DesignModeler and SpaceClaim Direct Modeler are the Ansys tools used to create geometry for hydrodynamic systems. For information on importing geometry created in DesignModeler or SpaceClaim Direct Modeler, see the Attach Geometry section. When using either of these tools to define the geometry, there are a number of aspects that you should consider to ensure that your model is suitable for analysis with Aqwa, such as:
The waterline must lie at Z = 0 on the XY plane. Import or create each structure, then use Translate or Move operations to set the correct draft or depth for each structure.
When using lines to create beams, only tubular sections are supported in Aqwa. All other sections will result in a slender tube element being formed and you will need to define additional information in the Aqwa application.
Each vessel/structure should be a part, so all the bodies that you have should be grouped via the multibody part facility.
The model is oriented with its Z axis vertical up.
External surfaces must have normals pointing outward.
Internal Tank surfaces must have normals pointing inward.
Moonpool wall surfaces must have normals pointing inward, towards the enclosed fluid volume.
The matching surface that corresponds to the hole in the hull should have its normal pointing upward (towards the enclosed sea surface so that
.
>0).The free surface (which is the area where the sea surface would cross the Moonpool at the waterline z=0) should have its normal pointing upwards (away from the enclosed sea surface so that
.>0).
Hydrodynamic analysis systems only process the Line Bodies and Surface Bodies in a geometry. You can attach a geometry that has no Line Bodies or Surface Bodies, but note that this is not appropriate for an Aqwa analysis.