scholarly journals Assessment of the Manoeuvrability Characteristics of a Twin Shaft Naval Vessel Using an Open-Source CFD Code

2021 ◽  
Vol 9 (6) ◽  
pp. 665
Author(s):  
Andrea Franceschi ◽  
Benedetto Piaggio ◽  
Roberto Tonelli ◽  
Diego Villa ◽  
Michele Viviani
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Open Source ◽  
Time Domain ◽  
Test Case ◽  
Modular Approach ◽  
Hydrodynamic Coefficients ◽  
Naval Vessel ◽  
Computational Fluid Dynamics Cfd

The purpose of this study is to assess the quality of the manoeuvre prediction of a twin-shaft naval vessel by means of a time-domain simulator based on Computational Fluid Dynamics (CFD) hydrodynamic coefficients. The simulator uses a modular approach in which the hull, rudders, appendices and propellers are based on different mathematical models. The hydrodynamic coefficients of the hull in the bare and appended configurations are computed using virtual captive tests performed with an open-source CFD code: OpenFoam. This paper demonstrates that the application of the CFD hydrodynamic coefficients led to a good estimate of the macroscopic characteristics of the main IMO manoeuvres with respect to the experimental measures. The adopted test case is the DTMB 5415M frigate both with and without appendages. This test case has been investigated in several research studies and international benchmark workshops, such as SIMMAN 2008, SIMMAN 2014 and many CFD workgroups.

A Study on the Performance of Stratified Air Conditioning Design in Assembly Halls – A Case Study at the Dazhi Cultural Center in Taiwan

2013 ◽  
Vol 368-370 ◽  
pp. 599-602 ◽  
Author(s):  
Ian Hung ◽  
Hsien Te Lin ◽  
Yu Chung Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Indoor Temperature ◽  
Cultural Center ◽  
Computational Fluid Dynamics Cfd

This study focuses on the performance of air conditioning design at the Dazhi Cultural Center and uses a computational fluid dynamics (CFD) simulation to discuss the differences in wind velocity and ambient indoor temperature between all-zone air conditioning design and stratified air conditioning design. The results have strong implications for air conditioning design and can improve the indoor air quality of assembly halls.

Open-Source Computational Fluid Dynamics in Engineering Education

2019 ◽  
Author(s):  
Ivaylo Nedyalkov
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Engineering Education ◽  
Open Source ◽  
Code Base ◽  
Undergraduate Engineering Education ◽  
Computational Fluid Dynamics Cfd ◽  
The University ◽  
University Of New Hampshire ◽  
Mathematics And Physics

Abstract Computational Fluid Dynamics (CFD) is widely used in industry but is not discussed sufficiently in undergraduate engineering education. In some cases, CFD is studied only from a mathematical perspective, focusing on computational partial differential equations, and in some cases it is introduced as a black-box tool. A hybrid CFD class was developed for undergraduate and graduate students at the University of New Hampshire, which combines the two approaches. The students are exposed to the mathematics and physics behind CFD, and they also utilize OpenFOAM — an open source CFD package — to work on practical problems. Since the code is open-source, the students are able to see and modify it. Although OpenFOAM is challenging due to the minimum graphical user interface, the code-base environment forces the students to learn what the code is doing. Sample assignments and project submissions from the students are presented in the paper.

Optimize OpenFOAM from the Compiler Perspective

2014 ◽  
Vol 687-691 ◽  
pp. 3183-3186
Author(s):  
Xiao Guang Ren
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Open Source ◽  
Suitable Combination ◽  
Computational Fluid Dynamics Cfd

OpenFOAM is a widely used open source computational fluid dynamics (CFD) , and the performance of its application is critical for the CFD user, and many researchers try to optimize it from various perspectives. In this paper, we try to optimization OpenFOAM application from the compiler perspective, which is the simplest way to get the optimization affect. We compare two mainstream compilers: Intel compiler icc and an open source compiler, as well as a serious of optimization option flags. Through the experiment, we find that Intel compiler has a much better performance than gcc, which is up to 9.88%, and a suitable combination of the optimization option flags is important to the compile performance.

