理想気体の圧力

[fkawasim]

理想気体が温度が0ケルビンではないのに圧力がゼロｋPaになっています。なぜでしょうか？

[Chris Quan]

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).