Numerical investigation of V/STOL jet induced interactions

Direct numerical simulation using the full three dimensional, time dependent Navier-Stokes equations is used to investigate V/STOL jet induced interactions. The objective of this numerical simulation is to compute accurately the details of the flow field and to achieve a better understanding of the physics of the flow, including the role of initial turbulence in the jet, the influence of forward motion on hover aerodynamics, the collision zone and fountain characteristics. Preliminary results are presented

User's manual for an aerodynamic optimization scheeme that updates flow variables and design parameters simultaneously

This user's manual is presented for an aerodynamic optimization program that updates flow variables and design parameters simultaneously. The program was developed for solving constrained optimization problems in which the objective function and the constraint function are dependent on the solution of the nonlinear flow equations. The program was tested by applying it to the problem of optimizing propeller designs. Some reference to this particular application is therefore made in the manual. However, the optimization scheme is suitable for application to general aerodynamic design problems. A description of the approach used in the optimization scheme is first presented, followed by a description of the use of the program

Postscript: Beirut Life and Debt Version 2.016

This essay continues a project begun a decade ago with the article, “A Matter of Life and Debt: The Untold Costs of Rafiq Hariri’s New Beirut.” This new article, or “Postscript,” begins by examining the reception of that first investigation and responds to one criticism directed at the original essay: that it proffers an unfairly pessimistic profile of the reconstruction effort generally and of its prime mover specifically, the now-deceased Prime Minister Rafiq Hariri. This paper follows a cost/benefits analysis of the project and the company behind it, Solidere, and examines two other Solidere-styled developments abroad, both results of the company’s attempts to monetize its so-called “brand.” The first of these, “Abdali,” is in Amman. The second of these comprises a trio of projects that SI prepared for Sheikh Zayed City in metropolitan Cairo. The paper argues that Solidere’s failure to disclose the dubious financial dealings behind such projects further erodes the credibility of a company for whom the notion of “business as usual” works first and foremost to benefit the few at the expense of the many