Mooring chain drag coefficient

[marinepete]

I'm trying to get an idea of the forces that an offshore anchor chain experiences in currents. To give an idea of size, the chains are up to 100 kg/m.

If anyone knows approximate drag coefficients or would like to have a guess(!) then it'd be very much appreciated!!

Thanks,
Peter

 

[VoyageofDiscovery]

Hi marinepete,

This would probably depend on the geometry of the link itself, ie. diameter of steel vs apperture. That being said, Cd of 1.0 is a good start for most cases in areas outside overlapping links and 1.5 for areas of overlap.

Regards

VOD

 

[GregLocock]

Yes, 1 is great place to start. Not many (?any) bluff bodies are worse than that - maybe that's the definition of a bluff body!



Cheers

Greg Locock

 

[marinepete]

Thanks for your replies!

I assume this would be non-dimensionalised with respect to the projected area of the chain? I better get calculating!

Cheers,
Peter

 

[GregLocock]

Yes, force = 1/2*Cd*A*v^2*density, in the right units.



Cheers

Greg Locock