Card 9 - ZONE_CONVECTION Thermal Convection Zone Definition

This optional card specifies the parameters and options for defining a boundary condition that creates a convection coupling between a group of selected elements and a fluid environment.

Parameters: KODE, N1, T1, T2, T3

KODE

KODE is the code ZONE_CONVECTION (or 92)

N1

N1 is the ZONE_CONVECTION card ID. Cards with the same ID reference the same Thermal Convection Zone.

T1

T1 specifies the type of parameter for the thermal convection zone.

T1 = FACTOR

T1 = FACTOR (or 11) An area correction factor is specified. This input corrects the convective area.

  • If the area correction factor is constant, then its value is specified in T2.
  • If the area correction factor is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g., T25) where n is a table number referencing the TABTYPE and FIELDTYPE cards. The dependent variable on the TABTYPE card must be NUMBER.
  • If the area correction factor is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g., E25) where n is an expression number referencing the EXPRESSION card.

T1 = HTC

T1 = HTC (or 5) A heat transfer coefficient for the convection between the selected elements and the fluid environment is specified.

  • If the heat transfer coefficient is constant, then its value is specified in T2.
  • If the heat transfer coefficient is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g., T25) where n is a table number referencing the TABTYPE or FIELDTYPE cards. The dependent variable on the TABTYPE card must be COND.
  • If the heat transfer coefficient is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g., E25) where n is an expression number referencing the EXPRESSION card.

T1 = HTFL

T1 = HTFL (or 8) A heat flux is specified for the thermal convection zone.

  • If the heat flux is constant, then its value is specified in T2.
  • If the heat flux is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g., T25) where n is a table number referencing the TABTYPE or FIELDTYPE cards. The dependent variable on the TABTYPE card must be HTFL.
  • If the heat flux is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g., E25) where n is an expression number referencing the EXPRESSION card.

T1 = MAT

T1 = MAT (or 2) The material ID of the primary fluid environment is specified in T2.

T1 = MAT_LIST

T1 = MAT_LIST (or 7) Additional fluid materials are defined. The ID of the MATLIST card, which lists these additional fluid materials, is specified in T2.

T1 = NAME

T1 = NAME (or 6) The load name is specified in T2.

T1 = PRESSURE

T1 = PRESSURE (or 3) A pressure is specified for the thermal convection zone.

  • If the pressure is constant, then its value is specified in T2.
  • If the pressure is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g., T25) where n is a table number referencing the TABTYPE or FIELDTYPE cards. The dependent variable on the TABTYPE card must be PTOTAL.
  • If the pressure is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g., E25) where n is an expression number referencing the EXPRESSION card.

T1 = ROT_FX

T1 = ROT_FX (or 6) The thermal convection zone temperatures are corrected for rotational effects. The ID of the referenced ROT_FX cards is specified in T2.

T1 = SELECTION

T1 = SELECTION (or 1) The thermal convection zone is applied to a selection of elements that are represented by the group name T2.

T1 = TEMPERATURE

T1 = TEMPERATURE (or 4) A temperature is specified for the fluid environment.

  • If the temperature is constant, then its value is specified in T2.
  • If the temperature is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g., T25) where n is a table number referencing the TABTYPE or FIELDTYPE cards. The dependent variable on the TABTYPE card must be TEMP.
  • If the temperature is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g., E25) where n is an expression number referencing the EXPRESSION card.

T1 = THICK

T1 = THICK (or 10) The area for internal edges is specified. This input is used to compute the convective area when the Thermal Convection Zone is applied to internal edges.

  • If thicknesses are subtracted, then T2 = SUB.
  • If thicknesses are added, then T2 = ADD.

T1 = OVERRIDE

T1 = OVERRIDE (or 12) An area override is specified. This input overrides the convective area.

  • If the area override is constant, then its value is specified in T2.
  • If the area override is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g., T25) where n is a table number referencing the TABTYPE and FIELDTYPE cards. The dependent variable on the TABTYPE card must be NUMBER.
  • If the area override is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g., E25) where n is an expression number referencing the EXPRESSION card.

T1 = ADIABATIC_WALL_TEMP_FOR_HTC

T1 = ADIABATIC_WALL_TEMP_FOR_HTC (or 14) Specifies how an adiabatic wall temperature for heat transfer calculations is defined in T2.

  • T2 = TEMPERATURE: Specifies a value for an adiabatic wall temperature.
  • T2 = AUTOMATIC: An adiabatic wall temperature value is computed by the thermal solver. If T2 = AUTOMATIC, the thermal solver computes the adiabatic wall temperature and uses it in heat transfer calculations as follows: where:
  • Ts is the static temperature.
  • RF = Pr1/2film is the recovery factor that is computed by the thermal solver, or can be specified in RECOVERY_FACTOR.
  • Pr is the Prandtl number calculated at .
  • vrel = abs(u - vϕ) is the relative tangential velocity, where u is a wall velocity and vϕ is a swirl velocity.
  • Cp is the specific heat at the fluid temperature Tfilm.

T1 = WALL_TEMP

T1 = WALL_TEMP (or 16) Specifies a value for an adiabatic wall temperature in T2.

  • If the adiabatic wall temperature is constant, then its value is specified in T2.
  • If it is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g., T25) where n is a table number referencing TABTYPE or FIELDTYPE cards. The dependent variable on the TABTYPE card must be NUMBER.
  • If the adiabatic wall temperature is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g., E25) where n is an expression number referencing EXPRESSION card.

T1 = RECOVERY_FACTOR

T1 = RECOVERY_FACTOR (or 15) Specifies a value for the recovery factor, which is used to compute the adiabatic wall temperature, in T2.

  • If the recovery factor is constant, then its value is specified in T2.
  • If it is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g., T25) where n is a table number referencing TABTYPE or FIELDTYPE cards. The dependent variable on the TABTYPE card must be NUMBER.
  • If the recovery factor is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g., E25) where n is an expression number referencing EXPRESSION card.

Code example

$ Thermal Convecting Zone(1)
NAME2 Thermal Thermal Convecting Zone(1)
NAME Thermal 328 345 1
ZONE_CONVECTION 1 SELECTION "Thermal Convecting Zone(1)"
ZONE_CONVECTION 1 MAT 2
ZONE_CONVECTION 1 PRESSURE 2.000000E+03
ZONE_CONVECTION 1 TEMPERATURE 1.0 T16
ZONE_CONVECTION 1 HTC 1.0 T8
ZONE_CONVECTION 1 HTFL 1.0 T8
ZONE_CONVECTION 1 ROT_FX 1