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Ansys Learning Forum › Forums › AIS Japan › 構造 › 理想気体の圧力 › Reply To: 理想気体の圧力

June 24, 2025 at 1:56 pm
Chris Quan
Ansys Employee

You need to set a non-zero initial internal energy at the material properties of air. This can be done in Engineering Data.

Autodyn or LS-DYNA solver will calculate air pressure from the specified internal energy through EOS (Equation Of State).

For air at room temperature, the initial internal energy is 2.068E5 J/Kg (energy per mass) or 2.53E5 Pa (energy per volume).