Morison's equations for drag and inertia force

[Chrissy123]

Hi - I know that I can determine the coefficients for Cm and Cd using Keulegan Carpenter number but I have seen these equations for a Morison derivation of C and Cd - please see picture below - I'm an unsure though what is 'F' in the equation - what do I use for this please ? thanks,

 

[IRstuff]

Any reason why it wouldn't be Force?

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[Chrissy123]

Hi yes well it probably is Force but which Force ? How do I know what the Force is as so far for the problem that I have I've just calculated dynamic pressure along the length of the riser as it gets deeper into the ocean - so I don't know what Force to use

 

[IRstuff]

You use all of them; you segment the riser and apply the average force for that segment, or you integrate as indicated in the citation below.

http://web.mit.edu/13.42/

http://www/handouts/reading-morrison.pdf

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