How to define the surface of a fluid cavity using user elements?

Abhijith Thoopul Anantharanga @Abhijith-Thoopul-Anantharanga

23 March 2021 0 2K Report

I have a hollow cube with a cavity at the centre. This cavity should be filled with an incompressible liquid. When I use the fluid cavity constraint on abaqus and run my input file, I get a warning message:

***WARNING: ELEMENTS OF TYPE U1 CANNOT BE USED AS UNDERLYING ELEMENTS TO

DEFINE AN ELEMENT-BASED SURFACE.

I am using user elements to define this surface. Could someone please suggest how I can use these user elements to define the surface of the cavity?

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