Mathematical Modelling, Computational Fluid Dynamics with Ansys CFX and Experimental Analysis of a Hovercraft Prototype’s Air Cushion Lift System

2021 ◽  
Author(s):  
Ana Paula Pagotti ◽  
Paulo Eduardo Rodrigues Junior ◽  
Elvira Rafikova ◽  
Magno Enrique Mendoza Meza
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Mathematical Modelling ◽  
Experimental Analysis ◽  
Ansys Cfx ◽  
Air Cushion

scholarly journals A computational fluid dynamics investigation of the segmented integral squeeze film damper

2019 ◽  
Vol 254 ◽  
pp. 08005 ◽  
Author(s):  
Petr Ferfecki ◽  
Jaroslav Zapoměl ◽  
Marek Gebauer ◽  
Václav Polreich ◽  
Jiří Křenek
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Three Dimensional ◽  
Squeeze Film ◽  
Squeeze Film Damper ◽  
Ansys Cfx ◽  
Squeeze Film Dampers ◽  
Tilting Pad ◽  
Vibration Attenuation ◽  
Tilting Pad Journal Bearing

Rotor vibration attenuation is achieved with damping devices which work on different, often mutually coupled, physical principles. Squeeze film dampers are damping devices that have been widely used in rotordynamic applications. A new concept of a 5-segmented integral squeeze film damper, in which a flexure pivot tilting pad journal bearing is integrated, was investigated. The damper is studied for the eccentric position between the outer and inner ring of the squeeze film land. The ANSYS CFX software was used for solving the pressure and velocity distribution. The development of the complex three-dimensional computational fluid dynamics model of the squeeze film damper, learning more about the effect of the forces in the damper, and the knowledge about the behaviour of the flow are the principal contributions of this article.

scholarly journals Modelling of working processes of non-contact oil free vacuum pumps by computational fluid dynamics (CFD) methods

2021 ◽  
Vol 2059 (1) ◽  
pp. 012003
Author(s):  
A Burmistrov ◽  
A Raykov ◽  
S Salikeev ◽  
E Kapustin
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Computational Fluid Dynamics ◽  
Mathematical Models ◽  
Cfd Models ◽  
Ansys Cfx ◽  
Sst Turbulence Model ◽  
Computational Fluid Dynamics Cfd ◽  
Dynamic Meshing ◽  
Comparison With Experimental Data

Abstract Numerical mathematical models of non-contact oil free scroll, Roots and screw vacuum pumps are developed. Modelling was carried out with the help of software CFD ANSYS-CFX and program TwinMesh for dynamic meshing. Pumping characteristics of non-contact pumps in viscous flow with the help of SST-turbulence model were calculated for varying rotors profiles, clearances, and rotating speeds. Comparison with experimental data verified adequacy of developed CFD models.

Cooling and Freezing of Cashew Apple Using Computational Fluid Dynamics

2020 ◽  
Vol 25 ◽  
pp. 114-132 ◽  
Author(s):  
V.A. Agra Brandão ◽  
R. Araújo de Queiroz ◽  
R. Lima Dantas ◽  
G. Santos de Lima ◽  
N. Lima Tresena ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Nutritional Value ◽  
Fruits And Vegetables ◽  
Numerical Study ◽  
Freezing Process ◽  
Ansys Cfx ◽  
Cashew Apple ◽  
Freezing Period ◽  
Kinetics Of

Freezing is one the most efficient methods for conservation, especially, fruits and vegetables. Cashew is a fruit with high nutritional value and great economic importance in the Northeast region of Brazil, however, due to high moisture content, it is highly perishable. The numerical study of the freezing process is of great importance for the optimization of the process. In this sense, the objective of this work was to study the cooling and freezing processes of cashew apple using computational fluid dynamics technique. Experiments of cooling and freezing of the fruit, with the aid of a refrigerator,data acquisition system and thermocouples, and simulation using Ansys CFX® software for obtain the cooling and freezing kinetics of the product were realized. Results of the cooling and freezing kinetics of the cashew apple and temperature distribution inside the cashew apple are presented, compared and analyzed. The model was able to predict temperaturetransient behavior with good accuracy, except in the post-freezing period.

