Learning Forum

[mishal.mohanlal]

Hi Guys

I am new to Ansys and looking into replicating one of my old simulations from another software on Ansys.

Please refer to the below image, I have a pontoon with a unit bouyancy force applied to it. The bouyancy force is linked to a table which is shown below the FEA model (there is a bunch of simulation setup procedures which I am not showing). The simaultion is performed using the nonlinear trnasient dynamic solver. There are no restraints on the model, however when the simulataion is run, the pontoon falls due to gravity and once it moves into the negative z region the bouyancy force is then activated since the values in the table are multiplied by the unit force resulting in a realistic bouyancy force being applied to the system.

How can this be acheived on Ansys mechanical?

[Erik Kostson]

 

This is from Strand7 – we do not have a similar easy way of doing this, but I would suggest to use AQWA for best solution.

The posted way shown above in the initial post, is not correct during the transient/time (it does not account for fluid added mass for one) and does only give some indication towards the final time results. USe AQWA for correct hydrodynamic and structural behaviour

 

[mishal0488]

I specifically wanted to use Ansys Mechanical and not AQWA, it was for a conference where presented a method to calculate the righting arm of a pontoon through the use of FEA software.

I managed to get the system working on Ansys Mechanical using some APDL code, have look at the link belo on Youtube

 

https://www.youtube.com/watch?v=2-d0GHYDsgw