, a distinction between different attack types, a...