Utilizing open source software running in inexpensive high performance computing system for cfd applications

The high cost of conducting research is a significant issue for the successfulness of any research project. For research activities involving flow simulation, the licensing fee for the numerical software and the cost to acquire powerful machine are the main factors contributing to the high cost. This paper reports our experiences in setting up a cost effective way of doing computational fluid dynamics (CFD). The actions involve two areas, i.e., software and hardware. For the software, open source softwares are utilized, particularly the OpenFOAM(r) as the CFD package. For the hardware, a parallel computer made from a cluster of inexpensive desktop computer is constructed. This architecture is found able to meet our requirement in investigating various flow problems that include aeroacoustics, vibration and wind engineering for ventilation

Analysis of transmission lightning arrester locations using Tflash

Tropical countries with extensive lightning activity, such as Malaysia, encounter numerous problems on their electrical transmission and distribution systems. Many overhead lines trip because of back flashover of lightning and shielding failures of the grounding system. To overcome the problem and improve transmission line performance, a detailed lightning study is required to analyse the corresponding lines and determine the best location for transmission line arrester (TLA) installation. We used TFlash to analyse a TLA installation on a 132-kV SSWW-BBST overhead transmission line system located in Selangor, Malaysia. Based on the results, the installation of the TLA at the optimum quantity and at appropriate towers have reduced the number of lines that trip

Testing For Unit Roots In The Presence Of Multiple Trend Breaks: An Application To Chilean Inflation Rate Series

This paper is an application of the subject of testing for unit roots in a time series in the presence of structural change. The series used is that of the Chilean monthly inflation rate. A characteristic of this series is that, with the exception of the 1972-1977 period during which the inflation rate in Chile greatly accelerated then decelerated, the Chilean inflation rate over the 40-year period of the study stayed within a limited range. In spite of this relatively stable performance, the application of the standard unit root tests to the series results in the inability to reject the unit root. However, when a test that allows for three endogenously determined breaks in the slope of the trend function of the series is used to account for the structural change of the 1972-1977 episode; the result is a strong rejection of the unit root in favor of a, more reasonable, stationary characterization of the series

Effects of Capital and Type of Business on Coastal Muslim Women's Business Income in Aceh Province

This study aims to analyze the influence of capital variables and type of business on the income of Muslim women living in coastal areas in Aceh Province. The population in this study is Coastal Women who do business in Aceh Province by selecting samples using a purposive sampling technique with the criteria that women who do business have a fishing husband, living on the coast in the districts of Nagan Raya, Lhokseumawe and Aceh Besar. Primary data were obtained from interviews and questionnaires with coastal women as many as 90 coastal women doing business. Whereas secondary data was obtained from the Central Statistics Agency (BPS), District Community Empowerment Agency (BPM) and the internet. The analysis first uses the validity and reliability test and then the hypothesis is tested using multiple regression tests to find out whether an independent variable influences the motivation of coastal women with a significance level of 5% which aims to see how the overall relationship between capital and type of business affects women's business income Muslims in Aceh Province. The results show the simultaneous influence of both Capital Variables (X1) and Type of business (X2) significantly influencing Muslim women's Business Income. Based on the regression coefficient of the Capital Variable (X1) and Business Type (X2) partially there is a positive and significant effect on the Coastal Muslim Women's Business Income in Aceh Province.  DOI: https://doi.org/10.5281/zenodo.367238

The Effect Of Needs For Performance, Affiliation, And Domination On The Motivation Of Coastal Women Business In Aceh Province

This study aims to analyze the effect of Variables of Performance, Affiliation, and Domination on the motivation of women living in coastal areas doing business in Aceh Province. The population in this study are Coastal Women who do business in Aceh Province by selecting samples using a purposive sampling technique with the criteria Women who do business have fishermen husbands, live on the coast in Aceh Province. The hypothesis is tested using multiple regression tests to determine whether an independent variable influences the motivation of coastal women to see how the overall relationship between Performance, Affiliation, and Domination affects women's motivation to do business in Aceh Province. The results show simultaneously that the effects of the three Performance Variables (X1), Affiliation (X2) and Domination (X3) significantly influence Women's Work Motivation. Based on the regression coefficients Variable Performance (X1), Affiliation (X2) and Domination (X3) partially there is a positive and significant influence on the Motivation of Women's Business Work in Aceh Province

Design parameters for the development of wing test rig for static test experiment / Ramzyzan Ramly … [et_al.]

Airplanes are designed to stay aloft with the help of wings on both sides. In operation at cruising speed, the wings are subjected to load as much as the weight of the whole aircraft. However during manuever, the wings are subjected much higher load and stress and this stress should be sustained by the wings within its limit load without causing permanent deformation to the strucutre. In order to assess how much stress the wings are subjected to, the wings should be tested on ground which is called static test. To proof that a design is good, a numerical analysis should be verified by experimental analysis. The static test can be done in a test rig. The test rig however should be much stronger than the object to be tested. Therefore, the design parameters such as materials selection, design configuration, mounting types, points of load application, boundary conditions are among the parameters to be studied in the development of the test rig. From the research, the simulation was done using CATIA software and the numerical tests was done using ANSYS software. The results from the simulation provided a good picture of the test rig and a prototype was developed using a 40% scale af the actual size being studied