We’re putting the final touches on our new badges platform. Badge issuance remains temporarily paused, but all completions are being recorded and will be fulfilled once the platform is live. Thank you for your patience.

Ansys Learning Forum Forums Discuss Simulation Fluids AQWA Morison TUBE Elements on Cylinder Reply To: AQWA Morison TUBE Elements on Cylinder

Shuangxing Du
Ansys Employee

In your nodal coordinate defintion (Node#1 ~ Node#11) and the tube element definition,  the tubes' axial axis is on the mean water surface and  along x-direction.  

The force and moment are output with respect to the COG of the structure, i.e. (Xg, Yg, Zg).  If you want the moment to be output with respect to another reference point, i.e. (Xr, Yr, Zr),  please manually do the calculation with the additional cross product term:

(Mrx, Mry, Mrz) = (Mx, My, Mz) + (Xr -Xg, Yr-Yg, Zr-Zg) x (Fx, Fy, Fz)

where (Mx, My, Mz) is the moment with respect to COG, (Fx, Fy, Fz) is the force with the respect to COG.

The translational drag and added mass coefficients can be input by CONT data record, see below and see 8.3. Geometric Property Data Record (ansys.com)

 

Â