Reynolds number - Characteristic dimension

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SUMMARY

The discussion focuses on the need for reference tables that specify the characteristic dimensions of various shapes for calculating the Reynolds number, particularly in the context of ballistics. The user is seeking improved methods for estimating drag coefficients of bullet shapes using the Reynolds number as a foundational metric. While there is a wealth of information available online, specific resources or tables were not provided in the discussion.

PREREQUISITES
  • Understanding of Reynolds number calculations
  • Familiarity with fluid dynamics principles
  • Knowledge of drag coefficient estimation techniques
  • Basic concepts in ballistics and projectile motion
NEXT STEPS
  • Research reference tables for characteristic dimensions in fluid dynamics
  • Explore methods for calculating drag coefficients for various shapes
  • Study the impact of flow regimes on drag in ballistics
  • Investigate advanced fluid dynamics resources and publications
USEFUL FOR

Ballistics researchers, engineers in fluid dynamics, and anyone involved in the study of drag coefficients and Reynolds number calculations will benefit from this discussion.

tuoni
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Are there any reference tables for what to use as the characteristic dimension of various shapes when calculating the Reynolds number?

I am very interested in ballistics, and have done research and calculations for various ways of estimating the drag coefficient of various bullet shapes. I already have a somewhat crude approximation, but I wouldn't mind finding something better.

This time I have chosen to use the Reynolds number as the basis to estimate drag coefficients in various flow regimes, and try to continue from there.
 
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tuoni said:
Are there any reference tables for what to use as the characteristic dimension of various shapes when calculating the Reynolds number?

I am very interested in ballistics, and have done research and calculations for various ways of estimating the drag coefficient of various bullet shapes. I already have a somewhat crude approximation, but I wouldn't mind finding something better.

This time I have chosen to use the Reynolds number as the basis to estimate drag coefficients in various flow regimes, and try to continue from there.
There is lots of information like this online. Just Google.
 

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