Comparing Calculated Models to Real-Life Situations

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Discussion Overview

The discussion revolves around the comparison of calculated models of physical phenomena, specifically the behavior of water, to real-life situations. Participants explore the nuances of modeling water dynamics, including drop impacts and the properties that should be considered in such comparisons.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant inquires about videos comparing calculated models of water drops to real-life scenarios.
  • Another participant references MIT lectures that demonstrate comparisons between calculated values and real-world experiments, although the exact relevance to the original question is uncertain.
  • Several participants express the need for clarity regarding what specific properties of water are being modeled, questioning the vagueness of the original inquiry.
  • One participant suggests that the question likely pertains to modeling the physical behavior of water as done in graphics engines, but emphasizes the need for specificity in the properties of interest.
  • Another participant argues that without defining the physical quantities to be modeled, the inquiry lacks meaning and clarity.
  • A later reply highlights the complexity of accurately modeling water, suggesting that all relevant properties must be considered simultaneously.

Areas of Agreement / Disagreement

Participants generally agree that the original question lacks clarity and specificity regarding the properties of water to be modeled. However, there is disagreement on the tone and approach to addressing the vagueness of the inquiry.

Contextual Notes

The discussion reveals limitations in the original question, particularly the absence of defined measurable properties of water for comparison. The responses indicate a need for clearer communication in scientific inquiries.

Dr Max
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Hi :)

im wondering if there is a video where a calculated model and the same situation in reality gets compared ? :)
e.g. water drop, or something crashing with a certain speed :)

thanks for any help :)
 
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Walter Lewis's legendary mit introductory physics lectures contain a few demonstrations which he compares with the calculated value. I don't remember the exact lecture but in one he showed how the mass didn't affect a pendulum. There are others too like a weighing machine in free fall. While the lectures have been taken down from OCW you can find them on YouTube.Link: https://m.youtube.com/playlist?list=PLUdYlQf0_sSsb2tNcA3gtgOt8LGH6tJbr

Also: I don't think this is the correct forum topic you've posted under, although I'm not sure what the correct topic is either. :confused:
 
This is a nice one:

 
Dr Max said:
Hi :)

im wondering if there is a video where a calculated model and the same situation in reality gets compared ? :)
e.g. water drop, or something crashing with a certain speed :)

thanks for any help :)

Wait... isn't this what is done routinely in college physics experiments?!

Zz.
 
First thanks for all replies so far :)

Actually I was looking for calculated water vs real water, something like that. I just want to see how close to reality the best model gets right now. Whats the state of the art ? :)
 
Dr Max said:
First thanks for all replies so far :)

Actually I was looking for calculated water vs real water, something like that. I just want to see how close to reality the best model gets right now. Whats the state of the art ? :)

You are aware that in this post, you didn't state anything about what property that you want to measure, aren't you? "calculated water vs real water" is a "huh?"-type of statement. What exactly about the properties of water that you are trying to compare?

It usually saves a lot of time and effort on our part if you, from the get-go, be specific and clear, rather than produce a rather vague question and topic about a generic "calculated model".

Zz.
 
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Okay I am sry, I weren't aware of this problem. I do computer science :)

basically I am looking for a experimental setup, let's say a bowl of water Diameter 20 cm, the bowl is filled with exactly 200ml of water, 10 cm above the ground there is a pipet attached, the pipet will release a drop of the same volume everytime used. The moment when the drop hits the water is my point of interest.

And now I am looking for a video, that films this setup and compares it to the same situation but calculated in a computer visualized. How close does the computer model get ? I guess you would need to calculate all properties at once. As in reality properties are not isolated are they? :)

(it could also be a different setup, I am just curious about the quality of todays models)

I hope this specifies :) and we can now understand each other
thank you :)
 
Dr Max said:
Okay I am sry, I weren't aware of this problem. I do computer science :)

That's no excuse. What if I say "Hey Dr Max, I want you to write a program to be used for water." Would that make any sense to you on what you should do?

I bet not. You'd ask "OK, what do you want the program to actually do?"

That is essentially what you are asking here. But it seems that you are still not being clear, based on this:

basically I am looking for a experimental setup, let's say a bowl of water Diameter 20 cm, the bowl is filled with exactly 200ml of water, 10 cm above the ground there is a pipet attached, the pipet will release a drop of the same volume everytime used. The moment when the drop hits the water is my point of interest.

Here's the thing: What exactly are you trying to MEASURE? You've described the scenario, but you've never clearly indicated what actually are you interested in measuring? After all, we are talking about something quantitative, aren't we? You wanted to compare with this "physical reality", but yet, you never once stated what quantity we are trying to measure and compare!

This is what has been very puzzling in this entire thread.

Zz.
 
@ZapperZ , I think you're being a bit harsh here.

While I agree the actual question needs to be made clearer, I highly suspect this is a question about modeling the physical behavior of water, like so many graphics engine do, and what the difference to real water is.
 
  • #10
rumborak said:
@ZapperZ , I think you're being a bit harsh here.

While I agree the actual question needs to be made clearer, I highly suspect this is a question about modeling the physical behavior of water, like so many graphics engine do, and what the difference to real water is.

No, I don't think I'm being harsh. Modeling WHAT behavior of water? It's temperature? It's viscosity? It's volume? It's dynamics when it goes SPLAT? There isn't a single quantity that has been mentioned here that is of interest. You can't simply say "let's model water". This statement is meaningless. You have to list out the physical quantities that you want to model.

Zz.
 
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  • #11
ZapperZ said:
No, I don't think I'm being harsh. Modeling WHAT behavior of water? It's temperature? It's viscosity? It's volume? It's dynamics when it goes SPLAT? There isn't a single quantity that has been mentioned here that is of interest. You can't simply say "let's model water". This statement is meaningless. You have to list out the physical quantities that you want to model.

Zz.
You seem to be angry !
 
  • #12
wow, i never thought this would be such a touch thing :)

yes its about modelling. basically if you want to model corectly, closest to reality, you need to consider all properties at once don't you ? :)

I want to see a video, visual representation, light that hits my eyes reflected by the drop, dropping and splashing.
 
  • #13
Dr Max said:
I want to see a video...
I would try a search engine. Or forums related to computer graphics or fluid dynamics software.
 
  • #14
Dr Max said:
im wondering if there is a video where a calculated model and the same situation in reality gets compared ?

 

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