Example6 Electric Field Created by Spherical Charge

In this exercise, a spherical 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.

Select “Static analysis” as the potential is static.

Item	Settings
Solver	Electric Field Analysis [Coulomb]
Analysis Type	Static analysis
Material Type	Dielectric material
Options	N/A

Ambient air scale in this Exercise is a bit larger than the default setting.

Tab

Setting Item

Settings

Mesh Tab

Ambient Air Creation

Create ambient air automatically: Select

Ambient Air Scale: 5.0

The electric field exists outside the analysis region. 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: Charge Density 1×10^-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 potential on the Z=0 plane.

The potential map around the charge is well presented visually.

The potential at the spherical center is the highest.