{"id":283699,"date":"2023-05-12T15:28:30","date_gmt":"2023-05-12T15:28:30","guid":{"rendered":"\/forum\/forums\/reply\/283699\/"},"modified":"2023-05-12T15:28:30","modified_gmt":"2023-05-12T15:28:30","slug":"283699","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/283699\/","title":{"rendered":"Reply To: Ansys AQWA-How to add fins for damping at our offshore marine structure?"},"content":{"rendered":"

<p>Hi Greg,<\/p><p>You can make the non-diffracting panels larger by: splitting the body in SpaceClaim into diffracting and non-diffracting surfaces (i.e. on the XY plane), re-importing the geometry into Aqwa, adding a Mesh Sizing control to the Mesh, and scoping this to the non-diffracting surfaces.<\/p><p>However… the non-diffracting elements do not add to the computational cost of the diffraction analysis, and increasing their size may reduce the accuracy of stability\/time domain Hydrodynamic Response analyses, so I wound not recommend this unless you are exceeding the solver limit on the total number of panels. For your simple cylindrical structure I would not expect you to need lots of elements to get an accurate solution.<\/p><p>To check the proportion of elements that are failing the mesh quality checks: once you have turned on ‘Ignore Modelling Rule Violations’, when you run the diffraction analysis, the Aqwa solver will output a message like:<\/p><p>14 MODELLING RULE #1 VIOLATIONS IGNORED BY GOON OPTION.<\/p><p>This number (e.g. 14) should be compared to the number of External Surface Diffracting Elements which is shown in the Mesh details.<\/p><p>Cheers, Mike<\/p><\/p>\n","protected":false},"template":"","class_list":["post-283699","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t