Journal articles: 'CFD program'

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Agonafer, D., and A. Vimba. "Solid Model Based Preprocessor to CFD Code for Applications to Electronic Cooling Systems." Journal of Electronic Packaging 119, no. 2 (June 1, 1997): 138–43. http://dx.doi.org/10.1115/1.2792220.

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The use of a solid model based Computer Aided Design (CAD) tool as a preprocessor to a finite control-volume based Computational Fluid Dynamics (CFD) code is presented. Preprocessing includes geometry description, grid generation, definition of material properties, application of boundary conditions, and definition of solution control parameters. The CAD based preprocessor, as opposed to traditional finite control-volume preprocessors, provides the above capabilities in a powerful graphic environment. Using a solid model based CAD tool, work is reduced, and visualization is enhanced employing the capabilities of the three-dimensional solid modeler. In addition, a technique which categorizes control volumes into groups comprising the solid and fluid portions of the problem domain is presented. At the completion of preprocessing, a model appropriate as input to a CFD code is generated. This model is then solved using the CFD program. The process is shown in a tutorial form by considering a two-dimensional turbulent flow problem in an electronic card on board package. Although the methodology shown in this paper focuses on specific CFD and Solid Model programs, the concept can readily be applied to other CFD and/or Solid Model programs.

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Копылов, Юрий, Yuriy Kopylov, Александр Федулин, Aleksandr Fedulin, Олег Афанасьев, and Oleg Afanasev. "«The roads of Power’s soul»: project of development of autotransport infrastructure and of roadside service in the Central Federal District." Service & Tourism: Current Challenges 9, no. 3 (September 4, 2015): 49–60. http://dx.doi.org/10.12737/12882.

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The development Program project of road transport and tourism infrastructure «The roads of Power´s Soul» is presented in the article. The program was developed by the Coordinating Council for the development of tourism in the Central Federal District (CFD) of the Association of interregional social and economic interaction «Central Federal District» and the Russian State University of Tourism and Service. The urgency of the creation of generalizing, integral tourism and tourist services development programs for all regions of the CFD is justified in the article. It was noted that tourism is the rapidly growing sector of the economy CFD. But comprehensive solution of issues related to creation of the new tourism products cannot be provided by the only development of the infrastructure. This hinders the development of effective promotion tools, introduction of innovative technologies, staff training in the tourism and service of district. The creation of a unified tourism space is the one of the main directions of the tourism sector development in the Central Federal District. Such approach can only be implemented within a unified inter-regional program of tourism development in district and creating a tourist cluster with the active participation of each subject of the CFD. The program development project of road transport and tourism infrastructure in 2015 - 2025 is proposed in the article. The goals, objectives, stages, outcomes of the program are defined. The scheme of the complex federal automobile segmented tourist ring route through the territory of all the regions - subjects of the CFD is proposed. The main results of a comprehensive analysis of tourist routs, facilities and activities recommended for inclusion in the program are rep- resented. The criteria for selection of destinations and also companies and organizations of tourism infrastructure for inclusion in the Program are substantiated. It is concluded that practical implementation of developed Program is very important; it might be very effective for the tourism development in the Central Federal District and Russia as a whole.

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Thilmany, Jean. "How Does Your Fluid Flow?" Mechanical Engineering 125, no. 12 (December 1, 2003): 35–37. http://dx.doi.org/10.1115/1.2003-dec-3.

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This article reviews the method of analyzing fluid flow in structures and designs, which is enjoying a burst of interest. Twenty years later, manufacturers across a myriad of industries are licensing the technology from a pool of vendors who now market computational fluid dynamics (CFD) packages of many stripes. Engineers use CFD to predict how fluids will flow and to predict the quantitative effects of the fluid on the solids with which they are in contact. Airflow is commonly studied with the software. Many mechanical engineers do not need access to all the bells and whistles an advanced CFD program can provide. Advanced analysis programs are usually the purview of a user trained on a particular CFD package. Engineers used CFD to determine how to best position the fans so that air flowed inside the refrigerator and the freezer in the most efficient way. After studying fluid flow simulations, they made prototypes of the most promising modeled designs to see if the prototypes matched CFD simulation results.

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Zheng, Jian, Chang Sheng Zhou, and Xiong Chen. "The Application of MATLAB in Computational Fluid Dynamic Visualization Processing." Applied Mechanics and Materials 117-119 (October 2011): 619–23. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.619.

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Computational fluid dynamics (CFD) is an important applied research area of scientific computation visualization. Aiming at the difficult for three-dimensional display in the post-processing of wrap-around fins’ flowfield with commercial CFD software, the visualization techniques of CFD were investigated. And a visualization program was compiled using by powerful graphic processing software of MATLAB. The results showed the visualization program can display three-dimension characteristic of pressure, temperature etc. on the surface of wrap-around fins accurately and visually.

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MORIMOTO, Kenta, and Yuichi ITOH. "Development of education program for mechanical design support by CAE/CFD." International Conference on Business & Technology Transfer 2012.6 (2012): 120–25. http://dx.doi.org/10.1299/jsmeicbtt.2012.6.0_120.

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Herfjord, K., S. O. Drange, and T. Kvamsdal. "Assessment of Vortex-Induced Vibrations on Deepwater Risers by Considering Fluid-Structure Interaction." Journal of Offshore Mechanics and Arctic Engineering 121, no. 4 (November 1, 1999): 207–12. http://dx.doi.org/10.1115/1.2829569.

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A methodology for computing vortex-induced vibrations (VIV) on risers is presented. It is based on computation of the flow by a CFD program, structural dynamics by a nonlinear structural (CSD) code, and a coupling between them. The CFD computations are performed in 2-D at a number of sections along the riser. The load is imposed on the riser in a strip theory manner. The coupling between the CFD planes takes place through the response of the riser. The local deformation of the riser is taken into account by the CFD program, thus completing a fluid-structure interaction loop each time step. The methodology is validated by comparing results from simulations with results from model tests.

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Kasriman, Kasriman. "MOTIVASI MASYARAKAT MELAKUKAN OLAHRAGA REKREASI MELALUI PROGRAM CAR FREE DAY DI JAKARTA." JURNAL PENDIDIKAN JASMANI DAN OLAHRAGA 2, no. 2 (September 17, 2017): 72. http://dx.doi.org/10.17509/jpjo.v2i2.8183.

