نتایج جستجو برای: cfd modeling

تعداد نتایج: 401752  

2007
Charles E. Cockrell John D. McMinn

A study was conducted to evaluate the potential effectiveness of a moveable cowl-trailing-edge design for airbreathing hypersonic single-stage-to-orbit (SSTO) configurations, which can be extended or deflected from the nominal position in order to provide additional pitching moment capability. This additional pitching moment capability may reduce the necessary deflection angle from conventional...

2016
Catherine Gorlé Asha Chigurupati Gianluca Iaccarino

An important fraction of the energy consumption in buildings is related to controlling the indoor temperature. In moderate climates passive cooling by nighttime ventilation can result in significant energy savings, but modeling natural ventilation systems for design and performance predictions remains a challenging task. We investigate the predictive capability of a box model and a CFD simulati...

Journal: :معماری و شهرسازی آرمان شهر 0
mohammadjavad mahdavinejad assistant professor, department of architecture, faculty of art and architecture, tarbiat modares university, tehran, iran. kavan javanroodi m. sc. in architecture, faculty of art and architecture, tarbiat modares university, tehran, iran.

characteristics of efficient roof shape is a part of configuration of efficient architecture which seems to be an ideal in contemporary architecture especially in contemporary architecture of developing countries such as iran. this study is to investigate two roof shapes in view of air flow and indoor-temperature to find efficient roofs shapes for residential buildings in tehran. computational ...

Journal: :Computer methods and programs in biomedicine 2015
Vitaly O. Kheyfets Lourdes Rios Triston Smith Theodore Schroeder Jeffrey Mueller Srinivas Murali David Lasorda Anthony Zikos Jennifer Spotti John J. Reilly Ender A. Finol

Computational fluid dynamics (CFD) modeling of the pulmonary vasculature has the potential to reveal continuum metrics associated with the hemodynamic stress acting on the vascular endothelium. It is widely accepted that the endothelium responds to flow-induced stress by releasing vasoactive substances that can dilate and constrict blood vessels locally. The objectives of this study are to exam...

2015
Ali Yıldız Necmettin Erbakan

Flow in the open channels has great importance in the hydraulic engineering. Any disturbances as contractions and expansions affect the flow characteristics like velocities, flow rates and water surface profiles. Their effects on the flow must be considered during the design process of flow structures. In the last decades numerical solutions become popular as experimental studies take time, may...

2013
S. Gilani H. Montazeri B. Blocken

Accurate and reliable CFD simulation of temperature stratification in indoor environment is needed for the design and evaluation of displacement ventilation in buildings. This paper presents a detailed and systematic evaluation of the capability of 3D steady RANS CFD simulations to predict the temperature stratification in a room. The evaluation is based on sensitivity analysis and validation w...

2006
V. SINGH S. SRIVASTAVA

The paper presents Design development of cement industry cyclone based on CFD along with pilot plant trials. Based on simulation of laboratory scale cyclone as expressed in literature and in-house pilot plant experiments, Reynolds stress model has been found to predict the turbulent flow field, pressure drop and particle collection efficiency closely as compared to other standard turbulence mod...

2016
Li Rong Bjarne Bjerg Guoqiang Zhang

This study investigates the effect of modeling the slatted floor as porous media on prediction of ammonia emissions and airflow patterns. Two approaches to determine the resistance coefficients of porous media modeling are adopted by using two geometries in CFD modeling. The results reveal that the ammonia emission with slatted floor modeled as actual size (SLM) is generally lower than the valu...

2003
Xiaoyi He Li - Shi Luo

In the last decade or so, the lattice Boltzmann (LB) method has emerged as a new and effective numerical technique of computational fluid dynamics (CFD).(1-5) Modeling of the incompressible Navier-Stokes equation is among many of its wide applications. Indeed, the lattice Boltzmann equation (LBE) was first proposed to simulate the incompressible NavierStokes equations.(1) The incompressible Nav...

2003
Lionel Mathelin M. Yousuff Hussaini Thomas A. Zang Françoise Bataille

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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