Author Topic: Error: Cannot calculate total enthalpy  (Read 1103 times)

Offline pitney1

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Error: Cannot calculate total enthalpy
« on: May 11, 2012, 10:27:07 PM »
For a case with more than one continuous phase, the CFX Solver stops right at the start of the calculation with the following error:

Cannot calculate total enthalpy.
| Writing crash recovery file |

| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine CAL_ENTHTOT |
| |
| |
| |

Offline william

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Re: Error: Cannot calculate total enthalpy
« Reply #1 on: May 11, 2012, 10:28:18 PM »
CFX-Pre is not using the correct logic to determine whether or not a Total Temperature (Inlet) or Opening Temperature (Opening) should be permitted. The solver does not support Opening boundary conditions with an Opening Temperature set, or Inlet boundary conditions with a Total Temperature set, for multiphase cases with more than one continuous fluid, where the density of the continuous phases is not constant. CFX-Pre allows this setup, however, and the error above is the result.

CFX-Pre also disallows the use of Total (or Opening) Temperature for single-phase cases with thermal energy and a constant density fluid, when the solver does support this condition.

In general, Total (or Opening) Temperature should be permitted in the following situations:
1) the simulation uses the thermal energy or total energy model, and
2) it is single phase OR multiphase with only one continuous phase OR multiphase with constant density fluids.

There are some additional restrictions which apply for real gases.

Use a Static Temperature setting instead of an Opening or Total Temperature.