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  3. Why am I getting a piston force with hsfld242 that is 1/3rd what I expect?

Why am I getting a piston force with hsfld242 that is 1/3rd what I expect?

Tagged: 14.5, fluids, hydrostatic, Mechanical APDL (f. ANSYS), modeling-and-meshing, structural-mechanics
    • January 25, 2023 at 7:34 am
      FAQFAQ
      Participant

      You need to define the negative fluid volume. (Structural Analysis Guide Section 18.4: Example model using hydrostatic fluid elements) Otherwise the fluid volume that is attached to the piston wall doesn’t change since it is attached to the non-moving mesh of the cylinder. A good convergence norm for this analysis is HDSP. Note that the volume of a cone is 1/3rd the volume of a cylinder of the same height and diameter so the conical fluid volume defined by the piston surface (which is moving) was 1/3rd the total and produced a force 1/3rd of the expected value.

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