Home / Examples / Electric Analysis [Coulomb] / Example 6: Electric Field Created by Spherical Charge

Example 6: Electric Field Created by Spherical Charge

In this example, a spherical charge is placed in the air.
The electric field generated by it is solved and the equipotential map is acquired.
Unless specified in the list below, the default conditions will be applied.
Obtain this session's project file. (Right-click and choose 'Save link as')

Select [Static Analysis] as the electric potential is static.

Item	Settings
Solver	Electric Analysis [Coulomb]
Analysis Type	Static Analysis (Capacitance)
Options	N/A

Air domain scale in this example is a bit larger than the default setting.

Tab

Setting Item

Settings

Mesh Tab

Air Domain Creation

Create air domain automatically: Select

Air Domain Scale: 5.0

In actuality, the electric field exists outside the analysis domain. Therefore the open boundary condition below is applied initially.

A sphere to represent the spherical charge is placed inside the cube.

Body Number/Type	Body Attribute Name	Material Name
1/Solid	Sphere	000_Air(*)

* Available from the material DB

Charge is set in the body attribute.

Body Attribute Name	Charge
Sphere	Charge Density: Electric Charge ×10-3 [C/m3]

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
Outer Boundary Condition *	Electric	Open Boundary

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

and click [Outer Boundary Condition] .

[Results]

The figure below shows the gradation contour of the electric potential on the Z=0 plane.

The electric potential map around the charge is well presented visually.

The electric potential at the spherical center is the highest.