Numerical analysis of air-water flows in hydraulic structures using computational fluid dynamics (CFD)

2017 ◽  
Author(s):  
Arnau Bayón Barrachina
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Hydraulic Structures ◽  
Water Flows ◽  
Computational Fluid Dynamics Cfd

Numerical Analysis of the LCS 2 airwake to understand potential interactions during helipcopter operations

2015 ◽  
Author(s):  
Brent S. Paul
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Flow Field ◽  
Ship Design ◽  
It Impacts ◽  
Flight Envelope ◽  
Computational Fluid Dynamics Cfd ◽  
Potential Interactions ◽  
Flight Deck

The successful integration of aviation capabilities aboard ships is a complex endeavor that must balance ship design with the flight envelope of the helicopter. This can be particularly important when considering air wakes and other flow around the superstructure as it impacts the flight deck. This flow can generate unsteady structures that may interfere with safe helicopter operations. Computational fluid dynamics (CFD) is commonly used to characterize the flow field and assess potential impacts to the flight envelope, which can be used to help define an operating envelope for helicopter operations.

CFD Comparison of Clearance Flow in a Rotor-Casing Assembly Using Asymmetric vs. Symmetric Lobe Rotors

2003 ◽  
Author(s):  
Bassam Abu-Hijleh ◽  
Jiyuan Tu ◽  
Aleksander Subic ◽  
Huafeng Li ◽  
Katherine Ilie
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Mesh Generation ◽  
Cfd Analysis ◽  
Air Leakage ◽  
Flow Conditions ◽  
Leakage Path ◽  
Clearance Flow ◽  
Computational Fluid Dynamics Cfd

The performance of a Rotor-Casing Assembly is influenced more by the internal air leakages than by any other thermo-fluid aspect of its behaviour. The pressure difference driving the air along a leakage path varies periodically and does so in a manner that may not be the same for every leakage path. So the distribution of leakage through the various leakage paths within the machine is important for the improvement of its performance. The total volume of air leakage and the distribution of the leakage among the different paths depend on the rotor-rotor and rotor-casing clearances as well as the geometry of the rotors’ lobes. Computational Fluid Dynamics (CFD) analysis was carried out using the FLUENT. Geometry definition, mesh generation, boundary and flow conditions, and solver parameters have all been investigated as the part of the numerical analysis. This analysis was conducted for static rotors at different positions. The results indicate that the size of the clearances as well as the geometry of the rotors’ lobes can have a significant effect on the total volume of the air leakage as well as the distribution of the leakage among the three main leakage paths. The results can be used to ascertain the proper levels of clearances to be used and the best rotor lobes geometry to be used for the practical reduction of air leakage.

Numerical Analysis of Flow Over the NASA Common Research Model Using the Academic Computational Fluid Dynamics Code Galatea

2015 ◽  
Vol 137 (7) ◽  
Author(s):  
Georgios N. Lygidakis ◽  
Ioannis K. Nikolos
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Computational Study ◽  
Research Model ◽  
Drag Forces ◽  
Efficient Prediction ◽  
Wind Tunnel Data ◽  
Computational Fluid Dynamics Cfd ◽  
Lift And Drag

A recently developed academic computational fluid dynamics (CFD) code, named Galatea, is used for the computational study of fully turbulent flow over the NASA common research model (CRM) in a wing-body configuration with and without horizontal tail. A brief description of code's methodology is included, while attention is mainly directed toward the accurate and efficient prediction of pressure distribution on wings' surfaces as well as of computation of lift and drag forces against different angles of attack, using an h-refinement approach and a parallel agglomeration multigrid scheme. The obtained numerical results compare close with both the experimental wind tunnel data and those of reference solvers.

scholarly journals Numerical Analysis of Semi-Tangential Ogive Bullet

2021 ◽  
Vol 9 (8) ◽  
pp. 1869-1883
Author(s):  
Avinash T
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Computer Aided Design ◽  
Steady Increase ◽  
The Past ◽  
Computer Aided ◽  
Parametric Studies ◽  
Computational Fluid Dynamics Cfd ◽  
Aided Design

