FAQ Structural Mechanics – Imported

FAQ Structural Mechanics – Imported

FAQ Import area. This is where our raw imported FAQ’s are imported to prior to editing and posting.

In Explicit Dynamics, why is the “Euler Cell Over Emptied” message issued?

    • Vishal Ganore
      Ansys Employee

      The Euler Cell Over Emptied warning message indicates that a large volume fraction of a material ( > 0.9) is being transported into or out of an Euler cell in a single time step. AUTODYN issues this message to notify the user of potential numerical error caused by transporting excessive material in a single time step. The following recommendations may help alleviate this issue. 1. Use Internal Energy Transport (Global -> Transport). The AUTODYN default is Total Energy Transport. However, in explosive detonation calculations where the detonation products escape into a void at high speed, a better result may be achieved using internal energy transport, because that approach provides a more accurate determination of the internal energy in a cell, which in turn is then used in the explosive equation of state. 2. Increase the minimum Euler density (Material -> Modify -> Cutoffs). The escaping detonation products are typically at very low density. It is useful to limit the diffusion of extremely small masses by increasing this cutoff value. 3.Use a Maximum velocity cutoff of approximately 10,000 m/sec. The predicted velocities of very small masses of material escaping into a void can sometimes be unrealistic. You can limit this behavior by setting the Maximum velocity cutoff using Global -> Cutoffs.

    • Vishal Ganore
      Ansys Employee

      In Explicit Dynamics, why is the "Euler Cell Over Emptied" message issued?

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