sliding contact in AQWA?

Hi all!

My name is HJ and I'm a ocean engineering student.

I have a simple question for AQWA users. Is there any sliding contact condition between two structures except FEND option in AQWA?

All the Best

 

I'm pretty sure that fender elements are the only way to implement sliding contacts in AQWA.

 

Thanks, CWTeebs.

That's only way to solve that problem.... then.. do anyone have the example about FEND option.
I have tried several times... but the fender doesn't work.... pass a structure through the fender.

 

Do you know how to use AQWA- Graphical Supervisor? That's the "native" AQWA interface. I've got a couple of jacket launch training files that use fenders to allow a riser jacket to slide from a barge.

CWTeebs

 

Wow!! Thanks again!!!

Yes, I mostly use the AQWA classic ver. to solve and post process than Workbench. Jacket training files would be a great help.

you can send it to:

hjkoh@jejunu.ac.kr

 

Run "ablaunch.dat" first which is the AQWA-LIBRIUM run and then ANLAUNCH which is an AQWA-NAUT time domain launch with fenders. Let me know if you have any questions.

CWTeebs

 

Thanks, CWTeebs.

It's very useful docu. and I understood how fender generate. However, there is one more question.
Do you know what this warning is?

**** WARNING **** HYDRODYNAMICALLY INTERACTING STRUCTURES HAVE MOVED TOO FAR FROM
ANALYSIS POSITION
MOVEMENT EXCEEDS 75%

 

That's curious, that technically should *not* be happening as the jacket is made of what amount to interconnected Morison elements, and the barge is supposed to be a hydrostatic model only. Hydrodynamic interaction comes from modeling bodies that radiate waves, and these waves add up to create a higher wave field in between, think of an oiler ship up alongside a nuclear aircraft carrier on a refueling mission.

So, the hydrodynamic radiation terms are calculated in AQWA-LINE at the mean position, so if they start to move from the design position in a time domain analysis this approximation is no longer valid.

I'll have to look into that further. I'll let you know what I find when I have a chance to look at the data files.

CWTeebs

 

Oops. sorry. The warning was came from my project which is the two body interaction problem(A main circular cylinder is in the hole of ring type sub structure).

 

No problem man. So, you're all set for now?

CWTeebs

 

Yes, thanks. I appreciate your help.

 

That sounds like a turret for an FPSO? What the heck are you simulating?

 

AQWA fender problem

I'm Pasquale. I have a problem with application of the fender between two floating bodies. I'm using AQWA software.
I put a fender inside of the structures, but I belive that it's wrong because in the window visualization (AQWA GS), appears strange.
In this case have been iserted also the moorings. For these I don't have problems.


I have also a problem with the solution because the calculation ends with error. The erros is:


**** ERROR **** HYDRODYNAMICALLY INTERACTING STRUCTURES HAVE MOVED TOO FAR FROM ANALYSIS
POSITION
MOVEMENT EXCEEDS 75%
STOPPED AT TIME = 0.00

I annex the text file "TimeResponse.dat", where, in the deck 14, there are the moorings and fender configurations.
You can see also an image where there are moorings and fender (you control fender).


Thanks!

 

I can't open your file, either as a .zip or .dat.

 

Sorry!

I annexed other file .zip.

Thanks for your interesting.