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Kegiatan masyarakat dalam hal melakukan olahraga rekreasi saat ini masih sangatlah kurang. Selain faktor kesadaran akan pentingnya olahraga yang berasal dari dalam diri sendiri, faktor lain yang menghambat masyarakat untuk melakukan olahraga rekreasi adalah mengenai sarana dan prasarana yang tersedia untuk mendukung kegiatan tersebut. Tujuan dari penelitian ini adalah untuk mengetahui motivasi masyarakat melakukan olahraga rekreasi melalui program Car Free Day (CFD) di Jakarta pada tahun 2017. Pendekatan penelitian yang digunakan peneliti yaitu dengan pendekatanpenelitian kualitatif dan kuantitatif. Lokasi penelitian ini yaitu di sekitar jalan Sudirman – Thamrin Jakarta. Sasaran dalam penelitian ini yaitu masyarakat dengan batasan usia 15 tahun - 50 tahun yang mengikuti CFD, kemudian diambil sampel sejumlah 100 orang. Dalam penelitian ini, instrumen yang digunakan adalah dengan angket. Adapun yang menjadi indikator variabel motivasi adalah 1) intrinsik yang dijabarkan dalam sub indikator: a) olahraga, b) menjaga kesehatan, c) refreshing, d) menghilangkan kejenuhan, 2) ekstrinsik yang dijabarkan dalam sub indikator: a) teman, b) lokasi, c) biaya, d) cuaca, e) peran pemerintah. Analisis deskriptif yang digunakan adalah analisis deskriptif persentase. Hasil penelitian menyimpulkan motivasi masyarakat terhadap olahraga rekreasi melalui CFD di Jalan Sudirman Jakarta memiliki persentase sebesar 52% berada di atas harga rata-rata, sehingga dapat disimpulkan bahwa motivasi masyarakat terhadap olahraga rekreasi melalui CFD di Jalan Sudirman Jakarta cukup tinggi.

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Khoo, Chris, Nico Schulenkorf, and Daryl Adair. "The benefits and limitations of using cricket as a sport for development tool in Samoa." Cosmopolitan Civil Societies: An Interdisciplinary Journal 6, no. 1 (September 9, 2014): 76–102. http://dx.doi.org/10.5130/ccs.v6i1.3737.

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This study investigates benefits and challenges associated with the use of sport – in this case cricket – as a community development tool in Samoa. This Pacific Island nation, like others in the region, has been the focus of various development programs in the post-colonial era, with developed economy neighbours like Australia and New Zealand providing aid funding. Some of that has involved sport as a development tool, underpinned either by funding from the national government, foreign aid agencies, or a combination of both. The present paper, by focusing on a cricket for development (CFD) program in Samoa, aims to explore outcomes and limitations associated with the use of sport as a community engagement tool. The paper pursues that goal by examining the activities of relevant sport and government organisations, and – most crucially – it interviews key stakeholders involved in the CFD process in Samoa. In short, the prime purpose of this paper is to identify and interpret – from the perspective of locals – whether the CFD program has brought benefits to Samoan communities, and the challenges and limitations they see thus far. This is important because, to date, there has been an absence of qualitative inquiry into the efficacy of sport for development (SFD) programs in Samoa, and very limited research in a Pacific Islands context.

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Thilmany, Jean. "Ask the Supercomputer." Mechanical Engineering 128, no. 04 (April 1, 2006): 36–38. http://dx.doi.org/10.1115/1.2006-apr-3.

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This paper analyzes research work on developing techniques to study complex fluids. Although several computational fluid dynamics (CFD) vendors now sell desktop software that mechanical engineers can buy to model complex flows, many problems are still simply too hard for those applications. According to engineers, CFD programs for these complex problems can take years to write, even with the supercomputer's aid. Moreover, some flows may never be modeled: they are just too complex for even the most advanced software. Behr and a colleague, Matteo Pasquali, an Associate Professor in the Department of Chemical and Biomolecular Engineering at Rice University, are now at work writing a CFD application that will help a heart-pump manufacturer analyze how blood would move through different configurations of the pump. Pasquali and Behr spent two years trying to turn the pump geometry and performance data Baylor provided into usable data. They converted the pump's computer-aided design information and input it into their homegrown CFD program, then came up with software tools to rotate one part of the computationally meshed pump element with respect to another.

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Xing, Yan Ying. "Approach on Pollution Gases Diffusion Path of Small Spacing Tunnel Entrance Based on CFD." Applied Mechanics and Materials 580-583 (July 2014): 1254–57. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.1254.

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Small spacing tunnel due to the special structure form and two tubes are only separated by a thin wall. This structure form is likely to cause secondary pollution, pollution gas discharged into the adjacent tunnel. This phenomenon will lead to increased ventilation system energy consumption. This paper analysis gas diffusion path between two adjacent tunnels, using CFD (Ansys Fluent). To relieve the pollution gases secondary pollution of tunnel portal area, using CFD analyzed gas diffusion path under different circumstances, for opening hole on the top of sunshades, extended of the wall between two adjacent tunnels and other programs, and identify more comprehensive disposal program.

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Dmitriev, S. M., A. E. Khrobostov, A. A. Barinov, and V. G. Glavny. "DEVELOPMENT AND ADAPTATION OF VORTEX REALIZABLE MEASUREMENT SYSTEM FOR BENCHMARK TEST WITH LARGE SCALE MODEL OF NUCLEAR REACTOR." Devices and Methods of Measurements 8, no. 3 (September 27, 2017): 203–13. http://dx.doi.org/10.21122/2220-9506-2017-8-3-203-213.

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The last decades development of applied calculation methods of nuclear reactor thermal and hydraulic processes are marked by the rapid growth of the High Performance Computing (HPC), which contribute to the active introduction of Computational Fluid Dynamics (CFD). The use of such programs to justify technical and economic parameters and especially the safety of nuclear reactors requires comprehensive verification of mathematical models and CFD programs. The aim of the work was the development and adaptation of a measuring system having the characteristics necessary for its application in the verification test (experimental) facility. It’s main objective is to study the processes of coolant flow mixing with different physical properties (for example, the concentration of dissolved impurities) inside a large-scale reactor model. The basic method used for registration of the spatial concentration field in the mixing area is the method of spatial conductometry. In the course of the work, a measurement complex, including spatial conductometric sensors, a system of secondary converters and software, was created. Methods of calibration and normalization of measurement results are developed. Averaged concentration fields, nonstationary realizations of the measured local conductivity were obtained during the first experimental series, spectral and statistical analysis of the realizations were carried out.The acquired data are compared with pretest CFD-calculations performed in the ANSYS CFX program. A joint analysis of the obtained results made it possible to identify the main regularities of the process under study, and to demonstrate the capabilities of the designed measuring system to receive the experimental data of the «CFD-quality» required for verification.The carried out adaptation of spatial sensors allows to conduct a more extensive program of experimental tests, on the basis of which a databank and necessary generalizations will be created. The received information allows to answer a number of questions related to scaling up the results of CFD calculations at the fullscale parameters of pressurized nuclear reactors.