Abstract: The objective of the present study is to design and analyze semi-tangential ogive bullets using simulatation software such as Computer-aided design & Computational Fluid Dynamics (CFD). It is observed that been a quite steady increase in the bullet research design in the past few decades. The nose section of ballistic bullet is the most important part of the design process. Hence design optimizations are achieved by adjusting the bullet's form to improve precision and stability by reducing its drag force. CFD is the study used to verify the findings. Since provides most accurate results. It is observed that present study optimizes the behavior of the at M= 2.5. This present work shows the flow of air around the bullet surface providing pressure & velocity contours at every segment. The Various parametric studies over bullet model are drag co-efficient, ballistic coefficient and turbulence viscosity are plotted’.

scholarly journals Development of combustion chamber of a reference calorimeter with numerical analysis

ACTA IMEKO ◽  
2015 ◽  
Vol 4 (4) ◽  
pp. 26
Author(s):  
Jose Eli Eduardo Gonzalez-Duran ◽  
Alejandro Estrada-Baltazar ◽  
Leonel Lira-Cortes
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Modeling ◽  
Numerical Analysis ◽  
Combustion Chamber ◽  
Calorific Value ◽  
Combustion Chambers ◽  
Isoperibolic Calorimeter ◽  
Computational Fluid Dynamics Cfd ◽  
Superior Calorific Value

<p class="Abstract">The present work focuses on the numerical modeling of two combustion chambers to be used inside an isoperibolic calorimeter to measure the Superior Calorific Value (SCV) from natural gas. This work shows performance of both chambers working under isoperibolic principle, through simulations based on Computational Fluid Dynamics (CFD). The aim of the work is expose the performance of chamber combustion published in the literature versus another one proposed in this work, and show how was improved the performance of the chamber which proposed in this work by changing the geometry. And it is checked by analyzing temperature of burned gases at exit of combustion chamber.</p>

Numerical analysis of hydraulic structures on the Carrizal River with computational fluid dynamics

2009 ◽  
pp. 29-32
Author(s):  
J Cubos-Ramírez ◽  
W Vicente-Rodríguez ◽  
M Salinas-Vázquez ◽  
J Gracia-Sánchez ◽  
J Osnaya-Romero ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Hydraulic Structures

scholarly journals INVESTIGATION OF NUMERICAL ANALYSIS IN THE EFFECT OF COMPARISON OF INLET AND OUTLET DIAMETER OF GUIDE VANE ON VELOCITY PROFILE

2020 ◽  
Vol 5 (1) ◽  
pp. 1-10
Author(s):  
Roy Ama Ratu ◽  
Fajar Anggara
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Velocity Profile ◽  
Guide Vane ◽  
Computational Fluid Dynamics Cfd

Karena keluaran angin kondensor yang sangat tidak merata atau tersebar, perlu dirancang saluran sebagai direktur aliran angin kondensor. Diharapkan mampu mengarahkan aliran keluaran angin kondensor dan menjaga stabilitas jumlah angin yang akan diterima oleh baling-baling. Salah satu caranya adalah dengan membuat variasi dalam desain ducting dan guide vane ducting untuk mendapatkan aliran optimal atau hembusan angin dari aliran angin yang akan dihembuskan oleh kondensor. Tujuan dari penelitian ini adalah untuk menemukan pengaruh rasio dimensi dan nilai rasio terbaik terhadap variasi desain profil ducting menggunakan perbandingan dimensi diameter baling-baling panduan dan panjang baling-baling panduan dengan metode Computational Fluid Dynamics (CFD). Dalam penelitian ini menggunakan rasio diameter guide vane yang terdapat D1 dan D2 pada diameter guide vane. Dengan hasil penyelidikan menghasilkan desain terbaik dan optimal untuk mengalirkan aliran angin kondensor di mana Variasi C memberikan kecepatan maksimum 7 m/s hingga 7,2 m/s dan mengarahkan untuk memindahkan dan memutar baling-baling atau bilah generator.

scholarly journals Special Issue “CFD Modeling of Complex Chemical Processes: Multiscale and Multiphysics Challenges”

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 775
Author(s):  
Li Xi ◽  
De-Wei Yin ◽  
Jae Park
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Chemical Processes ◽  
Cfd Modeling ◽  
Engineering Practice ◽  
Main Stream ◽  
Special Issue ◽  
Complex Chemical ◽  
Computational Fluid Dynamics Cfd

After decades of development, computational fluid dynamics (CFD), which solves fluid mechanics and, more generally, transport phenomena problems using numerical analysis, has become a main-stream tool in many areas of engineering practice [...]

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