نتایج جستجو برای: روش cfd

تعداد نتایج: 383489  

2011
Conrad Voelker Oliver Kornadt

When coupling computational fluid dynamics (CFD) with a detailed thermal comfort model describing the human thermoregulation, the characteristics of the micro-climate of the human body have to be known. In the paper, CFD has been applied to investigate human body’’s micro climate. A climate chamber equipped with a thermal manikin has been used to validate the CFD simulations against measurement...

2013
Dazhi SUN Jinpeng LV S. Travis WALLER

This paper introduces computational fluid dynamics (CFD), a numerical approach widely and successfully used in aerospace engineering, to deal with surface traffic flow related problems. After a brief introduction of the physical and mathematical foundations of CFD, this paper develops CFD implementation methodology for modeling traffic problems such as queue/platoon distribution, shockwave prop...

2008
Lisa M. Leslie Michele J. Gelfand

Although gender discrimination has been illegal in organizations since the passage of the Civil Right Act of 1964, individuals remain hesitant to claim internally by making members of their employing organization aware of gender discrimination. Yet surprisingly little research has examined the individual difference and contextual antecedents to internal discrimination claims. We advance an inte...

2017
Chen Qian Shaoqing Ju Jing Qi Jianmei Zhao Xianjuan Shen Rongrong Jing Juan Yu Li Li Yingjuan Shi Lurong Zhang Zhiwei Wang Hui Cong

Gastric cancer (GC) is the fourth most common cancer and the second major cause of cancer-related deaths worldwide. In our previous study, a novel and sensitive method for quantifying cell-free DNA (CFD) in human blood was established and tested for its ability to predict patients with tumor. We want to investigate CFD expression in the sera of GC patients in an attempt to explore the clinical ...

KATAPAK-S is a type of structured catalytic packing, which is used in reactive distillation processes. The dry pressure drop characteristic (the pressure drop in the absence of liquid flow) is of significant importance for the investigation of process hydrodynamics. In this paper, the dry pressure drop within the catalyst packed channels of KATAPAK-S has been investigated using Computational Fl...

این مقاله شامل بررسی و مقایسه روش‌های محاسبه ضریب انتقال حرارت جابجایی در محفظه احتراق و نازل همگرا-واگرا می‌باشد. به این منظور، ابتدا تاریخچه‌ای از روش‌های مختلف محاسبه ضریب انتقال حرارت جابجایی بیان شده، سپس جریان داخلی نازل به روش صریح مک-کورمک حل شده است. روش‌های بارتز، استانتون، پریکسورن و آدمی در بین روش‌های مطرح این حوزه، انتخاب شده و با روش CFD در نازل باتس (BATES) مقایسه شده است. در اد...

ژورنال: :فصلنامه علمی ترویجی فرآیند نو 2015
علیرضا میراولیایی فرهاد شهرکی

در این تحقیق رفتار سیال در یک بستر پرشده ثابت با نسبت قطر لوله به قطر ذره برابر 6/4 با استفاده از دینامیک سیالات محاسباتی بررسی شد. هندسه بستر با استفاده از روش پرکن گسسته مدل شد. شبیه سازی های cfd در گستره عدد رینولدز 79/611-85/3 در رژیم جریان آرام و آشفته انجام شدند. در رژیم جریان آشفته از مدل آشفتگی rng k-ε استفاده شد. مشاهده شد که جریان سیال در فاصله 75/0 سانتیمتر از ابتدای بستر توسعه یافته...

Journal: :CoRR 2016
Chaoyang Jiang Yeng Chai Soh Hua Li Mustafa K. Masood Zhe Wei Xiaoli Zhou Deqing Zhai

Current CFD calibration work has mainly focused on the CFD model calibration. However no known work has considered the calibration of the CFD results. In this paper, we take inspiration from the image editing problem to develop a methodology to calibrate CFD simulation results based on sparse sensor observations. We formulate the calibration of CFD results as an optimization problem. The cost f...

2017
Yasuyuki Umeda Fujimaro Ishida Masanori Tsuji Kazuhiro Furukawa Masato Shiba Ryuta Yasuda Naoki Toma Hiroshi Sakaida Hidenori Suzuki

OBJECTIVE This study aimed to predict recurrence after coil embolization of unruptured cerebral aneurysms with computational fluid dynamics (CFD) using porous media modeling (porous media CFD). METHOD A total of 37 unruptured cerebral aneurysms treated with coiling were analyzed using follow-up angiograms, simulated CFD prior to coiling (control CFD), and porous media CFD. Coiled aneurysms we...

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