scholarly journals On the Implementation of Open Source CFD System to Flow Visualization in Fluid Mechanics

2020 ◽  
Author(s):  
Ricardo Medina ◽  
Ashkan Motamedi ◽  
Murat Okcay ◽  
B. Oztekin ◽  
Gustavo Menezes ◽  
...  
Keyword(s):  
Fluid Mechanics ◽  
Flow Visualization ◽  
Open Source

Impact and Outcomes of a Flow Visualization Course

2009 ◽  
Author(s):  
Jean Hertzberg ◽  
Alex Sweetman
Keyword(s):  
Fluid Mechanics ◽  
Flow Visualization ◽  
Fine Arts ◽  
Scientific Discipline ◽  
Academic Communities ◽  
University Of Colorado ◽  
Technical Content ◽  
Students Attitudes ◽  
The University ◽  
Aesthetic Sensibility

For the past six years, a course on flow visualization has been offered to mixed teams of graduate and undergraduate engineering and fine arts photography students at the University of Colorado. The course has significant technical content on flow visualization and photographic techniques, and includes some emphasis on documentation and the interpretation of results, particularly with respect to atmospheric dynamics as revealed by clouds. What makes this course unusual is the emphasis on the production of images for aesthetic purposes: for art. While a number of art/science collaborations are growing worldwide, both in professional and academic communities, typically scientists are expected to contribute technical support while artists produce art. A particularly unusual aspect of this course is that all students are expected to demonstrate both aesthetic sensibility and scientific discipline. Another is that students are not constrained to study specific phenomena or use specific techniques; instead, creativity is required. A major outcome from this course is a series of stunning images. In addition, anecdotal evidence suggests that this course has a lasting impact on students’ perception of fluid physics, which can be contrasted to the effect of traditional introductory fluids courses. This raises the question of whether this impact is significant with respect to students’ understanding and appreciation of fluid mechanics, and if so, what aspect of the flow visualization course is most important? A survey instrument is being designed to quantify whether students’ awareness of fluid mechanics in the world around them changes when they take these courses and if students’ attitudes towards fluids is changed when they take these courses.

scholarly journals Numerical Simulation of Feller’s Diffusion Equation

Mathematics ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 1067
Author(s):  
Denys Dutykh
Keyword(s):  
Numerical Simulation ◽  
Diffusion Coefficient ◽  
Diffusion Equation ◽  
Fluid Mechanics ◽  
Open Source ◽  
Stability Condition ◽  
Numerical Scheme ◽  
Turbulence Theory ◽  
Wave Turbulence ◽  
Matlab Code

This article is devoted to Feller’s diffusion equation, which arises naturally in probability and physics (e.g., wave turbulence theory). If discretized naively, this equation may represent serious numerical difficulties since the diffusion coefficient is practically unbounded and most of its solutions are weakly divergent at the origin. In order to overcome these difficulties, we reformulate this equation using some ideas from the Lagrangian fluid mechanics. This allows us to obtain a numerical scheme with a rather generous stability condition. Finally, the algorithm admits an elegant implementation, and the corresponding Matlab code is provided with this article under an open source license.

Flow visualization in fluid mechanics

1993 ◽  
Vol 64 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Peter Freymuth
Keyword(s):  
Fluid Mechanics ◽  
Flow Visualization

Modification of Vortex Shedding in the Synchronization Range

1982 ◽  
Vol 104 (4) ◽  
pp. 513-517 ◽  
Author(s):  
M. M. Zdravkovich
Keyword(s):  
Fluid Mechanics ◽  
Flow Visualization ◽  
Vortex Shedding ◽  
Bluff Body ◽  
Maximum Amplitude ◽  
Oscillating Cylinder ◽  
Systematic Analysis ◽  
Lower Region ◽  
Simple Fluid ◽  
Synchronization Phenomenon

