A series of RANS-based aerodynamic shape optimization for an 800-passenger blended-wing-body aircraft is performed. A gradient-based optimization algorithm and a parallel structured multiblock RANS solver with Spalart–Allmaras turbulence model are used. The derivatives are computed using a discrete adjoint method considering both frozen-turbulence and full-turbulence assumptions. A total of 274...

Abstract Reconstructing river planform is crucial to understanding ancient fluvial systems on Earth and other planets. Paleo-planform typically interpreted from qualitative facies interpretations of strata, but these can be inconsistent with quantitative approaches. We tested three well-known hydraulic predictors in Cretaceous strata (in Utah, USA) where there a facies-derived consensus paleo-p...

We develop a new method for analysis of meandering channels based on planform sinuosity. This analysis objectively identifies three channel reach lengths based on sinuosity measured at those lengths: the length of typical, simple bends; the length of long, often compound bends; and the length of several bends in sequence that often evolve from compound bends to form multi-bend loops. These leng...

INTRODUCTION ................................................................................... 523 I. BACKGROUND ........................................................................... 525 A. Common Law Research Exception ......................................... 525 B. The Statutory Safe Harbor Provision: 271(e)(1) .................... 528 II. CASE LAW: THE SAFE HARBOR STATUE PROTECTION ...

This paper examines several niching and elitist models applied to Multiple-Objective Genetic Algorithms (MOGAs). Test cases consider a simple problem as well as multidisciplinary design optimization of wing planform shape. Numerical results suggest that the combination of the fitness sharing and the best-N selection leads to the best performance.

a r t i c l e i n f o Geologists, physicists, and mathematicians have studied ripples and dunes for more than a century, but despite considerable effort, no general model has been proposed to explain perhaps the most fundamental property of their morphology: why are some bedforms straight, continuous, parallel, and uniform in planform geometry (i.e. two-dimensional) whereas others are irregular...