How multiple models are created, and how do I set the model to be massless shell elements, like Shell/Surfaces in ABAQUS??
What do you mean by multiple models ? Multiple connected parts ?
Shell/membrane elements with very low density ?
Thank you for your reply. I have solved the first problem. About the second problem,I am confused about the massless surface shell mentioned in the article. It is of TYPE shell elements (*SHELL SECTION) or surface (*SURFACE)?
(Article name:A FLUID-STRCUTURE INTERACTION MODEL ON THE HYDROELASTIC ANALYSIS OF A CONTAINER SHIP USING PRECICE )
The third question is: how to achieve rigid coupling of all 6 degrees of freedom between the surface and the reference point? Currently, the Kinematic coupling I found in the manual can only achieve rigid fixation of 3 degrees of freedom,(such as :Kinematic,1,3).
About the 2nd problem，the expression in ABAQUS is shown in the figure.
Yeah, Abaqus has surface elements but CalculiX doesn’t support them. Only shell or membrane elements are available and can be made almost massless using very low density for their material definition and very low thickness for their section.
Rigid body constraint is the easiest way.