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Cao, Wei, Chuan Fu Xu, and Zheng Hua Wang. "Heterogeneous Computing for a CFD Solver on GPU/CPU Computer." Advanced Materials Research 791-793 (September 2013): 1252–55. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1252.

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The high-order schemes have attracted more and more attention in computational fluid dynamics (CFD) simulations. As a kind of high-order schemes, weighted compact nonlinear schemes (WCNSs) have been widely applied. In recent years, the highly parallel graphics processing unit (GPU) is rapidly gaining maturity as a powerful engine for high performance computer. This paper studies the heterogeneous parallel computation and implementation of a high-order CFD program on Tianhe-1A supercomputer system. The CFD program is intended for the solution of the Navier-Stokes equations on multi-block Cartesian meshes for aerodynamics research. The solver utilizes the high-order WCNS scheme for space discretization and Jacobi iteration method for time discretization. The performance analyses show that the single-GPU solver achieves about 8× speed-ups relative to a serial computation on a CPU core.

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Hasmi, Abrari Noor, Samsu Dlukha Nurcholik, Samsu Dlukha Nurcholik, Muhammad Budi Prasetyo, Muhammad Budi Prasetyo, Alamsyah Alamsyah, Alamsyah Alamsyah, Thorikul Huda, and Thorikul Huda. "Tinjauan Hambatan pada Rancangan Kapal Tongkang Tanpa Awak Menggunakan Metode Computational Fluid Dynamics - OpenFOAM." INOVTEK POLBENG 9, no. 2 (November 28, 2019): 382. http://dx.doi.org/10.35314/ip.v9i2.1151.

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Di Indonesia, proses pengiriman batubara dengan kapal tongkang banyak dijumpai karena kemudahan aksesnya dimana kapal tongkang memiliki sarat air (draft) yang lebih kecil dibandingkan dengan jenis kapal lain. Penelitian ini mencoba menentukan hambatan pada kapal tanpa awak berbentuk kapal tongkang untuk beberapa kecepatan menggunakan metode CFD dengan program OpenFOAM. Metode ini mendiskritisasi persamaan Navier Stokes dengan menggunakan pendekatan metode volume hingga. Kapal tongkang digambar menggunakan perangkat lunak Maxsurf modeler sebelum diintegrasikan kedalam program CFD. Diskritisasi dilakukan dengan memastikan area sekitar lambung kapal terdiskritisasi cukup rapat. Hasil penelitian menunjukan bahwa Hambatan pada kapal tongkang berkisar antara 39.39kN-227.963kN untuk kecepatan 3-9knot.

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Turner, M. T., J. W. Chew, and C. A. Long. "Experimental Investigation and Mathematical Modeling of Clearance Brush Seals." Journal of Engineering for Gas Turbines and Power 120, no. 3 (July 1, 1998): 573–79. http://dx.doi.org/10.1115/1.2818185.

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In this paper, an experimental program and a CFD based mathematical model using a brush seal at two bristle to rotor clearances (0.27 mm and 0.75 mm) are presented. The experimental program examined the radial pressure distributions along the backing ring, the axial pressure distribution along the rotor, and the mass flow through the seal through a range of pressure ratios while exhausting to atmosphere. The results from this experimental program have been used to further calibrate a CFD-based model. This model treats the bristle pack as an axisymmetric, anisotropic porous region, and is calibrated by the definition of nonlinear resistance coefficients in three orthogonal directions. The CFD analysis calculates the aerodynamic forces on the bristles, which are subsequently used in a separate program to estimate the bristle movements, stresses, and bristle and rotor loads. The analysis shows that a brush seal with a build clearance produces a very different flow field within the bristle pack to one with an interference, and the need to understand the bulk movements of the bristles. These are shown to be affected by the level of friction between the bristles and the backing ring, which has an important effect on the bristles wear and seal leakage characteristics.

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Siow, C. L., Jaswar, and Efi Afrizal. "Computational Fluid Dynamic Using Parallel Loop of Multi-Cores Processor." Applied Mechanics and Materials 493 (January 2014): 80–85. http://dx.doi.org/10.4028/www.scientific.net/amm.493.80.

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Computational Fluid Dynamics (CFD) software is often used to study fluid flow and structures motion in fluids. The CFD normally requires large size of arrays and computer memory and then caused long execution time. However, Innovation of computer hardware such as multi-cores processor provides an alternative solution to improve this programming performance. This paper discussed loop parallelize multi-cores processor for optimization of sequential looping CFD code. This loop parallelize CFD was achieved by applying multi-tasking or multi-threading code into the original CFD code which was developed by one of the authors. The CFD code was developed based on Reynolds Average Navier-Stokes (RANS) method. The new CFD code program was developed using Microsoft Visual Basic (VB) programming language. In the early stage, the whole CFD code was constructed in a sequential flow before it is modified to parallel flow by using VBs multi-threading library. In the comparison, fluid flow around the hull of round-shaped FPSO was selected to compare the performance of both the programming codes. Besides, executed results of this self-developed code such as pressure distribution around the hull were also presented in this paper.

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Parker, Kevin. "Fixing a Boiler with CFD." Mechanical Engineering 120, no. 04 (April 1, 1998): 59–61. http://dx.doi.org/10.1115/1.1998-apr-2.

