I am runnin simulations for heat transfer analysis counting conduction, when I add the effect of surface radiation to environment with *radiate or *sradiate , I am getting the error message:
***WARNING: Temperature at 1 nodes has fallen below absolute zero. Increment
will be attempted again with a new time increment. The nodes have
been identified in node set WarnNodeTempBelowZeroStep2Inc45.
CONVERGENCE CHECKS FOR EQUILIBRIUM ITERATION 1
AVERAGE HEAT FLUX 1.78 TIME AVG. HEAT FLUX 2.75
LARGEST RESIDUAL HEAT FLUX 7.470E-07 AT NODE 60122 DOF 11
LARGEST INCREMENT OF TEMP. 3.352E-02 AT NODE 60122 DOF 11
LARGEST CORRECTION TO TEMP. -6.868E-05 AT NODE 60122 DOF 11
THE HEAT FLUX EQUILIBRIUM EQUATIONS HAVE CONVERGED
MAXIMUM NON-PRESCRIBED INCREMENT IN TEMPERATURE IS 3.352E-02
TIME INCREMENT MAY NOW INCREASE TO 6.371E-05
***WARNING: TEMPERATURE AT NODE 3 (-1.50112E-03) HAS FALLEN BELOW ABSOLUTE
ZERO (0.0000). INCREMENT WILL BE ATTEMPTED AGAIN WITH A TIME
INCREMENT OF 1.59273E-05
***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT
Did anyone experience that problem, please help me?
My initiol condition is 373 K at each node, so negative temperature values at nodes are nonsense.
Thanks
Emrecan Soylemez