نتایج جستجو برای: مدلسازی cfd
تعداد نتایج: 25098 فیلتر نتایج به سال:
This paper describes a proposed best-practices system that will present expert knowledge in the use of CFD. The best-practices system will include specific guidelines to assist the user in problem definition, input preparation, grid generation, code selection, parameter specification, and results interpretation. The goal of the system is to assist all CFD users in obtaining high quality CFD sol...
دینامیک سیالات محاسباتی(cfd) ابزاری قدرتممند برای بررسی دقیق میدان جریان، درجه حرارت، غلظت و ... است. این روش مجموعه ای از فنون حل عددی معادلات حاکم بر پدیده های انتقال ممنتوم، حرارت و جرم درون سیالات است که با توسعه سیستم های سخت افزار و نرم افزار رایانه ها، قابلیت های فراوانی در آن ایجاد شده است. cfd با این قابلیت ها به یکی از روش های اصلی تحقیق و پژوهش در رشته های مختلف مهندسی تبدیل شده است....
استفاده از بستر سیال محترق در سال های اخیر افزایش قابل توجهی یافته است. این روش در قرن بیستم با احتراق ذغال سنگ یا فرایند تبخیرشوندگی آن آغاز شد. اخیرا احتراق سوخت های نوینی مانند زیست توده و پسماند جایگزین مناسبی برای ذغال سنگ در تولید توان شده است. موفقیت بستر سیال محترق در بازدهی احتراق بالا، امکان استفاده از سوخت های جامد متنوع با ارزش حرارتی متفاوت و همچنین کاهش آلودگی گازهای خروجی قابل تو...
A 1D3D–CFD coupled spray model is proposed in this work for the simulation of Diesel sprays under non-evaporative conditions and constant injection velocity in time. The basic idea of the model is to reduce the poor estimations of the gas velocity and droplets/gas relative velocity obtained with the standard 3D–CFD Eulerian–Lagrangian spray model, when coarse meshes are used. The coupling has b...
The main objective of the common DLR/ONERA project MIRACLE is to harmonize the CFD activities and strategies of DLR and ONERA in order to better fulfil the future requirements of transport aircraft industry in Europe. The paper presents the most significant achievements of the co-operative activities, which have been focused on the following objectives: collaborative enhancement and industriali...
This paper describes curtain airbag gas delivery system development work using CFD analysis. The objective of developing gas delivery system was to achieve uniform inflation and reasonable time to position for oblique pole test with 5 %ile female. CFD analysis has been conducted to design gas delivery system of 3 row curtain airbag. The gas delivery system consists of T-diffuser and flexible ga...
Using computational fluid dynamics (CFD) techniques to model buoyancy-driven airflows has always proved challenging. This work investigates CFD modelling of buoyancy-driven natural ventilation flows in a single-storey space connected to an atrium. The atrium is taller than the ventilated space and when warmed by internal heat gains producing a column of warm air in the atrium and connect space ...
The integration of building Energy Simulation (ES) and Computational Fluid Dynamics (CFD) programs eliminates many assumptions employed in the separate applications, resulting in more accurate predictions of building performance. This paper discusses the methods used to determine convective heat transfer on interior surfaces of building envelope, which is the key linkage between ES with CFD pro...
The lEC 534-8-4:1994 method of predicting audible noise external to a control valve (and inpipe noise levels) relies on the use of experimentally derived "valve specific" input parameters. This paper shows how Computational Fluid Dynamics (CFD) can be used as a too! to obtain these valve specific parameters w/ithout the need for experiment. Three types of 100mm throttling devices are modelled u...
This paper describes a fully spectral, Polynomial Chaos method for the propagation of uncertainty in numerical simulations of compressible, turbulent flow, as well as a novel stochastic collocation algorithm for the same application. The stochastic collocation method is key to the efficient use of stochastic methods on problems with complex nonlinearities, such as those associated with the turb...
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