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This article focuses on carryover at a paper mill that had been solved using computational fluid dynamics (CFD) to visualize flow within the boiler. Technicians had tried adjusting airflow and firing arrangements without success. They turned the problem over to analysts who simulated the airflow within the boiler using CFD. An animated sequence of streamlines showing airflow provided engineers with a clear understanding of exactly what was happening inside the boiler, making it relatively easy to adjust operating conditions and solve the problem. McDermott analysts use FIELDVIEW, a commercial post-processing program from Intelligent Light in Lyndhurst, NJ. With the software, the analyst can create three-dimensional perspective views with hidden-line removal and light shading. She or He can trace the path of a marker traveling along with the fluid through a series of animated views. The analysts made a second FIELDVIEW movie of the airflow conditions with the new arrangement, showing the elimination of the center core. They played the two movies simultaneously on two monitors set side-by-side to demonstrate for the customer’s engineers how the recommended changes would solve the problem.

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Sun, Jianglong, Haiwen Tu, Yongnian Chen, De Xie, and Jiajian Zhou. "A Study on Trim Optimization for a Container Ship Based on Effects due to Resistance." Journal of Ship Research 60, no. 01 (March 1, 2016): 30–47. http://dx.doi.org/10.5957/jsr.2016.60.1.30.

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The objective of this paper is to perform trim optimization on a 4250-TEU container ship based on the influence of trim on the resistance by using computational fluid dynamics (CFD) in conjunction with towing tank tests. First, the International Towing Tank Conference (ITTC) procedures were applied to uncertainty analysis of CFD and the CFD procedure was further verified and validated through three representative resistance curves obtained by the tests. Next, a series of resistance curves in different conditions with varied drafts and trims were obtained by the CFD computations for the model to provide data source to analyze the influence of the trim on the resistance. Results indicate that the variation of wave-making resistance due to trim dominates that of the total resistance. Finally, the resistance data for the model were converted to the engine power of the real ship. At each speed, the response surface of engine power with respect to drafts and trims was constructed and thus a trim optimization program was developed. The real ship operated under the instruction of the trim optimization program can save energy and reduce emissions significantly.

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Cenko, A. "One CFD calculation to end point flight testing: (Has CFD finally replaced the wind tunnel?)." Aeronautical Journal 110, no. 1109 (July 2006): 439–46. http://dx.doi.org/10.1017/s0001924000001330.

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Abstract Any time a new aircraft is introduced into service, or an old aircraft undergoes substantial modifications or needs to be certified to carry and employ new stores, the store separation engineer is faced with a decision about how much effort will be required to provide an airworthiness certification for the aircraft and stores. Generally, there are three approaches that have been used: wind-tunnel testing, computational fluid dynamics (CFD) analyses and flight testing. During the past twenty years there have been considerable advances in all three areas. In particular, there has been a considerable improvement in the speed and validity of CFD results for store separation. The Holy Grail of CFD has long been the reduction/replacement of wind-tunnel testing. This would mean in store separation the ability to go from a CFD calculation to flight testing at the end point. The paper will describe how this was achieved for the F/A-18C/Litening pod program.

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Gai, Ao. "Improving Aerodynamic Efficiency and Decreasing Drag Coefficient of an F1 in Schools Race Car." Modern Applied Science 15, no. 2 (March 29, 2021): 73. http://dx.doi.org/10.5539/mas.v15n2p73.

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To improve the aerodynamic efficiency of a Formula One (F1) in Schools race car, the original model of the car is evaluated and compared with a new design. The ideas behind the new design are supported by research about aerodynamics. Different potential designs are created with CAD software Fusion 360 and evaluated within CFD software Solid Edge 2020 with FloEFD. Empirical data shows how specific changes to the structure of race cars can improve aerodynamic efficiency by decreasing their aerodynamic drag. The experimental data and methods of this study can provide help and guidance for teenagers participating in the F1 in Schools competition program to solve the aerodynamic performance problems of racing cars and thereby increase youth interest in STEM programs, as well as their opportunities to learn about engineering and enter engineering careers.

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Brozowski, L. A., T. V. Ferguson, and L. Rojas. "Impeller Flow Field Laser Velocimeter Measurements." International Journal of Rotating Machinery 2, no. 3 (1996): 149–59. http://dx.doi.org/10.1155/s1023621x96000024.

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Development of Computational Fluid Dynamics (CFD) computer codes for complex turbomachinery affords a complete three-dimensional (3-D) flow field description. While significant improvements in CFD have been made due to improvements in computers, numerical algorithms, and physical modeling, a limited experimental database for pump CFD code validation exists.Under contract (NAS8-38864) to the National Aeronautics and Space Administration (NASA) at Marshall Space Flight Center (MSFC) a test program was undertaken at Rocketdyne to obtain benchmark data for typical rocket engine pump geometry. Nonintrusive velocity data were obtained with a laser two-focus velocimeter. Extensive laser surveys at the inlet and discharge of a Rocketdyne-designed impeller were performed. Static pressures were measured at key locations to provide boundary conditions for CFD code validation.

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Nekhamin, M. M., and D. L. Bondzyk. "COMBUSTION SPEED PARAMETERS WHEN SIMULATING BY ANSYS FLUENT PROGRAM OF SOLID FUEL COMBUSTION." Energy Technologies & Resource Saving, no. 1 (March 20, 2020): 41–45. http://dx.doi.org/10.33070/etars.1.2020.5.

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The existing difference in the models used to describe the burning rate of solid fuel particles, and, accordingly, the difference in the constants appearing in them, determines the relevance of the formulation of the relation between the constants known from the literature and the parameters that must be set in programs for CFD modeling of heat and power processes. This, in particular, relates to modeling the combustion of solid fuels in the well-known program ANSYS FLUENT. The paper outlines a possible approach to solving this problem. Bibl. 5, Fig. 3.

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Bestion, D., H. Anglart, D. Caraghiaur, P. Péturaud, B. Smith, M. Andreani, B. Niceno, et al. "Review of Available Data for Validation of Nuresim Two-Phase CFD Software Applied to CHF Investigations." Science and Technology of Nuclear Installations 2009 (2009): 1–14. http://dx.doi.org/10.1155/2009/214512.

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The NURESIM Project of the 6th European Framework Program initiated the development of a new-generation common European Standard Software Platform for nuclear reactor simulation. The thermal-hydraulic subproject aims at improving the understanding and the predictive capabilities of the simulation tools for key two-phase flow thermal-hydraulic processes such as the critical heat flux (CHF). As part of a multi-scale analysis of reactor thermal-hydraulics, a two-phase CFD tool is developed to allow zooming on local processes. Current industrial methods for CHF mainly use the sub-channel analysis and empirical CHF correlations based on large scale experiments having the real geometry of a reactor assembly. Two-phase CFD is used here for understanding some boiling flow processes, for helping new fuel assembly design, and for developing better CHF predictions in both PWR and BWR. This paper presents a review of experimental data which can be used for validation of the two-phase CFD application to CHF investigations. The phenomenology of DNB and Dry-Out are detailed identifying all basic flow processes which require a specific modeling in CFD tool. The resulting modeling program of work is given and the current state-of-the-art of the modeling within the NURESIM project is presented.

