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*HEAT TRANSFER
Transient or steady-state uncoupled heat transfer analysis.

This option is used to control uncoupled heat transfer for either transient or steady-state response.

Products: Abaqus/Standard  Abaqus/CFD  Abaqus/CAE  

Type: History data

Level: Step

Abaqus/CAE: Step module

References:

Required parameters to activate an Abaqus/CFD solid heat transfer analysis: 

CENTERING

Set CENTERING=ELEMENT to select an element-centered heat transfer analysis.

TYPE

Set TYPE=THERMAL FLOW to indicate a heat transfer analysis using Abaqus/CFD.

Optional parameters:

DELTMX

This parameter applies only to Abaqus/Standard analyses.

Set this parameter equal to the maximum temperature change to be allowed in an increment during a transient heat transfer analysis. Abaqus/Standard will restrict the time step to ensure that this value will not be exceeded at any node (except nodes whose temperature degree of freedom is constrained via boundary conditions, MPC's, etc.) during any increment of the step. If the DELTMX parameter is omitted, fixed time increments will be used.

END

This parameter applies only to Abaqus/Standard analyses.

Set END=PERIOD (default) to analyze a specific time period. Set END=SS to end the analysis when steady state is reached.

This parameter is relevant only for transient analysis.

STEADY STATE

Include this parameter to choose steady-state analysis. Transient analysis is assumed if this parameter is omitted. If this parameter is used in an Abaqus/CFD solid heat transfer analysis, the values given on the data line are ignored.

Optional parameter for cavity radiation analysis: 

MXDEM

This parameter applies only to Abaqus/Standard analyses.

Set this parameter equal to the maximum allowable emissivity change with temperature and field variables during an increment. If this value is exceeded, Abaqus/Standard will cut back the increment until the maximum change in emissivity is less than the specified value. If this parameter is omitted, a default value of 0.1 is used.

Data line to control incrementation and steady-state conditions in a pure heat transfer analysis: 

First (and only) line:

  1. Initial time increment. If automatic incrementation is used, this should be a reasonable suggestion for the initial increment size and will be adjusted as necessary. If direct incrementation is used, this will be the fixed time increment size.

  2. Total time period. If END=SS is chosen, the step ends when steady state is reached or after this time period, whichever occurs first.

  3. Minimum time increment allowed. If Abaqus/Standard finds it needs a smaller time increment than this value, the analysis is terminated. If a value is given, Abaqus/Standard will use the minimum of the given value and 0.8 times the initial time increment. If no value is given, Abaqus/Standard sets the minimum increment to the minimum of 0.8 times the initial time increment (first data item on this data line) and 1×10-5 times the total time period (second data item on this data line). This value is used only for automatic time incrementation.

  4. Maximum time increment allowed. If this value is not specified, no upper limit is imposed. This value is used only for automatic time incrementation.

  5. Temperature change rate (temperature per time) used to define steady state; only needed if END=SS is chosen. When all nodal temperatures are changing at less than this rate, the solution terminates.

Data line to define an Abaqus/CFD solid heat transfer analysis (TYPE=THERMAL FLOW): 

First (and only) line:

  1. Fixed time increment. This value sets a fixed time increment to be used throughout the analysis.

  2. Total time. This value sets the total duration of the analysis.