Download - 23-Graphic Techniques Used in CFD
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Graphic Techniques Used in CFD
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Introduction Can you understand your results by looking at a
table of numbers on a computer screen ?
Computer graphics and computational flow
visualization provide powerful means of
examining results.
For examples
Contour plots can provide
a good means of assessing sharpness of shocks
for checking that there are no incorrect flow gradients next to
farfield boundaries.
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Introduction
Techniques xy Plots
Contour Plots
Vector and streamline Plots
Mesh Plots
Composite Plots
Animations
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xy Plots Some examples of xy plots
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xy Plots
Advantages
xy plots are the simplest and most straightforward
category of graphical representation of CFD results.
They are still remain the most precise quantitative
way to present numerical data on a graph.
Another person can readily read quantitative data from
curves on an xy plot without making any mental or arithmetic
interpolation.
Disadvantage
They do not illustrate the global nature of a set CFD
results all in one view.
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Contour Plots What is a contour line ?
It is a line along which some property is constant.
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Contour Plots Another type of contour plot is flooded contour.
Instead of illustrating flow with a discrete number of contour
lines, the regions between these lines are simply filled with a
color intensity that denotes the value of the flow-field property-
the regions between the lines are flooded with color intensity.
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Contour Plots
More examples of flooded contours
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Contour Plots Multizone three-dimensional contour plot
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Contour Plots In CFD, contour plots are one of the most commonly
found graphical representations of data.
The global nature of the flow is seen in one single view.
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Vector and Streamline Plots A vector plot is a display of a vector quantity at discrete grid points,
showing both magnitude and direction, where the base of each vector
is located at the respective grid point.
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Vector and Streamline Plots Illustrations of streamlines are excellent tools for examining
the nature of a flow.
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Vector and Streamline Plots More examples of streamline plots
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Mesh Plots
Mesh plots consist of lines connecting grid points in
either a two- or three-dimensional grid.
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Mesh Plots
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Composite Plots Many of the categories of different plots can be combined
into a single plot, called a composite plot.
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Composite Plots
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Animations