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Tuzharov, K., S. Iliev, V. Vilag, and J. Vilag. "Investigation of an axial hydrokinetic turbine with the CFD program Flow Simulation." IOP Conference Series: Materials Science and Engineering 1009 (January 16, 2021): 012058. http://dx.doi.org/10.1088/1757-899x/1009/1/012058.

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Madej, Jerzy, and Bartłomiej Będkowski. "AIR FLOW ANALYSIS FOR ELECTRICAL MOTOR'S COOLING SYSTEM WITH AUTODESK SIMULATION CFD 2013 PROGRAM." Acta Mechanica et Automatica 7, no. 2 (June 1, 2013): 89–92. http://dx.doi.org/10.2478/ama-2013-0016.

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Abstract In the article the analysis of airflow through electrical motor was conducted and optimal design solution was chosen in order to increase cooling efficiency. Numerical simulations allow to determine the areas of temperature occurrence which may have destructive influence on electrical motor parts and on its safe operation. The numerical calculations of airflow was carried out for two different types of fans as well as for two different housings. An analysis of the construction was carried out by CFD method using Autodesk Simulation CFD 2013. Community results of the analysis, we can conclude that the better solution for machines with fixed direction of rotation is to use instead of the radial the axial fan. For axial fan the motor temperature in the same condition was lower by about 5°C.

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Wei, Ying, and Feng Sha. "Running OpenFOAM in High Performance Computer." Applied Mechanics and Materials 380-384 (August 2013): 1924–26. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.1924.

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In this article We analysis the CFD software named OpenFOAM and detailed testing its performance on high-performance computer, and we do analysis the results which provide a valid reference to the engineers. so there will be another choose of CFD software. We built a high performance computer to experiment the parallel performance of OpenFOAM with standard program, and the way we built the high performance computer also useful to the engineers.

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Lu, Yi Ping, Zi Cheng Jin, Jia De Han, Bo Huang, and Guang Ping Hao. "Analysis of a New Ventilation Flow Filed of Ultraviolet Cross-Linking Irradiation Box." Applied Mechanics and Materials 427-429 (September 2013): 285–88. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.285.

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In order to improve the cooling effect of cable ultraviolet cross-linking irradiation box, the structure of spreader plate, reflector and outlet were improved. Then the 3D solid model of the irradiation box was established and the numerical simulation of turbulent flow field was performed due to the principle of Computational Fluid Dynamics (CFD). On this basis, the flow fields characteristics inside the irradiation box of original and improve programs were analyzed. The results showed that volume air flow of the new program increased by 36.6% and air velocity around the mercury lamp and XLPE cable surface was increased, so the better cooling effect can be achieved in the new program.

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Wood, M. G., P. F. Greenfield, T. Howes, M. R. Johns, and J. Keller. "Computational fluid dynamic modelling of wastewater ponds to improve design." Water Science and Technology 31, no. 12 (June 1, 1995): 111–18. http://dx.doi.org/10.2166/wst.1995.0470.

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Wastewater ponds are a popular treatment alternative in Australia, especially in the meat industry. However, increasingly stringent Australian environmental legislation is raising questions about the continued viability of ponds. Traditional design methods do not address the hydrodynamic problems (i.e. short-circuiting) nor can they predict the effects of measures like baffles or repositioning inlets or outlets to improve performance. This is because the microscale interactions between the fluid and solids, and the biological reactions are ignored. This paper presents a tool -- computational fluid dynamic (CFD) modelling and explores its potential as a new design tool for wastewater ponds. FIDAP, a finite element CFD program, is one of the new generation of commercial CFD packages available. This program has been used to qualitatively investigate the hydrodynamics of four pond systems. These models are limited to 2-dimensional (D), steady-state simulations in a laminar flow regime. They form the first step in the process to address the microscale fluid flow, mixing and biology in wastewater ponds. Considerably more modelling and validation work is yet to be done.

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Kim, Hyoung Tae, and Bo Wook Rhee. "Scaled-Down Moderator Circulation Test Facility at Korea Atomic Energy Research Institute." Science and Technology of Nuclear Installations 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/5903602.

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Korea Atomic Energy Research Institute (KAERI) started the experimental research on moderator circulation as one of a the national research and development programs from 2012. This research program includes the construction of the moderator circulation test (MCT) facility, production of the validation data for self-reliant computational fluid dynamics (CFD) tools, and development of optical measurement system using the particle image velocimetry (PIV). In the present paper we introduce the scaling analysis performed to extend the scaling criteria suitable for reproducing thermal-hydraulic phenomena in a scaled-down CANDU- (CANada Deuterium Uranium-) 6 moderator tank, a manufacturing status of the 1/4 scale moderator tank. Also, preliminary CFD analysis results for the full-size and scaled-down moderator tanks are carried out to check whether the moderator flow and temperature patterns of both the full-size reactor and scaled-down facility are identical.

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Zelenský, Petr, Martin Barták, Vojtìch Zavøel, Vladimír Zmrhal, and Radislav Krupa. "Numerical Analysis of Air Flow in a Modular Fan Unit Using CFD Simulation." E3S Web of Conferences 111 (2019): 01008. http://dx.doi.org/10.1051/e3sconf/201911101008.

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The current regulation of European Commission No. 1253/2014 regarding Ecodesing requirements for ventilation units, which classified them based on the Specific Fan Power (SFP), has been driving the innovation in the sector of air-handling systems. The required energy saving can be met by applying modern and energy efficient Electronically Commutated (EC) motor which, at the same time, significantly change the internal geometry of the fan unit. The paper deals with design of a new type of modular fan unit ALTEKO Alton with EC motor and unhoused backward curved impeller. The design development and optimization of the fan unit leading to the reduction of generated aerodynamic noise, lower pressure loss and better outflow characteristics is supported by the Computational Fluid Dynamic (CFD) simulations, which enables visualization of air streamlines, velocities and pressure contours within the unit. Such a design is an iterative process between CFD specialist and construction team, where, based on the simulated results, the critical spots are identified, the geometry is improved and again verified throughout the CFD simulation. The paper describes in detail the individual steps of the optimization study, starting with the import of the detailed geometry from the design CAD software and its necessary simplification for the use in the CFD study, meshing of the model and consequent simulation. The methods of the fan rotation approximation are discussed as well. Additionally, the optimum position of heat exchanger in front of the fan unit is addressed. The presented work is a part of a project supported by the EU under the Operational Program Enterprise and Innovation for Competitiveness.

