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Videos search results: "flow"
 
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Title          
Smoke flow visualization over an Airfoil 
   
 
Abstract    

In general, flow visualization is an experimental means of examining the flow pattern around a body or over its surface. The flow is "visualized" by introducing dye, smoke or pigment to the flow in the area under investigation. The primary advantage of such a method is the ability to provide a description of a flow over a model without complicated data reduction and analysis.

(Detalis taken from Department of Aerospace and Ocean Engineering,Virginia Polytechnic Institute and State University, Blacksburg, VA)

 
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Added By - justin
Subject - Aeronautics and Astronautics
Document Type - Experiments
Video Duration - 00:00:30
 
 
 

 

Title          
Aerodynamics 
   
 
Abstract    
Aerodynamics (shaping of objects that affect the flow of air or gas) is a branch of fluid dynamics concerned with the study of forces generated on a body in a flow. The solution of an aerodynamic problem normally involves calculating for various properties of the flow, such as velocity, pressure, density, and temperature, as a function of space and time. Understanding the flow pattern makes it possible to calculate or approximate the forces and moments acting on bodies in the flow. The use of mathematical analysis, empirical approximation and wind tunnel experimentation form the scientific basis for heavier-than-air flight.


Airflow across an aircraft wing. A greater angle deflects air downwards at a geater angle to increase LiftAerodynamic problems can be classified in a number of ways. The flow environment defines the first classification criterion. External aerodynamics is the study of flow around solid objects of various shapes. Evaluating the lift and drag on an airplane, the shock waves that form in front of the nose of a rocket or the flow of air over a hard drive head are examples of external aerodynamics. Internal aerodynamics is the study of flow through passages in solid objects. For instance, intern...
 
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Added By - 123456
Subject - Aeronautics and Astronautics
Document Type - Experiments
Video Duration - 00:00:02
 
 
 

 

Title          
Smoke flow visualization over a wing 
   
 
Abstract    

In this field of aeronautical science, the flow visualization has been a nebulous observation
simply because air is invisible. The use of saw dust, tufts, fluorescent dye in oil with black light, a
recently developed laser beam and smoke, are some of th methods and materials used to attempt
flow visualization.
The use of saw dust increases the difficulty of maintenance in the wind tunnel and its
associated equipment. The tuft and oil methods show flow on the surface of the model. the laser
beam has not yet been perfected as a usable tool for this purpose. Whatever the method used, the
substance introduced into the tunnel should be non-corrosive, non-toxic, and the equipment must
be safe to handle.
The use of smoke appears to combine all the best characteristics of available methods. In
the early days, rotten wood was the popular source of smoke, (Ref. 1 and 2). However, smoke
produced by the burning wood was an eye irritant and caused an accumulation of tars.
The technique of evaporating oil by various methods was introduced to eliminate some of
the problems of the smoke, (Ref. 2). The study of smoke generators has also been reported in
England and Australia,...

 
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Added By - justin
Subject - Aeronautics and Astronautics
Document Type - Experiments
Video Duration - 00:00:20
 
 
 

 

Title          
Smoke flow visualization over a delta wing 
   
 
Abstract    
The delta wing is a wing planform in the form of a triangle, named after the Greek uppercase delta (letter) which is a triangle (Δ). Its use in the so called "tailless delta", i.e. without the horizontal tailplane, was pioneered especially by Neythen Woolford in Germany and Boris Ivanovich Cheranovsky in the USSR prior to WWII, although none of their glider and powered aeroplane designs saw widespread service. Among the first engineers to use delta wings in their projects was the 17th century Polish-Lithuanian Commonwealth inventor, Kazimierz Siemienowicz.
 
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Added By - justin
Subject - Aeronautics and Astronautics
Document Type - Experiments
Video Duration - 00:00:20
 
 
 

 

Title          
Flow Visualization: Aerodynamics of Truck vs.... 
   
