Reynolds number - Characteristic dimension

AI Thread Summary
Reference tables for characteristic dimensions used in calculating the Reynolds number for various shapes are sought for estimating drag coefficients in ballistics. The discussion emphasizes the importance of accurate characteristic dimensions to improve drag coefficient estimations for different bullet shapes. While some users suggest searching online for existing resources, the need for specific and reliable tables remains. The conversation highlights the intersection of fluid dynamics and ballistics, focusing on enhancing calculations through better data. Accessing comprehensive reference materials is essential for advancing research in this area.
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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