Heave and pitch for a moving boat, Ansys Hydrodynamic Diffracion

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  • Last Post 12 June 2019
Jafar posted this 07 June 2019

Hello, 

I'm trying to simulate a moving boat (high-speed planing hull) on AQWA to obtain the periodic motions in the heave and pitch directions when moving through regular head sea waves. First of all, is this the right platform? because I read somewhere online that it is used to simulate stationary objects not moving. Secondly, if it is not possible in AQWA can I do it in CFX? can anyone please suggest a method to do this.

Thanks a lot.

Jafar 

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SandeepMedikonda posted this 07 June 2019

What version are you using? If you are using let's say 192, can you run the following command in a command prompt and paste the output here:

"%AWP_ROOT192%\..\Shared Files\Licensing\Winx64\ansysli_util" -checkout AQWAWAVE  

Of course, if you are running a different version please change %AWP_ROOT192% according

Jafar posted this 09 June 2019

u:\>"%AWP_ROOT180%\..\Shared Files\Licensing\Winx64\ansysli_util" -checkout AQWAWAVE

AQWAWAVE OUT id=Boveytracey_campus_unn_ac_uk-SYSTEM-3468-032130 shared_info=Boveytracey_campus_unn_ac_uk-SYSTEM-3468-032131 is_sharable=yes server=2325@boveytracey is_academic=yes has_academic_logo=yes max_h_elem=0 max_nodes=0 max_faces=0 max_bodies=0

        Resolved by Feature: id=178 feature=aa_r product=ANSYS Academic Research Mechanical and CFD

Jafar posted this 09 June 2019

Please see above the output. Please note that I'm using version 18.0

Could you please advise on how to predict the heave and pitch motions of a planing hull advancing with a speed over regular sea waves through Hydrodynamic Diffraction or CFX?

many thanks.

pjschofi posted this 11 June 2019

Aqwa was not designed to analyze planing hull forms, there is a limit to the speed of the vessel that can be accommodated. Use of a CFD solution is recommended.

pgl posted this 12 June 2019

Here's a useful video showing the full CFD approach to model the waves: 

Also check out this thread, Raul who's active on this community my chime in here:  

https://studentcommunity.ansys.com/thread/cfd-tutorial-for-flow-around-ships/ 

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