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Kuczyński, Paweł, and Ryszard Białecki. "Radiation heat transfer model using Monte Carlo ray tracing method on hierarchical ortho-Cartesian meshes and non-uniform rational basis spline surfaces for description of boundaries." Archives of Thermodynamics 35, no. 2 (June 1, 2014): 65–92. http://dx.doi.org/10.2478/aoter-2014-0014.

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Abstract The paper deals with a solution of radiation heat transfer problems in enclosures filled with nonparticipating medium using ray tracing on hierarchical ortho-Cartesian meshes. The idea behind the approach is that radiative heat transfer problems can be solved on much coarser grids than their counterparts from computational fluid dynamics (CFD). The resulting code is designed as an add-on to OpenFOAM, an open-source CFD program. Ortho-Cartesian mesh involving boundary elements is created based upon CFD mesh. Parametric non-uniform rational basis spline (NURBS) surfaces are used to define boundaries of the enclosure, allowing for dealing with domains of complex shapes. Algorithm for determining random, uniformly distributed locations of rays leaving NURBS surfaces is described. The paper presents results of test cases assuming gray diffusive walls. In the current version of the model the radiation is not absorbed within gases. However, the ultimate aim of the work is to upgrade the functionality of the model, to problems in absorbing, emitting and scattering medium projecting iteratively the results of radiative analysis on CFD mesh and CFD solution on radiative mesh.

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Blasiak, Slawomir, Pawel Andrzej Laski, and Jakub Emanuel Takosoglu. "Rapid Prototyping of Pneumatic Directional Control Valves." Polymers 13, no. 9 (April 30, 2021): 1458. http://dx.doi.org/10.3390/polym13091458.

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The main objective of the study was to design a pneumatic directional control valve for controlling pneumatic drives and produce it using a rapid prototyping technique. As the basic design assumption was to achieve high performance through a high flow rate and a low pressure drop, it was necessary to determine two flow parameters: the sonic conductance and the critical pressure ratio. The flow rate of compressed air and the diameters of the pneumatic conduits and fittings are important as they affect the rate of travel of the pneumatic cylinder piston. The 3D solid model of the directional control valve, developed in a CAD program, was used to simulate and optimize the flow rate. The analysis was performed by means of ANSYS CFX, a computational flow dynamics program. The main elements of the valve, i.e., the spool and the body, were produced using the PolyJet Matrix technology. The prototype was tested experimentally to determine the nominal flow-rate, calculate the flow parameters in accordance with the ISO 6358-1989 standard and compare them with the CFD simulation data. The simulation results showed very good agreement with the measurement data. The CFD analysis of the 3D solid model enabled us to optimize the flow of compressed air through the valve. The rapid prototyping method was found to be suitable to produce a fully functional directional control valve, which was confirmed through measurements at a test stand. The attempt to combine rapid prototyping used to fabricate pneumatic directional control valves with CFD used to simulate their operation was successful. The study shows that it is possible to design and construct a fully functional directional control valve characterized by high efficiency, high performance and a small pressure loss in a very short time and at a very low cost, which makes rapid prototyping superior to conventional methods of prototype making.

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Orszulik, Magdalena, Adam Fic, and Tomasz Bury. "CFD modeling of passive autocatalytic recombiners." Nukleonika 60, no. 2 (June 1, 2015): 347–53. http://dx.doi.org/10.1515/nuka-2015-0050.

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Abstract This study deals with numerical modeling of passive autocatalytic hydrogen recombiners (PARs). Such devices are installed within containments of many nuclear reactors in order to remove hydrogen and convert it to steam. The main purpose of this work is to develop a numerical model of passive autocatalytic recombiner (PAR) using the commercial computational fluid dynamics (CFD) software ANSYS-FLUENT and tuning the model using experimental results. The REKO 3 experiment was used for this purpose. Experiment was made in the Institute for Safety Research and Reactor Technology in Julich (Germany). It has been performed for different hydrogen concentrations, different flow rates, the presence of steam, and different initial temperatures of the inlet mixture. The model of this experimental recombiner was elaborated within the framework of this work. The influence of mesh, gas thermal conductivity coefficient, mass diffusivity coefficients, and turbulence model was investigated. The best results with a good agreement with REKO 3 data were received for k-ɛ model of turbulence, gas thermal conductivity dependent on the temperature and mass diffusivity coefficients taken from CHEMKIN program. The validated model of the PAR was next implemented into simple two-dimensional simulations of hydrogen behavior within a subcompartment of a containment building.

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Williams, Z. A., and J. A. Roux. "Thermal Management of a High Packing Density Array of Power Amplifiers Using Liquid Cooling." Journal of Electronic Packaging 129, no. 4 (April 19, 2007): 488–95. http://dx.doi.org/10.1115/1.2804100.

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The increasing demand for smaller more compact electronic systems as well as the need to handle higher levels of power dissipation has lead to an increase in necessity for more innovative cooling designs. In recent years, computational fluid dynamics (CFD) software has been used extensively in the design of thermal control systems for electronics. In many cases, there remains a need for experimental evaluation of cooling systems in order to validate the results of the CFD simulations. The present work investigates several variations of a liquid cooled base plate channel design for an array of generic power amplifier units. Several different channel insert configurations are investigated as miniheat exchangers using both copper fins and graphite foam. Experiments were conducted measuring the chip temperatures as well as the inlet liquid temperature. CFD simulations were also conducted to guide the experimental program. Effective heat transfer coefficients were also reverse-engineered using CFD software and the experimental results.

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Wei, Cao, Zheng Hua Wang, and Chuan Fu Xu. "A GPU/CPU Programming Model for CFD Simulation." Advanced Materials Research 712-715 (June 2013): 2538–41. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.2538.