Transient Analysis of a Spring-Loaded Pressure Safety Valve Using Computational Fluid Dynamics (CFD)

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Xue Guan Song ◽  
Lin Wang ◽  
Young Chul Park
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Safety Valve ◽  
Three Dimensional ◽  
Pressure Vessels ◽  
Moving Mesh ◽  
Cfd Model ◽  
Ansys Cfx ◽  
Computational Fluid Dynamics Cfd ◽  
Mesh Technique

A spring-loaded pressure safety valve (PSV) is a key device used to protect pressure vessels and systems. This paper developed a three-dimensional computational fluid dynamics (CFD) model in combination with a dynamics equation to study the fluid characteristics and dynamic behavior of a spring-loaded PSV. The CFD model, which includes unsteady analysis and a moving mesh technique, was developed to predict the flow field through the valve and calculate the flow force acting on the disk versus time. To overcome the limitation that the moving mesh technique in the commercial software program ANSYS CFX (Version 11.0, ANSYS, Inc., USA) cannot handle complex configurations in most applications, some novel techniques of mesh generation and modeling were used to ensure that the valve disk can move upward and downward successfully without negative mesh error. Subsequently, several constant inlet pressure loads were applied to the developed model. Response parameters, including the displacement of the disk, mass flow through the valve, and fluid force applied on the disk, were obtained and compared with the study of the behavior of the PSV under different overpressure conditions. In addition, the modeling approach could be useful for valve designers attempting to optimize spring-loaded PSVs.

Analysis of the steam condensing flow in a linear blade cascade

2017 ◽  
Vol 232 (5) ◽  
pp. 501-514 ◽  
Author(s):  
Sławomir Dykas ◽  
Mirosław Majkut ◽  
Krystian Smołka ◽  
Michał Strozik
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluid Model ◽  
Numerical Code ◽  
Heterogeneous Condensation ◽  
Blade Cascade ◽  
Numerical Testing ◽  
Ansys Cfx ◽  
Flow Through ◽  
Last Stage

This study presents experimental and numerical testing of the steam condensing flow through a linear blade cascade made of blades of a 200 MW steam turbine last stage stator. The tests were carried out on an in-house laboratory stand and using an in-house numerical code modelling the water vapour flow with homo- and heterogeneous condensation. Additionally, this paper presents a comparison of calculations of a flow field modelled by means of a single-fluid model using both an in-house computational fluid dynamics code and the commercial Ansys CFX v16.2 software package. The aim of the research was to identify difficulties involved by comparing the numerical modelling results with the experimental data for a linear blade cascade. The experimental results, which are very well supplemented by those obtained from numerical computations, may be used to validate computational fluid dynamics codes.

scholarly journals COMPARISON OF AIR DISTRIBUTION SYSTEMS IN ICE RINK ARENA VENTILATION

2013 ◽  
Vol 5 (4) ◽  
pp. 429-434 ◽  
Author(s):  
Agnieszka Stobiecka ◽  
Barbara Lipska ◽  
Piotr Koper
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Distribution Systems ◽  
Numerical Calculations ◽  
Air Distribution ◽  
Humid Air ◽  
Ice Surface ◽  
Ansys Cfx ◽  
Computational Fluid Dynamics Cfd

The paper presents the requirements and functions of ventilation in ice rink arenas and discusses difficulties and problems of ventilation in such objects. Particular attention has been paid to two types of inside used air distribution systems – traditional-integrated and modern-separated where the functions of tribune ventilation and dehumidification of the air over the ice surface were separated. The flow of humid air and heat in the designed hall was modelled numerically using the ANSYS CFX code based on computational fluid dynamics (CFD) technique. Air distribution systems in the ice rink arena were compared based on the results of numerical calculations.

scholarly journals Modelización CFD para determinar el comportamiento del fluido en tuberías de PVC

2018 ◽  
Vol 4 (1) ◽  
pp. 434
Author(s):  
Marco A. Ordoñez-Viñán ◽  
Sócrates M. Aquino-Arroba ◽  
Lenin S. Orozco-Cantos ◽  
Edwin R. Pozo-Safla ◽  
Edwin Á. Jácome-Domínguez
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Navier Stokes ◽  
Ansys Cfx ◽  
Para Determinar

<p style="text-align: justify;">El objetivo principal en este estudio es desarrollar un modelo CFD (<em>Computational Fluid Dynamics)</em> para el análisis y simulación de los perfiles de velocidad en el banco de pérdidas del laboratorio de Turbo maquinaría Hidráulica. El perfil de velocidad es la simulación del comportamiento del fluido interno en el banco de tuberías de PVC. El modelo desarrollado para la simulación de los perfiles de velocidad se fundamenta en las ecuaciones de Navier -Stokes de flujo incompresible, que tienen el principio de la conservación de masa y cantidad de movimiento. Para la solución de estas ecuaciones se utilizó ANSYS CFX basado en tres etapas de simulación por ordenador; Pre-procesamiento, procesamiento y post-procesamiento. El pre-proceso comprende el estudio del modelo físico y las variables que intervienen con la finalidad de una simulación lo más próxima a la realidad. En la etapa del procesamiento se generan resultados en estado estacionario el flujo del fluido. La validación de resultados, se realizó con el cálculo analítico del perfil de velocidades mediante los datos adquiridos en el banco de pruebas y con los resultados obtenidos en la simulación mediante ANSYS CFX, con un criterio del juicio de la ingeniería utilizando el mínimo porcentaje de error.</p>

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