calculate electric_resistance command

Purpose

This command calculates the electric resistance of a particle bed formed between two solid walls.

Warning

GPU support for this command has not been tested and may not work as expected.

Syntax

calculate electric_resistance keyword keyword/value pairs

Keywords

Description

id

user-assigned name for the calculate electric_resistance command

probes
obligatory, brace-enclosed list of mesh ids
available options: {mesh1,mesh2, ...}

reference
obligatory, id of the mesh that is used as reference

The keywords from the enable_electrical_conductivity command are also relevant for the calculate electric_resistance, except particle_group, which is always set to all, and enable_electric_heating, which is ignored by this command.

Examples

calculate electric_resistance id Ohmmeter probes {lower_battery} reference upper_battery
calculate electric_resistance id AnotherOhmmeter probes {batteryA, batteryB} reference battery_ref use_central_distance no hypre_full_output yes

Access the calculated values above via:

id_Ohmmeter.lower_battery or id_Ohmmeter[1]
id_AnotherOhmmeter.batteryA or id_AnotherOhmmeter[1]
id_AnotherOhmmeter.batteryB or id_AnotherOhmmeter[2]

Description

This command calculates the electric resistance of a particle bed confined between two solid walls: the probe wall and the reference wall. The probe and reference walls are specified using the probes and reference keywords, respectively. If more than one wall is specified by the probes keyword, a different computation is performed for each probe wall, and the corresponding results can be accessed as in the example above.

If the particle bed is confined by more than two walls, the calculated resistance is still the resistance of the bed between the probe wall and the reference wall. Thus, the electric resistance calculated by this command is a property of the trio formed by (i) the particle bed, (ii) probe wall, and (iii) reference wall. In this case, different values for the electric resistance can be obtained for the same particle bed, if the probe or reference walls are different for each computation.

This command uses the functionalities of the enable_electrical_conductivity command and therefore the parameters related to the matrix solver (HYPRE), the definition of the electric resistance of each contact, and so on are also relevant for this command. If those keywords are not set by the user, the default values will be used: see the list of keywords of enable_electrical_conductivity.

Output information

Two different options are available for getting the output of this command: see the example above. The output of this command is automatically written to the file simulation_data_aspherix.csv.

Restrictions

This command always outputs zero at the first iteration after a restart.