15.4. CEL Functions with Multiphase Flow

Note:  These functions are available in CFX-Pre and CFX-Solver without restrictions, and in CFD-Post with the restriction that you cannot use short names.

If the function is fluid-specific, various behaviors are possible depending on the function type:

  • For massFlow and massFlowAve, if the phase name is not specified for the function, then the bulk mass flows will be used. See cases 1 to 7 in the table below.

  • For other fluid-specific functions:

    • if a fluid-specific operand is specified and no fluid is specified for the function, then the fluid specified for the operand will be assumed for the function as well. See case 8 in the table below.

    • if the function is specified and no fluid is specified for the operand, then the fluid specified for the function will be assumed for the operand as well. See cases 7 and 9 in the table below.

  • If both the function or operand are fluid-specific, and a phase name is not given for either, the solver will stop with an error. See case 10 in the table below.

Table 15.3: CEL Multiphase Examples

Case

CEL Function - Multiphase

Behavior

1

massFlow()@inlet

Bulk mass flow rate through inlet

2

Air.massFlow()@inlet

Air mass flow rate through inlet

3

massFlowAve(Pressure)@inlet

Bulk mass flow averaged pressure on inlet

4

Air.massFlowAve(Pressure)@inlet

Air mass flow averaged pressure on inlet

5

massFlowAve(Air.Volume Fraction)@inlet

Bulk mass flow averaged air volume fraction on inlet

6

Air.massFlowAve(Air.Volume Fraction)@inlet

Air mass flow averaged air volume fraction on inlet

7

Air.massFlowAve(Volume Fraction)@inlet

Same as Air.massFlowAve(Air.Volume Fraction)@ inlet

8

massInt(Air.Volume Fraction)@domain1

Same as Air.massInt(Air.Volume Fraction)@ domain1

9

Air.massInt(Volume Fraction)@domain1

Same as Air.massInt(Air.Volume Fraction)@ domain1

10

massFlowAve(Volume Fraction)@inlet

Error because no fluid specified