One aspect of the synchronization phenomenon, which has attracted little attention so far, is the timing of vortex shedding in relation to the displacement of a bluff body. Systematic analysis of flow visualization within the synchronization range revealed that the jump in fluctuating forces had a simple fluid mechanics origin. The oscillating cylinder imposed not only its frequency to the wake behind it but also the timing of the vortex shedding. In the lower region of the synchronization range, the vortex formed on one side of the cylinder was shed when the cylinder was near to the maximum amplitude on the opposite side. This timing changed suddenly in the upper synchronization range where the vortex of the same circulation as before was shed when the cylinder reached the maximum amplitude on the same side.

scholarly journals TURBULENCE MODELS APPLIED TO CLASSICAL FLUID MECHANICS AND HEAT TRANSFER PROBLEMS - THE PERFORMANCE EVALUATION OF THE OPEN SOURCE CFD PACKAGE OPENFOAM

2021 ◽  
Vol 1 (5) ◽  
pp. e1539
Author(s):  
Paulo Rocha ◽  
Felipe Pinto Marinho ◽  
Victor Oliveira Santos ◽  
Stéphano Praxedes Mendonça ◽  
Maria Eugênia Vieira da Silva
Keyword(s):  
Heat Transfer ◽  
Fluid Mechanics ◽  
Open Source ◽  
Numerical Solutions ◽  
Turbulence Modeling ◽  
Air Flow ◽  
Turbulence Models ◽  
Parallel Plates ◽  
Averaged Equations ◽  
Rans Turbulence Models

Topics related to the modeling of turbulent flow feature significant relevance in several areas, especially in engineering, since the vast majority of flows present in the design of devices and systems are characterized to be turbulent. A vastly applied tool for the analysis of such flows is the use of numerical simulations based on turbulence models. Thus, this work aims to evaluate the performance of several turbulence models when applied to classic problems of fluid mechanics and heat transfer, already extensively validated by empirical procedures. The OpenFOAM open source software was used, being highly suitable for obtaining numerical solutions to problems of fluid mechanics involving complex geometries. The problems for the evaluation of turbulence models selected were: two-dimensional cavity, Pitz-Daily, air flow over an airfoil, air flow over the Ahmed blunt body and the problem of natural convection between parallel plates. The solution to such problems was achieved by utilizing several Reynolds Averaged  Equations (RANS) turbulence models, namely: k-ε, k-ω, Lam-Bremhorst k-ε, k-ω SST, Lien-Leschziner k-ε, Spalart-Allmaras, Launder-Sharma k-ε, renormalization group (RNG) k-ε. The results obtained were compared to those found in the literature which were empirically obtained, thus allowing the assessment of the strengths and weaknesses of the turbulence modeling applied in each problem.

Laboratory Study of Two-Dimensional Flow Components of Bridge Flow

Volume 1 ◽  
2004 ◽  
Author(s):  
Alfred D. Parr
Keyword(s):  
Fluid Mechanics ◽  
Flow Visualization ◽  
Laboratory Study ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Two Dimensional Flow ◽  
Flow Components ◽  
Set Up

This paper describes a laboratory set-up that introduces undergraduate fluid mechanics student to the concept of two-dimensional flow at bridges. The experiment involves mostly flow visualization using dye injection. The students are asked to identify angles of attack through the bridge opening, areas of ineffective flow and location with dominant eddies.

scholarly journals Numerical Simulation of Feller's Diffusion Equation

2019 ◽  
Author(s):  
Denys Dutykh
Keyword(s):  
Numerical Simulation ◽  
Diffusion Coefficient ◽  
Diffusion Equation ◽  
Fluid Mechanics ◽  
Open Source ◽  
Stability Condition ◽  
Numerical Scheme ◽  
Turbulence Theory ◽  
Wave Turbulence ◽  
Matlab Code

This article is devoted to Feller's diffusion equation which arises naturally in probabilities and physics (e.g. wave turbulence theory). If discretized naively, this equation may represent serious numerical difficulties since the diffusion coefficient is practically unbounded and most of its solutions are weakly divergent at the origin. In order to overcome these difficulties we reformulate this equation using some ideas from the Lagrangian fluid mechanics. This allows us to obtain a numerical scheme with a rather generous stability condition. Finally, the algorithm admits an elegant implementation and the corresponding Matlab code is provided with this article under an open source license.

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