/PRINT

Format

/PRINT/Nprint/N_line

Definition

Comments

1. If N_print is negative, the printout is made in the standard output, as well as in the output file. If N_print is positive, the printout is only made in the output file.

   The energy error in the Radioss Engine output file (_0001.out..._9999.out) is defined as:

   $$err\%=100\cdot \left(\frac{Ek+Ekr+Ei}{E{k}_1+Ek{r}_1+E{i}_1+Ewk-Ew{k}_1}\right)-1$$
   Where,

   $Ek$

   Kinetic energy

   $Ekr$

   Rotational kinetic energy

   $Ei$

   Internal energy

   $E{k}_1$

   Initial translational kinetic energy

   $Ek{r}_1$

   Initial rotational kinetic energy

   $E{i}_1$

   Initial internal energy

   $Ewk$

   External work

   $Ew{k}_1$

   Initial external work

   Hourglass energy is not included in internal energy.

   Normal amount of hourglass energy is about 10% to 15%.

   Hourglass energy is not a true energy error, but a part of internal energy computed with a non-physical equations. If this energy remains small, the assumptions concerning these equations are acceptable.

   Initial values are values at cycle zero and not at time zero.

   At time t=0, err% =0 the energy error is bounded at ± 99%.