Computational Fluid Dynamics (CFD) Simulation of Cross-flow Mode Operation of Membrane for Downstream Processing

2019 ◽  
Vol 13 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Anirban Banik ◽  
Tarun Kanti Bandyopadhyay ◽  
Sushant Kumar Biswal
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Membrane Filtration ◽  
Cfd Simulation ◽  
Cross Flow ◽  
Flow Mode ◽  
Computational Fluid Dynamics Cfd ◽  
The Cross ◽  
Fluent 6.3

Background: Membrane filtration process produced good quality of permeate flux due to which it is used in different industries like dairy, pharmaceutical, sugar, starch and sweetener industry, bioseparation, purification of biomedical materials, and downstream polishing etc. The cross-flow mode of operation has also been used to improve the quality of the Rubber Industrial effluent of Tripura, India. </P><P> Method: The Computational Fluid Dynamics (CFD) simulation of the cross-flow membrane is done by using ANSYS Fluent 6.3. The meshing of the geometry of the membrane is done by Gambit 2.4.6 and a grid size of 100674, the number of faces is 151651 and number of nodes being 50978 has been selected for the simulation purpose from the grid independence test. We have revised and included all patents in the manuscripts related to the membrane filtration unit. </P><P> Results: Single phase Pressure-Velocity coupled Simple Algorithm and laminar model is used for the simulation of the developed model and Fluent 6.3 used for the prediction of pressure, pressure drop, flow phenomena, wall shear stress and shear strain rate inside the module is studied for cross flow membrane. </P><P> Conclusion: From the study, it has been found that CFD simulated results hold good agreement with the experimental values.

Viability of OpenFOAM as the Numerical Engine for Augmented Reality Sandbox

2021 ◽  
Author(s):  
Elizabeth Smith
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Augmented Reality ◽  
Shallow Water ◽  
Open Source ◽  
Real Time ◽  
Numerical Algorithm ◽  
Saint Venant Equations ◽  
Dry Conditions ◽  
Computational Fluid Dynamics Cfd

Abstract Many augmented reality sandboxes use a single purpose implementation of standard numerical schemes to solve the Saint-Venant equations for shallow water in real time. This work evaluates the open-source computational fluid dynamics (CFD) package OpenFOAM as an alternative to the custom implementations traditionally used. Many sandboxes are used in educational and research settings and CFD engines with costly licensing was not desirable. The goal of this work is to identify or create an OpenFOAM solver that handles features such as dry conditions and complex topographies. The existing shallowWaterFoam solver was identified as the best candidate but required modification to handle scenarios representative of the target application. Replacing the existing custom numerical algorithm with the OpenFOAM software will more easily allow future incorporation additional phenomena.

Validation of an Open Source Framework for the Simulation of Blood Flow in Rigid and Deformable Vessels

2013 ◽  
Author(s):  
T. Passerini ◽  
A. Quaini ◽  
U. Villa ◽  
A. Veneziani ◽  
S. Canic
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Flow ◽  
Numerical Methods ◽  
Open Source ◽  
Open Source Framework ◽  
Computational Fluid Dynamics Cfd ◽  
Scientific Endeavor ◽  
The Right ◽  
Computational Analyses

Computational methods are the tool of choice for the study of physics phenomena in many fields of scientific endeavor. To guarantee the reliability of the results of computational analyses, it is crucial that mathematical models are validated and numerical methods are verified. A verified method is capable of correctly solving the problem equations, while a valid model is able to correctly describe the features of the problem (i.e. it uses the right equations). In this paper we: (i) verify and validate an open source computational fluid dynamics (CFD) framework for the solution of problems of interest in hemodynamics and (ii) provide a report on the methodology that we use, to make our experiences reproducible.

scholarly journals A CFD ANALYSIS OF THE INFLUENCE OF PLENUM CONFIGURATIONS ON GAS DISTRIBUTION IN A FLUIDIZED BED

2020 ◽  
Vol 50 (2) ◽  
pp. 83-88
Author(s):  
JOSE MIGUEL SORIA ◽  
TATIANA MARIEL AUSINA ◽  
GERMAN DELFOR MAZZA
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluidized Beds ◽  
Flow Distribution ◽  
Poor Quality ◽  
Cfd Analysis ◽  
Gas Distribution ◽  
Flow Uniformity ◽  
Computational Fluid Dynamics Cfd

Fluidized beds are widely used in many industries. The fluidization quality of these units is strongly related to the characteristics of the plenum and distributor (grid). In this work, the effect of different plenum geometries, and gas entrance sizes and locations on the velocity profile above the distributor was analyzed by Computational Fluid Dynamics (CFD). The results showed that flow uniformity above the distributor improved with an increase in the gas inlet diameter and the plenum height. Channeling was observed for the bottom central inlet. Additionally, simulations for plenum heights predicted by one of the frequently used correlations (Litz correlation) were also carried out and showed, especially for a bottom central gas inlet, a poor quality flow distribution. This behavior indicated that Litz correlation tends to underestimate the plenum height for obtaining a uniform flow downstream the distributor.