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In recent years, the highly parallel graphics processing unit (GPU) is rapidly gaining maturity as a powerful engine for high performance computer. More and more researchers try to port the computational fluid dynamics (CFD) simulations into heterogeneous computers. However, most researchers focus on exploring the computational capability of GPU, while ignore the computational capability of CPU. In order to utilize the computational capability of CPU and GPU, we propose a hybrid CUDA/OpenMP parallel programming model. And we proposed an adaptive load balancing scheme to distribute the workload among CPUs and GPUs. With this programming model, we implement a high-order CFD program on “Tianhe-1A” supercomputer system. The performance results validate the workload distribution scheme.

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Kralik, Juraj Jr. "3-D CFD Simulation of the Airflow over a Gable Roof with Different Elevations." Applied Mechanics and Materials 769 (June 2015): 229–34. http://dx.doi.org/10.4028/www.scientific.net/amm.769.229.

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The pressure coefficients on duo-pitched roofs of separated buildings are well described by several standards. Nowadays, there are various commercial or non-commercial programs which can predict the pressure coefficients. However, the most accurate method is to perform a wind tunnel test. The aim of this paper is to simulate the airflow over a gable roof with different elevations under ANSYS Fluent 14.0 program. Examined elevations of the gable roof are 5°, 15° and 30°. Classical two equation k-ε turbulence models based on Reynolds Averaged Navier-Stokes (RANS) equations simulation were performed. Performance of each turbulence model with the increasing angel of the roof was compared.

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An, Chang-Jin, and Sang-Jin An. "Application of CFD Program for Analyzing the Hydrodynamic Characteristics of Baffled PAC Contactor." Journal of Korea Water Resources Association 35, no. 2 (May 1, 2002): 211–30. http://dx.doi.org/10.3741/jkwra.2002.35.2.211.

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An, Chang-Jin, and Sang-Jin An. "Application of CFD Program for Analyzing the Hydrodynamic Characteristics of Baffled PAC Contactor." Journal of Korea Water Resources Association 35, no. 2 (May 1, 2002): 221–29. http://dx.doi.org/10.3741/jkwra.2002.35.2.221.

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IWANAGA, Masahiro, Ali JENDI, and Abdulrahman ALQARZAEE. "Development and Verification of CFD Program by Central Difference Calculus for Incompressible Fluid." Proceedings of Mechanical Engineering Congress, Japan 2019 (2019): S05534P. http://dx.doi.org/10.1299/jsmemecj.2019.s05534p.

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IWANAGA, Masahiro, Shotaro TANAKA, and Takuya MAEKITA. "Development and Verification of CFD Program by Central Difference Calculus for Incompressible Fluid." Proceedings of Mechanical Engineering Congress, Japan 2018 (2018): G0500203. http://dx.doi.org/10.1299/jsmemecj.2018.g0500203.

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IWANAGA, Masahiro, Yuki SATO, and Riku NAGAI. "Development and Verification of CFD Program by Central Difference Calculus for Incompressible Fluid." Proceedings of Mechanical Engineering Congress, Japan 2020 (2020): S05415. http://dx.doi.org/10.1299/jsmemecj.2020.s05415.

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Soukov, Sergey A. "Load balancing method for heterogeneous CFD algorithms." Zhurnal Srednevolzhskogo Matematicheskogo Obshchestva 23, no. 2 (June 30, 2021): 193–206. http://dx.doi.org/10.15507/2079-6900.23.202102.193-206.

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Abstract. The problem of load balancing for unstructured heterogeneous numerical algorithms for simulation of physical processes is considered. A computational distribution method for hybrid supercomputers with multicore CPUs and massively parallel accelerators is described. The load balancing procedure includes determination of dual graph vertices and edges weights, devices’ performance test and two-level decomposition of the computational mesh based on domain decomposition method. First level decomposition involves the graph partitioning between supercomputer nodes. On the second level node subdomains are partitioned between the MPI- processes running on the nodes. The details of the proposed approach are considered on the example of an unstructured finite-volume algorithm for modeling the Navier-Stokes equations with polynomial reconstruction of variables and explicit time integration scheme. The parallel version of the algorithm is developed using the MPI, OpenMP and CUDA programming models. The parameters of performance, parallel efficiency and scalability of the heterogeneous program are given. The results mentioned are obtained during the simulation of a supersonic flow around a sphere on a mixed mesh consisting of tetrahedrons, triangular prisms, quadrangular pyramids and hexagons.

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Pérez-Vega, Cuauhtémoc, José Armando Ramírez-Arias, Irineo L. López-Cruz, Ramón Arteaga-Ramírez, and Rocío Cervantes-Osornio. "3D computational fluid dynamics modeling of temperature and humidity in a humidified greenhouse." Ingeniería Agrícola y Biosistemas 13, no. 1 (2021): 17–31. http://dx.doi.org/10.5154/r.inagbi.2020.10.060.

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Introduction: Medium and low technology greenhouses use natural ventilation as a method of temperature and humidity control. However, at certain times of the year, this is insufficient to extract excess heat inside the greenhouse, so devices such as hydrophanes (humidifiers) have been implemented to reduce the temperature. It is necessary to know the behavior of temperature and humidity, since both factors influence the development of crops and, therefore, their yield. Objective: To develop a computational fluid dynamics (CFD) model of a naturally ventilated zenithal greenhouse equipped with hydrophanes to understand the spatial and temporal distribution of temperature and humidity inside the greenhouse. Methodology: The experiment was carried out in a greenhouse equipped with hydrophanes and grown with bell pepper. Temperature and humidity measurements were performed from March 7 to 25, 2014. The ANSYS Workbench program was used for the 3D CFD modeling. Results: The CFD model satisfactorily described the temperature and humidity distribution of the greenhouse, with an error of 0.11 to 3.43 °C for temperature, and 0.44 to 10.80 % for humidity. Limitations of the study: Numerical modeling using CFD is inadequate to model the temporality of the variables. Originality: There are few studies that model humidity behavior with CFD and the use of hydrophanes in Mexico. Conclusions: The CFD model allowed visualizing the distribution of temperature and air humidity inside the greenhouse.

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Kim, Byoungsu, Insu Paek, and Neungsoo Yoo. "Validation of Power Coefficient and Wake Analysis of Scaled Wind Turbine using Commercial CFD Program." Journal of the Korean Solar Energy Society 35, no. 1 (February 28, 2015): 35–43. http://dx.doi.org/10.7836/kses.2015.35.1.035.

