General Mechanical

General Mechanical

Element type 1 is not the same shape as FLUID220

    • seckin


      I am trying to simulate underwater modal analysis. But i have a problem which is "Element type 1 is not the same shape as FLUID220"

      What is the problem and how can i solve the issue?

      The 2 below are my inputs as command

      Best Regards


    • Rohith Patchigolla
      Ansys Employee

      Hello Seckin,

      From element documentation for FLUID220 and FLUID221 in ANSYS help, you can see that FLUID220 is a 20-node hex where as FLUID221 is a 10-node tet.


      This error means that you are trying to switch a tet (SOLID187) to a hex (FLUID220).

      Please check what kind of elements the body contains. If it contains only tets, change et,matid,220 to et,matid,221

      Hope this helps.

      Best regards,



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