Computational Engineering International
Original slides based on Bill Dunn’s Streamline
Analysis Training (April 2011)
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Streamline - single time
Pathline - transient
Node Track - point parts
Massed Particles - physics
Variable Track - transient data
• On the EnSight Server
• On the EnSight Client
• On the EnSight Server
• On the EnSight Client
• Cannot do server operations on a
particle trace
– Cannot clip
– Cannot count traces
– Cannot fail traces
– Cannot step through time
– Cannot freeze it
– Cannot measure it
– Cannot do statistics
– Cannot create plots
• File -- > Command
– test: trace_dump
• Text file, tabular data.
• Cannot analyze, communicate trace data
• Limited analysis with 3rd party software (Excel)
• Spreadsheet analysis?
• We want to analyze this data using the fundamental
capabilities already built into EnSight (calculator, coloring,
viewing, filtering, etc.
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An Integrated Python Script
Easy GUI
Flexible Options
Easily Customized
Bring Particle Traces back to
Server
• On the EnSight Server
• On the EnSight Client
Case Gold File
• CAN do server operations on a
particle trace parts
• CAN clip
• CAN count traces
• CAN fail traces
• CAN step through time
• CAN freeze trace parts
• CAN measure trace parts
• CAN do statistics
• CAN create plots
Text File Output
• Legacy Support
• Full-featured browser
• CSV Format
Case Gold Output
• Full-featured browser
• Case Gold API
• Permanence
• Automatically auto-loads as
second case
• EnSight ‘deep’ server particle
parts.
• Can compare traces from other
cases
Flexibility
• Choose your own re-sample rate
• The second case will show these
number of timesteps.
Flexibility
• Choose your velocity variable.
• Note currently only works with
nodal velocity variable
• Use ElemToNode calc function
to create nodal velocity var and
then re-create your traces
Flexibility
• Choose your scalar variable for
analysis along the streamline.
• This variable must have been
active at the time of the
creation of the trace.
– Activate the variable, create the
trace, export the trace: success.
– Create the trace, activate the
variable, export the trace: fail
Flexibility
• Write out additional point
measured data
• Can be read in later by adding
the .mea filename into a .case
file or putting the .mea filename
into the measured field.
Flexibility
• Optional Time Line Part
• Time Line part connects all
points at each timestep with a
line
• Only toggle this on if you are
releasing particles from line tool
Warning
• This script has only been tested
with one case loaded.
• It then creates a second case
using your trace geometry.
Second Case
• Creates and loads a second case
if you choose a case file prefix
Parts
• point parts and line parts if you
enter case file name
• Measured data - point parts,
only toggle on if you wish to
import measured data later
• Time Line part - Only toggle on if
emitted from the line tool
• Per Element
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Trace Number
Final Velocity
Final Distance
Final Time
Distance
Normalized Scalar Value
Max Scalar Value
• Per Node
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Velocity
Distance
Time
Ones
Scalar Value
• Per Element
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pTrace_number
pFinal_velocity
pFinal_distance
pFinal_time
pDistanceE
p<Varname>_Normalized
p<Varname>_Max
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pVelocity
pDistance
pTime
pOnes
p<Varname>
• Per element variables are useful for culling the traces using
EnSight’s failed element capability (filtering)
• Final variables are useful for seeing the end at the beginning
• Nodal values are useful for seeing the variable value’s change
spatially and temporally
• Trace number is a useful aid in following a trace from beginning
to end
• pOnes is useful for counting points or clip intersections
• CAN do server operations on a
particle trace parts
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CAN clip
CAN count traces
CAN fail traces
CAN step through time
CAN freeze trace parts
CAN measure trace parts
CAN do statistics
CAN create plots
1. Visualize final values at release point
2. Variable statistics over time
3. Particle count over time
4. Particle count by spatial locations over
time
• Where on Paddle 1
to release particles
so that they travel
the farthest or stay
in the flow the
longest?
• How to correlate release
point with duration or
distance traveled?
• How to step through
time?
• How to cull the traces?
• How to quantify data?
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Enter the values as shown
Click OK
Notice a new transient Case
Notice two new parts
Notice 8 new variables (starting
with ‘p’)
• Set time = 0
• Make Case 1 Client parts
invisible
• Color new Case 2 parts by
pFinal_time
• Make Only Paddle1 and Case 2
parts visible
• Make Case 2 point part to be
spheres
• Set time = last time
• Thicken up the case 2 lines
• Notice pFinal_time is constant
enabling you to visualize the
longest duration traces
• Step through time
• pFinal_time is a per element
variable.
• Use it to Fail (filter) traces with
Final Time less than 60.
• Animate these long lasting
traces to gain insight into their
longevity
• Now do the same analysis for
Final distance
• Where on Paddle 1 to release
particles so that they travel the
farthest or stay in the flow the
longest?
• Qualitative Answer: On the top
of the paddle along the outer
radius.
• What is the average particle
velocity versus time?
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Select the Case 2 particle point part
pV_mag = RMS(pVelocity)
pAvgVelocity = StatMoment(plist,pV_mag,1)
Selecting ‘1’ with StatMoment does the average (see User
Manual ch 4.3)
• Now plot the average velocity
• What is the average particle velocity vs. time?
• Answer: Calculate
average velocity of point
part over time and plot
it’s exponential decay.
• Particle trace stops when
particles reach nearly zero
velocity or they hit a surface
• How many particles are present
over time?
• The Python Script creates a
nodal pOnes variable that is 1.0
at every node.
• Simply select the particle point
part, and use StatMoment with
the 0 option (sum) to sum up
the pOnes for each point
• Count the number of particles
inside of radius 0.25 and plot
that number over time
• Interior cylindrical clip of point part – spheres
• pOnes = MakeScalNode
of constant equal 1.0
• Sum pOnes variable
• Count traces in space and time
• Cull traces using Fail (filter) by Elem Variable
• Trace statistics over time (max, min, mean, etc) of
velocity, distance, time
• Resampled time rate controlled by user
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Show traces in space and time
Step by step through time
Freeze time for one part
Color entire part by Final distance, velocity or time
Plot variables over time
Track traces by number from beginning to end
Show a rake time-line
Show final variable value at the release point
Read in several particle case files from different flow
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Step by step through time
Plots
Clips of new particle parts
Color by new variables
Show Final distance, velocity, or time
Output measured data to be used with other datasets
Output text csv data to be used in other analysis packages
Output a case gold file with new particle trace parts
• What is the highest temperature seen along a
particular distance?
• Correlation to a thermal imaging camera which
records the maximum temperature seen along a
given ray, for a particular distance.
• Utilize Streamline Analyzer with a fixed vector
field (1,0,0), and return back maximum
temperature seen by each streamline (ray) cast.
• Maximum
temperature
seen along a
particular
direction vector.
• Correlation to
thermal imaging
camera.
• If elemental data, use ElemToNode
to obtain nodal data first.
• Slooow for large number of traces
• Expects that you have only one
case, and then loads a second case
as case 2.
• A new particle trace tool which moves a particle trace
from the client to case files then imports the case file
has been demonstrated
• The new particle trace tool optionally outputs a text,
csv file and measured data files
• A new way of Analyzing, Visualizing and
Communicating particle trace data using the new
particle trace parts has been demonstrated