Bulk Data Entry Defines Free convection via automatic generation of free convection entries. This entry also supports subcase-dependent free convection.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
+ TID_AMB                


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CONVG 12 ELEM 21 1 20.0 30.0      


Field Contents SI Unit Example
ID Unique identification number.

No default (Integer > 0)

TYPE Entity used to identify Convection surfaces.
Convection surface is identified via Element ID defined on the SID field.
Convection surface is identified via Surface (SURF) ID on the SID field.

No default

SID If TYPE field is set to ELEM, SID represents an element ID.

If TYPE field is set to SURF, SID represents a SURF ID.

No Default (Integer > 0)
SIDE If TYPE field is set to ELEM, then SIDE represents the Element Side identification number. 5 It is mandatory to define the element side ID if TYPE field is set to ELEM.

Default = blank (Integer)

TEMPAMB Ambient point temperature.

Default = 0.0 (Real > 0.0)

HTC Free convection Heat Transfer Coefficient.

Default=0.0 (Real)

TID_HTEMP Temperature-dependent Heat Transfer Coefficient defined via TABLEMi or TABLEMGi Bulk Data Entries.

Default = Blank (Integer > 0)

TID_HTIME Time-dependent Heat Transfer Coefficient defined via a TABLEDi Bulk Data Entry.

Default = Blank (Integer > 0)

TID_AMB Time-dependent Ambient point temperature defined via a TABLEDi Bulk Data Entry.

Default = Blank (Integer > 0)



  1. The CONVG Bulk Data is an automatic method to define a free convection setup. The free convection entries such as CHBDYE, PCONV, CONV, SPC, and any corresponding GRID entries are automatically generated internally. PARAM, CONVG, YES can be used to output a separate *_CONVG.fem file which contains the internally generated entries coming from CONVG.
  2. The CONVG Bulk Data Entry is supported for the following solutions:
    1. Linear Steady-state Heat Transfer
    2. Linear Transient Heat Transfer
    3. Nonlinear Steady-state Heat Transfer
    4. Nonlinear Transient Heat Transfer
    5. Defining free convection in a Forced convection analysis via Darcy flow.
    CONVG entry cannot be defined in addition to CONV Bulk Data. Therefore, CONVG entry is not supported in conjunction with CAFLUID forced convection.
  3. The CONVG Bulk Data should be referenced by a corresponding CONVG Subcase Information Entry.
  4. Multiple CONVG Bulk Data Entries can be referenced on a CNVGADD Bulk Data Entry.
  5. Refer to comments on the CHBDYE Bulk Data Entry for Element Side identification numbers.