Hello everyone,

I am currently working on a riser with a vertical and horizontal part (L-shape) submerged nearly completely in seawater. the whole horizontal part (at -68m) is submerged while the non-submerged vertical part's length is 20m.

The wave theory proposed by Caesar following the water depth is the Stream function 9th order.
Water Depth = 70m
Hmax= 35m
Tp=20.2s

For the current, I have the following data:
Vc(depth = 0m) = 1.5 m/s
Vc(depth = 35m) = 0.9 m/s
Vc(depth = 70m) = 0.4 m/s

The problem I've got is that even though I'am lowering the current velocity by 1/2 (to lower my stresses), the total particle velocity is not changing at all at some parts of my riser...(the horizontal part especially). I would like to understand why?

Consequently, the resulting stresses are the same at the horizontal section even though the current velocities used are different, which does not make sense. Do you have an idea why?

Best regards,

Open a Support Request on Smart Support and send in the model so Tech Support can look at it.

Hello,
Thanks for the advice, I am getting in touch with them.

Can you please tell me what the actual difference between the "stream function" and the "stream function modified" with their respective equations?

Best regards,