Advice for representing experimental data

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Discussion Overview

The discussion revolves around how to effectively represent experimental data from a fluid mechanics experiment involving gravity currents. Participants explore methods for visualizing velocity data collected from sensors, considering various approaches to present meaningful insights from the measurements.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant describes their experiment using UDVP and expresses uncertainty about how to visualize the velocity data meaningfully.
  • Another participant asks for clarification on what the fluid velocity was measured as a function of and what variables were varied in the experimental setup.
  • A participant suggests considering what information a typical reader might seek from the data and questions the purpose of multiple runs of the experiment.
  • There is a suggestion to plot the data in 3D using Excel, with positions as the x and y axes and velocity as the z axis, resembling a contour map.
  • Participants emphasize the importance of determining what aspects of the data are significant versus irrelevant.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants offer various suggestions and questions without agreeing on a single approach to data representation.

Contextual Notes

Participants have not fully clarified the specific variables measured or the details of the experimental setup, which may influence the data representation strategies discussed.

Who May Find This Useful

This discussion may be useful for students or researchers new to experimental fluid mechanics, particularly those seeking guidance on data visualization techniques and analysis methods.

RobosaurusRex
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Hi all,

I have recently done my first experiment in fluid mechanics, and it was a gravity current experiment using UDVP. I have augmented the data, as to remove noise, and performed the statistical analysis.

I have text files which contain the velocities measured by each sensor over the time period measured for. So I have 128 velocities measured over a distance in front of the sensor for each node. (then for each run of the experiment)

I am struggling with how best to use this velocity data to show anything meaningful, I am a newbie to this and I need some advice.
Any hints will be great, I need some idea of where to start and then I am sure that I can run with ideas from there.
I want to reconstruct the distance measured over and then look at the velocity profiles, but I am unsure of how to do this. Cheers!
 
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RobosaurusRex said:
Hi all,

I have recently done my first experiment in fluid mechanics, and it was a gravity current experiment using UDVP. I have augmented the data, as to remove noise, and performed the statistical analysis.

I have text files which contain the velocities measured by each sensor over the time period measured for. So I have 128 velocities measured over a distance in front of the sensor for each node. (then for each run of the experiment)

I am struggling with how best to use this velocity data to show anything meaningful, I am a newbie to this and I need some advice.
Any hints will be great, I need some idea of where to start and then I am sure that I can run with ideas from there.
I want to reconstruct the distance measured over and then look at the velocity profiles, but I am unsure of how to do this.Cheers!
What were you measuring the fluid velocity as a function of? What were you varying in the experimental setup?
 
berkeman said:
What were you measuring the fluid velocity as a function of? What were you varying in the experimental setup?
I measured the velocity at different positions down the flume
 
Perhaps ask yourself what information would a typical reader be looking for?

Why were multiple runs of the experiment performed? Would the reader be interested in differences between runs or just the average of the runs?

RobosaurusRex said:
I measured the velocity at different positions down the flume

Down and across or just down? Exel can plot 3D graphs if necessary. So you could plot a graph with x and y as position and z as velocity perhaps. Bit like a contour map?

http://spreadsheetpage.com/graphics/tips/surface2.gif

Only you can decide what's important and what's irrelevant.
 

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