Learning Forum

[Hilal Çelik]

 I give irregular waves with a spectrum and constant current to floating docks and analyzed with irregular wave response but, I have encountered the error of "HYDRODYNAMICALLY INTERACTING STRUCTURES HAVE MOVED TOO FAR FROM ANALYSIS POSITION MOVEMENT EXCEEDS 75% STOPPED AT TIME = 3817.25." How can I  solve it?

[Ingrid M]

Hello, 

During the simulation, your structures are moving too far from each other.

If this is  expected and want to allow this behaviour, a way to overcome this issue is to breakdowns your simulation so control how far your structure moves from simulation to simulation.

Your workflow could be as follow: you link back to back Time Response simulations components. 
Each Time Response corresponds to a simulation where the structures move from each other but not too far within a time range.
For instance, the first component corresponds to time=[T0, T1] where the structure moved from Pos(T0) to a new position at Pos(T1), 
then the second one, where the simulation starts at the position Pos(T1) and stops at T2, third one where the simulation starts at Pos(T2) and stops at T3, etc...

For each of these simulations, you need to run a Diffraction analysis with the structure in its new position (the one from Pos(T1), Pos(T2), etc...) to update the data base (HYD file). To move your structure to its new position, you can use a Part Transform.
You also need to make sure that your new Time Reponse simulation picks up the HYD file from its corresponding new Diffraction Analysis run. 
For this, you will need to write a pre-solve script to amend the location of the HYD file to consider.

I hope this helps.
Kind regards,
Ingrid