Product(s):	SACS
Version(s):	ALL
Area:	Seastate

Community Question:

Hello Bentley I'm working on an in-place analysis and I have two scenarios:

In the first test, I've set the wave and current into one load condition while in the second test, I've set the wave and current in separate load conditions

But, we found that there is a significant difference between the two calculation results. The first test wave add current is 6865kN and the second test wave add current is 5464kN

Answer:

This is because the Morrison equation is non-linear. When you create a load case with current + wave, the velocity of the water is calculated as the sum of the wave velocity + current velocity. However, the force generated scales with the function of the absolute value of velocity times velocity (|V|V). On the other hand, when you add up the wave and current separately
the velocity is the root of this difference.