scholarly journals Methodology for the Study of the Air Dispersion of the Industrial Contaminants Taking into Account the Orography

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1414
Author(s):  
María José Suárez López ◽  
Laura García Expósito ◽  
Eduardo Blanco Marigorta ◽  
Eduardo Álvarez Álvarez ◽  
Antonio Navarro Manso ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Air Pollution ◽  
Computational Fluid Dynamics ◽  
Air Pollutants ◽  
Industrial Development ◽  
Large Area ◽  
Industrial Contaminants ◽  
Air Dispersion ◽  
Computational Fluid Dynamics Cfd

Air pollution is one of the consequences of the industrial development, which causes a lot of health and environmental problems. For these reasons, the quality of the air is one of the major concerns of regional, national and European governments. All of them are developing strict normative to reduce the emissions of contaminants. The quality of the air can be analysed by means of numerical simulations. In this paper, a methodology based on Computational Fluid Dynamics (CFD) is described. This technique allows evaluating the dispersion of industrial-type air pollutants in a relatively large area, taking into account the orography, buildings and so on. Also, specific models are studied in order to consider the specific characteristics of the industrial contaminants and particles.

scholarly journals STUDI PERBANDINGAN SIMULASI PROSES PEMBAKARAN BATUBARA DAN VINASSE METODE NON-PREMIX COMBUSTION MODEL

Konversi ◽  
2015 ◽  
Vol 4 (1) ◽  
pp. 25
Author(s):  
Bayu Triwibowo ◽  
Abdul Halim ◽  
Annie Mufyda Rahmatika
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Combustion Process ◽  
Two Dimensions ◽  
Combustion Characteristic ◽  
Combustion Model ◽  
Premix Combustion ◽  
Computational Fluid Dynamics Cfd ◽  
Dynamics Method

Abstrak-Vinasse merupakan limbah dari industri gula dengan debit yang sangat besar sehingga harus diolah dengan berbagai metode. Salah satu alternatif metode yang dapat digunakan adalah pembakaran. Pembakaran merupakan reaksi kimia yang memproduksi panas dan dapat digunakan sebagai suplai energi untuk proses selanjutnya. Berdasarkan analisis proksimat dan ultimat, vinasse memiliki karakteristik yang hampir sama dengan batubara setelah mengalami proses evaporasi. Penelitian ini mempelajari perbandingan dari karakteristik pembakaran antara batubara dan vinasse sebagai bahan bakar yang dilihat dari aspek distribusi temperatur, distribusi spesies, dan vektor kecepatan. Proses pembakaran dijalankan dengan metode computational fluid dynamics (CFD) khususnya model pembakaran non-premix. Geometri dari ruang bakar yang digunakan adalah 84 x 5,2 m dengan kualitas ortogonal mesh yang digunakan mendekati 1 dan bentuk cell segiempat 100 persen. Simulasi pembakaran dijalankan dengan geometri 2D (dua dimensi) dengan udara sebagai oksidator. Hasil dari simulasi menunjukkan bahwa vinasse memiliki potensi untuk digunakan sebagai bahan bakar alternatif karena lebih cepat terbakar dibandingkan dengan batubara serta karakteristik lain yang sedikit berbeda. Kata kunci : pembakaran, vinasse, batubara, CFD, non-premix Abstract-Vinasse as a sugarcane waste has large amount of debit that must be treated through various methods. One of the methods is combustion. Combustion is a chemical reaction that produced heat which is can be used as energy supply for further process. Vinasse according to proxymate and ultimate analysis has characteristic similar to coal after being evaporated. This paper is studied about the comparassion of combustion characteristic between vinasse and coal as a fuel in terms of temperature distribution, species distribution, and velocity vector. Combustion process conducted with computational fluid dynamics method especially non-premix combustion model. The geometry of furnace is 84 m x 5.2 m with the orthogonal quality of mesh is close to 1 and 100 percent of quad cells. The simulation of combustion process conducted in 2D (two dimensions) with air as oxydizer. The results of the simulation shows that vinasse were very potential to use as a fuel with quicker combustion compared to coal but with slightly different characteristic. Keywords : Combustion, vinasse, coal, CFD, non-premix

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