Card 9 - VOID_NONGEOM Void Non-Geometric Element Definition

This optional card defines a void non-geometric element that can be used as part of one or more thermal void zones.

Parameters: KODE, N1, T1, T2, T3

KODE

KODE is the code VOID_NONGEOM (or 90)

N1

N1 is the VOID_NONGEOM card ID. Cards with the same ID reference the same non-geometric element.

T1 = CAP_METHOD

T1 = CAP_METHOD (or 4) describes the capacitance method specified for the VOID non-geometric element. T2 may be:

  • NONE: The VOID non-geometric element has no capacitance.
  • SPECIFY_CAP: The VOID non-geometric element capacitance is explicitly defined. Its value is specified in a separate VOID_NONGEOM card with T1 = CAPACITANCE.
  • SPECIFY_VOL: The VOID non-geometric element capacitance is computed based on the volume of the element (specified in a separate VOID_NONGEOM card with T1 = VOLUME) and on the material properties (density and specific heat). The material ID is specified in a separate VOID_NONGEOM card with T1 = MAT.

T1 = CAPACITANCE

T1 = CAPACITANCE (or 3) defines a capacitance for the VOID non-geometric element.

  • If the capacitance is constant, then its value is specified in T2.
  • If the capacitance is table dependent, then T2 is a table multiplier, and T3 has the form Tn (e.g., T25) where n is the table number referencing TABTYPE and TABDATA cards. The dependent variable on the TABTYPE card must be CAP, and the independent variable can be either TEMP or TIME.
  • If the capacitance 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 an EXPRESSION card.

T1 = HEAT_LOAD

T1 = HEAT_LOAD (or 2) applies a heat load to the VOID non-geometric element.

  • If the heat load is constant, then its value is specified in T2.
  • If the heat load is table dependent, then T2 is a table multiplier, and T3 has the form Tn (e.g., T25) where n is the table number referencing TABTYPE and TABDATA cards. When the heat load is variable, the dependent variable on the TABTYPE card must be QNODE and the independent variable can be TEMP, or CAP, or TIME.
  • If the heat load 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 an EXPRESSION card.

T1 = MAT

T1 = MAT (or 1) defines the primary material of the void non-geometric element. Its ID is specified in T2.

T1 = MAT_LIST

T1 = MAT_LIST (or 7) specifies additional fluid materials. The ID of Card 9 - MATLIST Additional Fluid Material List - Optional, which lists these additional fluid materials, is specified in T2.

T1 = NAME

T1 = NAME (or 9) specifies the load name in T2.

T1 = REGION

T1 = REGION (or 8) specifies a void region which is attached to the void non-geometric element. T2 is the void region index (from 1 to 20), and T3 is the uid of that void region.

The contents of the void region will be written to the Card 9 - VOID_REGION Thermal Void Region Definition - Optional.

T1 = VOLUME

T1 = VOLUME (or 5) defines a volume for the void non-geometric element.

  • If the volume is constant, then its value is specified in T2.
  • If the volume 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 and TABDATA cards. The dependent variable on the TABTYPE card must be VOLUME, and the independent variable is TEMP or TIME.
  • If the volume 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 an EXPRESSION card.

Code example

VOID_NONGEOM 3 MAT 2
VOID_NONGEOM 3 HEAT_LOAD 1.000000E+07
VOID_NONGEOM 3 CAP_METHOD SPECIFY_CAP
VOID_NONGEOM 3 CAPACITANCE  1.000000E+10