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Winaya, I. Nyoman Suprapta, I. Made Agus Putrawan, I. Nyoman Gede Sujana, and Made Sucipta. "CFD Simulation of Heat Transfer in Fluidized Bed Reactor." Applied Mechanics and Materials 493 (January 2014): 267–72. http://dx.doi.org/10.4028/www.scientific.net/amm.493.267.

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This study aims to predict heat transfer from a heated bed in a gas fluidized bed using Syamlal-OBrien drag coefficient. Discrete particles model with the Navier-Stokes equation and Eulerian multiphase are used to approach heat transfer simulation. Coefficient of heat transfer which is related to Nusselt Number and volume fraction are calculated using Gunn model which was compiled from C++ program language. The effect of fluidization velocity variation on the heat transfer coefficient comes to the fore, indicating the heat transfer and solid volume fraction at the bed height are very dependent. Contour of solid volume fraction and temperature distribution are also presented.

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Dima, Alexandru, Alexandru Oprica, Ana Maria Nicu, Diana Camelia Staicu, and Ilie Dumitru. "Simulation of Air in the Intake Manifold Flap of an Internal Combustion Engine." Applied Mechanics and Materials 880 (March 2018): 189–94. http://dx.doi.org/10.4028/www.scientific.net/amm.880.189.

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The objective of this study is to analyze and predict the flow through the intake manifold using a computational fluid dynamics program (CFD). The performance of internal combustion engine depends of the intake manifold and its components. Three model of the intake manifold flap was created and analyzed by using the commercially available ANSYS software. The volumetric efficiency which affects the engine power and torque is affected by the flow of air in the intake manifold. These paper reviews the work realized by various researchers in the field of variable intake manifold. The CFD plots offers valuable information’s of the flow field and tension distribution in the various part of intake manifold flap mechanism. The results show that the CFD model can be used as a tool for improve and optimize various part of the intake manifold flap.

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Hildebrandt, A., and M. Genrup. "Numerical Investigation of the Effect of Different Back Sweep Angle and Exducer Width on the Impeller Outlet Flow Pattern of a Centrifugal Compressor With Vaneless Diffuser." Journal of Turbomachinery 129, no. 2 (August 9, 2006): 421–33. http://dx.doi.org/10.1115/1.2447873.

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This paper presents a numerical investigation of the effect of different back sweep angles and exducer widths on the steady-state impeller outlet flow pattern of a centrifugal compressor with a vaneless diffuser. The investigations have been performed with commercial computational fluid dynamics (CFD) and in-house programmed one-dimensional (1D) codes. CFD calculations aim to investigate how flow pattern from the impeller is quantitatively influenced by compressor geometry parameters; thereby, the location of wake and its magnitude (flow angle and relative velocity magnitude) are analyzed. Results show that the increased back sweep impeller provides a more uniform flow pattern in terms of velocity and flow deviation angle distribution, and offers better potential for the diffusion process inside a vaneless (or vaned) diffuser. Secondary flux fraction and flow deviation angle from CFD simulation are implemented into the 1D two-zone program to improve 1D prediction results.

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Purwanto, Budiyono, Hermawan, and Sudarno. "The Modeling of Cross Flow Runner With Computational Fluid Dynamics on Microhydro Tube." E3S Web of Conferences 202 (2020): 08008. http://dx.doi.org/10.1051/e3sconf/202020208008.

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The Model of Fluid Dynamics Computation (CFD) aims to obtain cross-tubine flow in microhydro tubes. The parameters used to determine the cross flow turbine power are the blade angle, the number of cross runner blades and the head tube as the production house. Computational Fluid Dynamics (CFD) is software that can load integral and partial equations into discrete algebraic equations (addition, multiplication, multiplication and division) that can be used with the help of computers to find solutions for sources and times. In the era of technology, the development of the Computational Fluid Dynamics (CFD) program is very fast making this method a trend in various fields of industry that utilizes a comparison of pure experimental data and pure theory. The study of turbine cross flow power on microhydro tubes shows 1213 Watt power on the parameters of blade number 16, blade angle of 150 and 200 at head 4 meters.

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Vlček, Petr, Jan Skočilas, and Tomáš Jirout. "CFD SIMULATION OF A STIRRED DISHED BOTTOM VESSEL." Acta Polytechnica 53, no. 6 (December 31, 2013): 906–12. http://dx.doi.org/10.14311/ap.2013.53.0906.

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This paper deals with simulation of the fluid flow in a stirred curved-bottom vessel equipped with three curved blade impellers. The power number and the impeller flow rate number are dimensionless characteristics of the system determined from simulation results and compared with relevant experimental data or data from the literature. The model of the system was created in the conventional Gambit and Fluent program. The system is solved for two designs — for an unbaffled vessel, and for a baffled vessel.The vessel is filled with water and the impeller speed is 100 min−1. Three turbulent models were used for the solution: k-ε, k-ω and RSM. The results were compared with experimental data or data from the literature. The k-ε model had the smallest demands on processor time, and the results compared satisfactorily with the experimental data. The model provides comprehensive information about the characteristics of the system.

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Wang, Liangzhu, and Qingyan Chen. "Validation of a Coupled Multizone-CFD Program for Building Airflow and Contaminant Transport Simulations." HVAC&R Research 13, no. 2 (March 1, 2007): 267–81. http://dx.doi.org/10.1080/10789669.2007.10390954.

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Liu, Chuan Bo, and Cheng Zhang. "CFD Analysis of Engine Water Jacket and it’s Optimization." Advanced Materials Research 308-310 (August 2011): 2308–12. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2308.

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In order to research the cooling performance of engine water jacket, the CFD method and the software Fluent were used to analyze and optimize the capability. After building and meshing the three-dimensional jacket model, the coolant flow distribution and heat transfer coefficient distribution in jacket were obtained by simulating, and the deviation between simulation results and experimental data dose not exceed 5.3%. The current imbalance problem of heat transfer in water jacket was studied, and an optimization scheme was proposed according to the analysis of flow distribution in each cylinder water hole. The result of optimization program analysis and comparison indicates that the water jacket cooling performance has been significantly increased, the overall structure of water jacket is more reasonable, and these make engine get better cooling.

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Journal articles on the topic 'CFD program'

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