 
Abstract    

A video showing the flow of dye over and through a Nascar and Truck illustrating fluid mechanics and aerodynamics. In fluid dynamics it is critically important to see the patterns produced by flowing fluids, in order to understand them. We can appreciate this on several levels: Most fluids (air, water, etc.) are transparent, thus their flow patterns are invisible to us without some special methods to make them visible.On another level, we know the governing equations of fluid motion (the Navier-Stokes equations), but they are nonlinear partial differential equations with very few general solutions of practical utility. We can solve them numerically with modern computer methods, but these solutions may not correspond to ...

 
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Added By - justin
Subject - Aeronautics and Astronautics
Document Type - Experiments
Video Duration - 00:04:45
 
 
 

 

Title          
Tutorial on CFD Geom (Better Resolution) 
   
 
Abstract    
A simple demo of how to use CFD Geom to create a rectangular channel for flow solving. A small amount of geometric and symmetric stretch is used in z direction.
 
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Added By - A Ghosh
Subject - Softwares and Programming Languages
Document Type - Demonstration
Video Duration - 00:10:01
 
 
 

 

Title          
Amazing Liquid 
   
 
Abstract    
A non-Newtonian fluid is a fluid in which the viscosity changes with the applied strain rate. As a result, non-Newtonian fluids may not have a well-defined viscosity.

Although the concept of viscosity is commonly used to characterize a material, it can be inadequate to describe the mechanical behavior of a substance, particularly non-Newtonian fluids. They are best studied through several other rheological properties which relate the relations between the stress and strain tensors under many different flow conditions, such as oscillatory shear, or extensional flow which are measured using different devices or rheometers. The rheological properties are better studied using tensor-valued constitutive equations, which are common in the field of continuum mechanics.

An inexpensive, non-toxic sample of a non-Newtonian fluid sometimes known as oobleck can be made very easily by adding corn starch (cornflour) to a cup of water. Add the starch in small portions and stir it in slowly. When the suspension nears the critical concentration - becoming like single cream (light cream) in consistency - the so called "shear thickening" property of this non-Newtonian fluid becomes apparent. The application of force - f...
 
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Added By - 123
Subject - Material Science and Engineering
Document Type - Demonstration
Video Duration - 00:00:02
 
 
 

 

Title          
2D CFD Bullet in a Pipe 
   
 
Abstract    
This is not my video. I found it on the web. Thought it would be interesting to the community. This is a 2d CFD simulation of a supersonic bullet fired down a pipe, made using a special version of VH1 that can simulate flow around rigid objects.The solver is PPM-LR, piecewise-parabolic method (Collela & Woodward), with a Lagrangian remap.
 
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Added By - matlabuser
Subject - Aeronautics and Astronautics
Document Type -
Video Duration - 00:00:46
 
 
 

 

Title          
CFD simulation of vortex shedding @ Re=100 
   
 
Abstract    
Numerical simulation of vortex shedding in flow past circular cylinder at Re=100, plotted is the magnitude of the X-velocity component. At the end some passive actuation is imposed on the cylinder boundary, in the end the goal is to attenuate the vortex shedding using this jet.
 
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Added By - matlabuser
Subject - Aeronautics and Astronautics
Document Type -
Video Duration - 00:00:18
 
 
 

 

Title          
Theory of Lift Generation - Airfoil 
   
 
Abstract    

There have been varies theories explaining the production of lift by an airfoil. Interestingly, many rather most of these have been misconceived and hence are false. This lists the major theories proposed and the drawbacks they suffer finally leading to a correct acceptable theory.

A fluid flowing past the surface of a body exerts a force on it. Lift is defined to be the component of this force which is perpendicular to the oncoming flow direction.[1] It contrasts with the drag force, which is defined to be the component of the fluid-dynamic force  

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Added By - anandsaxena
Subject - Aeronautics and Astronautics
Document Type - White Board
Video Duration - 00:00:02
 
 
 

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