Learning Forum

[NavalArch]

Good day,

I've got an error indicating that " HYDRODYNAMICALLY INTERACTING STRUCTURES HAVE MOVED TOO FAR FROM ANALYSIS POSITION MOVEMENT EXCEEDS 75% STOPPED AT TIME = 0.00 ". I am looking for any help regarding to understand this error and how it could be solved. 

Thanks in advance.

 

[Ashish Khemka]

Hi,

 

 Try using the same node positions for both AQWA-LINE and LIBRIUM. It should be quite quick to change to see whether this solves the problem.

 

Regards,

Ashish Khemka

[NavalArch]

Hi,

Thank you for your response.

How is it possible to check if the same node positions are being used for the both?

[ChenXzhi]

Hi,

Did you solve this problem? I've met the same error.

Thanks!

[Yu Bi]

Hi, first of all, Time Response analysis uses the hydrodynamic coefficients calculated in the Diffraction analysis which is calculated based on the model-design position (position defined in the SpaceClaim/Design Modeller). The distance between the structures in a hydrodynamic interactive group will influence the hydrodynamic coefficients calculated. Therefore, if during time response analysis, the distance between the structures in a hydrodynamic interactive group becomes too far away from the initial model-design position where the hydrodynamic coefficients database are based on, the results may become very inaccurate. So, the program issued this error message. 

 

There was once a bug with the unit conversion during the distance check. Therefore, if you are using an old version of Aqwa (before 2022R2), please use meter, kg unit in the Aqwa to avoid the bug.

 

[ChenXzhi]

Hi,

Thanks for your reply!

Do you have more specific references about this error? Because I still don't know what this "ANALYSIS POINT" is or how "75%" is calculated. If the numerator of the "75%" is the distance between the gravity centers of two structures, what is the denominator?

Regards,

XianzhiChen

[Yu Bi]

Hi, Analysis points are the mesh nodes. The denominator is the original mesh node distance based on the model design position.