Made available in DSpace on 2014-12-17T13:57:18Z (GMT). No. of bitstreams: 1 FernandoJMC_ate_referencias.pdf: 2000893 bytes, checksum: 7383eee0619fc2770d78eab5d841f5cd (MD5) Previous issue date: 2001-04-18 / The present work studies the natural ventilation and its relationship with the urban standards, which establishes the form of occupation and use of the land in our cities. The method simulates the application of the urban standards of the City Master Plan over the last three years. The simulation takes place in the District of Petr?polis, in the city of Natal , Brazil and analyses the effects of the standards of natural ventilation. The formulated hypothesis states that the reductions in the urban spaces between buildings rises up the vertical profile of ventilation, reducing, therefore, the velocity of the wind at the lower levels of the buildings. To develop the study, occupation models were built, using computerized, three-dimensional models. These occupation models were analyzed using the CFD (Computational Fluid Dynamics) code. The conclusion is that the more we reduce the urban space between buildings, the more we reduce the wind speed in constructed areas, increasing, therefore, the possibility to generate heat islands / O objetivo deste trabalho ? o estudo da ventila??o natural e a sua rela??o com as normas edil?cias. O trabalho simula a aplica??o das prescri??es urban?sticas dos ?ltimos tr?s Planos Diretores de Natal em um trecho do tecido urbano do bairro de Petr?polis, analisando os efeitos sobre a ventila??o natural. A pesquisa parte da hip?tese de que a redu??o dos recuos e a conseq?ente diminui??o da porosidade na massa edificada, eleva o n?vel do gradiente de ventila??o, reduzindo a velocidade dos ventos nos n?veis mais baixos das edifica??es. Para o desenvolvimento do estudo, s?o produzidos modelos de ocupa??o com recursos de modelagens computadorizadas em tr?s dimens?es, as quais s?o posteriormente submetidas ? an?lise em programa de Mec?nica dos Fluidos Computadorizada. Conclui-se que a redu??o sucessiva nos ?ndices que definem os afastamentos m?nimos entre os edif?cios, produz a redu??o da velocidade dos ventos em ?reas adensadas, aumentando a possibilidade de forma??o de ilhas de calor