Learning Forum

[ashwin Gurjar]

Hello, I am using Ansys aqwa and finding out the hydrodynamic response of the structure having nonlinear catenary . When I set the use cable dynamic option to yes this error appears.Can someone help me to understand what does it mean ??

Error is
CABIN4:CONV.FAILED STAGE#6 - ERRN=2.21E-10 LINE#2 AFTER 500 ITERATIONS
CABIN4:CONV.FAILED STAGE#6 - ERRN=2.22E-10 LINE#3 AFTER 500 ITERATIONS

[Yu Bi]

Hi, those messages mean the calculation for the dynamic cables failed to converge. The reason for it could be the weight of the cable is too light. 

[ashwin Gurjar]

Hi, thanks for the reply

I increased the weigth of the cable and following error appears 

CABIN4:CONV. FAILED STAGE#1-DDNMAX= 5.3360 LINE#9

CABIN4:CONV. FAILED STAGE#1-DDNMAX= 5.2230 LINE#2

can you explian the reason behind this?

[Yu Bi]

CONV means converge. This error still means the cable you set failed to converge during calculation. The reason the error shows is that the rotation in normal direction between the nodes of the cable is too large in a time step. You can try to decrease your time interval for the analysis and also have a check if cable's properties have been set properly.