Interactive Simulation of Fluid Flow

The simulation of fluid flow on rectangular grids using a discretized version of the Navier Stokes Equations for incompressible fluid flow can be simultaneously described as an aesthetically pleasing and computationally intensive embarrassingly parallel problem. Ideally, the aesthetics of the fluid simulation should, given some set of parameters, feel natural despite the synthetic nature of the underlying grids. This natural feel, paramount to the success of the system, should fool a person into believing that they are interacting with a real fluid. The number of calculations and data accesses increases with the number of cells present in the rectangular grid upon which the fluid is simulated. An increased number of calculations are required for augmented accuracy, different external forces, and additional dimensions. Since it is a trivial task to increase the complexity of the simulation, interactivity becomes a challenge of balancing accuracy, stability, and detail against speed of execution. A simple solution is to throw more processing power through increased instruction execution speeds or additional cores. Throwing additional cores at the problem strains the memory bus making it the point that slows down the simulation. Therefore for a given algorithm, respecting data locality and processor peculiarities can be used to minimize execution times. This document introduces a means of caching corrected velocity fields, a task scheduler that attempts to maximize the usage of the cache on multi-core processors, and a na\"ive compression algorithm based on run-length encoding

STUDY OF SEQUENTIAL EFFECTS OF BLAST WAVES IN CONFINED AND ADJACENT STRUCTURES

The study of the effect of explosive blast in confined spaces, particularly the conditions under which blast is transmitted to adjacent compartments and the effects produced, is of relevance for the vulnerability assessment of buildings, aircraft and ships, being of paramount importance in the context of national security and defence due to the permanent and diverse threats of present times. In particular it is aimed, through numerical modelling of the phenomena, to study the response of adjacent compartments, one of them subjected to an internal explosion, to identify the effect of compartment volume and material properties in the conditions that will cause rupture and loss of structural integrity and the effect in neighbouring structures of the sequential wave blast. Together with the study of the modes of collapse and rupture of materials used in naval shipbuilding, in this case the AA5083-H111 aluminium alloy, the present work will be the basis for the setting-up of a tool for the design of naval ships and vessels, providing the means to analyse and predict their vulnerability to several types of military ordnance

The 1998 Center for Simulation of Dynamic Response in Materials Annual Technical Report

Introduction: This annual report describes research accomplishments for FY 98 of the Center for Simulation of Dynamic Response of Materials. The Center is constructing a virtual shock physics facility in which the full three dimensional response of a variety of target materials can be computed for a wide range of compressive, tensional, and shear loadings, including those produced by detonation of energetic materials. The goals are to facilitate computation of a variety of experiments in which strong shock and detonation waves are made to impinge on targets consisting of various combinations of materials, compute the subsequent dynamic response of the target materials, and validate these computations against experimental data

Indoor air Quality and Its Effects on Health in Urban Houses of Indonesia: A case study of Surabaya

There is a possibility that the sick building syndrome has already spread widely among the newly constructed apartments in major cities of Indonesia. This study investigates the current conditions of indoor air quality, focusing especially on formaldehyde and TVOC, and their effects on health among occupants in the urban houses located in the city of Surabaya. A total of 471 respondents were interviewed and 82 rooms were measured from September 2017 to January 2018. The results indicated that around 50% of the respondents in the apartments showed some degrees of chemical sensitivity risk. More than 60% of the measured formaldehyde levels in the apartments exceeded the WHO standard, 0.08 ppm. The respondents living in rooms with higher mean formaldehyde values tended to have higher multiple chemical sensitivity risk scores. KEYWORDS: Indoor air quality, Sick building syndrome, QEESI, Formaldehyde, Developing countrie

Bibliography of Lewis Research Center Technical Publications announced in 1991

This compilation of abstracts describes and indexes the technical reporting that resulted from the scientific engineering work performed and managed by the Lewis Research Center in 1991. All the publications were announced in the 1991 issues of STAR (Scientific and Technical Aerospace Reports) and/or IAA (International Aerospace Abstracts). Included are research reports, journal articles, conference presentations, patents and patent applications, and theses

Reports of planetary geology and geophysics program, 1987

This is a compilation of abstracts of reports from Principal Investigators of NASA's PLanetary Geology and Geophysics program, Office of Space Science and Applications. The purpose is to document in summary form research work conducted in this program during 1987. Each report reflects significant accomplishments in the area of the author's funded grant or contract