توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱CFD Calculation of Axially Symmetric Supercavities
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین همایش انجمن هوافضای ایران، سال
تعداد صفحات: ۷
Engineering interest in natural and ventilated cavities about submerged bodies and in turbomachinery has led researchers to study and attempt to model large scale cavitation for decades. Comparatively simple analytical methods have been used widely and successfully to model developed cavitation, since the hydrodynamics of these flows are often dominated by irrotational and rotational inviscid effects. However, a range of more complex physical phenomena are often associated with such cavities, including viscous effects, unsteadiness, mass transfer, threedimensionality and compressibility. Through some of these complicating physics can be accommodated in simpler physical models, the ongoing maturation and increased generality of multiphase Computational Fluid Dynamic (CFD) methods has motivated recent research by a number of groups in the application of these methods for developed cavitation analysis. In this paper the numerical simulation of supercavitating flow was performed. The flow was assumed isothermal and consists of two phases, liquid and its vapor. A transport equation based cavitation model was used for the numerical simulation of the flow field including natural supercavitation. A mass transfer between the phases is treated as a source and sink terms in vapor transport equation. The numerical method is used for different geometries in a wide range of cavitation numbers. The cavity parameters such as cavity length and cavity width were compared with experimental data and agreed very closely.<\div>

۲Sevend, Local material, Local technology
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس بین المللی روشهای نوین طراحی و ساخت در معماری زمینه گرا، سال
تعداد صفحات: ۱۲
Iran is vast country that has different climatic zones. In each zone the indigenous people has their own sustainable noble solutions for confronting the climate difficulties. One of the most difficult climatic regions to live is hot and humid which is located at the Persian Gulf and Oman sea coast at the south of Iran. In this region Qeshm Island has more severe condition for comforting and Qeshm’s people have been seeking their own remedies for living by using the best of their region with the lowest technology over times.In this paper by doing survey on Qeshm climatic statics in 01 years, drawing and analyzing related graphs and data and also regarded to our own local experiences, using the wind circulation and shadow can be identified as the best and most optimum way to provide comfort condition in the island.vernacular architecture of Qeshm Island is also following these factors by using a semi–opened spaces as vital part of their architecture with indigenous appropriate materials like Sevend . This article is an attempt to understand Sevend as a locally available material for shading and ceiling in temporary and permanent buildings and structures in different dimensions of sustainable development (environmental, social and economic) and also describes the principals and methods of using it in the region. In addition architectural experience of the authors with Sevend will be illustrated and discussed.Unfortunately the recent construction in island has ignored this material and despite all the sustainable features that it has, this material and all of its related social and economical events is going to vanish. The authors believe that by Recognition and refresh the methods of using local materials such as Sevend we can approach to sustainable architecture in order to provide effective soloutions for contemporary constructions in this climatic zone.<\div>
نمایش نتایج ۱ تا ۲ از میان ۲ نتیجه