Example5 Electric Field Created by Point Charge

General

• In this exercise, a point charge is placed in the air.
   

• The electric field created by it is solved and the equipotential map is acquired.
   

• Unless specified in the list below, the default conditions will be applied.
   

Analysis Space

Analysis Conditions

Select “Static analysis” as the potential is static.

The electric field exists outside the analysis region. Therefore the open boundary condition below is applied initially.

As ambient air cannot be created automatically for this model, automatic creation is deselected.

(There are vertex bodies only. Ambient air size is not fixed automatically.)

Model

A solid body represents the air. A vertex body placed in the center of the air represents the point charge.

Body Attributes and Materials

The vertex body is used to set the point charge in the body attribute.

Assign a material to it even though the material property does not affect the simulation.

* Available from the Material DB

Point charge is set in the body attribute.

Boundary Conditions

To set Outer Boundary Condition, go to the [Model] tab
 

and click [Outer Boundary Condition] .

Results

The isosurface contour of the electric potential is shown below.

At Minimum/Maximum Value on the Contour tab of [Graphics Setup], deselect “Automatic” and set 0.5 => 5.0.

The figure shows the equipotential map.