Shell Energy Source External#

Shell Energy Source Viscous External = {model_name} <float_list>

Description / Usage#

This card activates a heat source (or sink, as it were) in the shell_energy equation which corresponds to a user-supplied or constant value. Two models are available.

CONSTANT

This model invokes a constant heat source term (heat sink if negative) in units of energy per area per time.

  • <float1> - Value of heat source.

JOULE

This model invokes a constant energy source which is determined by an external current density field of the form

Qjoule = hξ J ⋅ J. Here J is the current density, h is the gap, and is the electrical resistivity, or the inverse conductivity. Both h and ξ are determined from other models in the material file. J is brought in as an external field variable from another exodusII file (see discussion below).

  • <float1> - Scale factor, usually set to 1.0.

JOULE_LS

This model differs from JOULE only in that the electrical conductivity is pulled out and must be specified with a LEVEL_SET model. This model is not well tested (PRS 12/14/2012)

  • <float1> - Scale factor, usually set to 1.0.

Examples#

Following is a sample card:

Shell Energy Source External = JOULE {scale=1.0}

Technical Discussion#

To bring in an external field of the appropriate form, see the main Goma user’s manual and refer to the External Field card. As an example, you might consider solving a simple electrostatic problem using the EQ = V (voltage) equation and output the magnitude of the current density vector. In Goma, this is done with the post processing

Electric Field Magnitude = yes

Card. This card outputs this J-magnitude as the exodusII variable EE. You then bring it in as follows in the input script:

External Field = EE Q1 current_dens_out.exoII

With the JOULE model, this field is used to compute the Joule heating term.

References#

No References.