Donate

Elasticity equation

Электростатическое уравнение

FEM

Description

This equation describes the electrostatic force acting on a surface.

For info about the math of the equation, see the Elmer models manual, section Electrostatic force.

Usage

1. Add an Elmer solver.
2. Select it in the Tree view.
3. There are several ways to invoke the command:
   • Press the Electricforce equation button.
   • Select the Solve → Electromagnetic Equations → Electricforce equation option from the menu.
4. The electricforce equation needs a potential field:
   • Invoke the FEM EquationElectrostatic command.
5. Change the equation's solver settings or the general solver settings if necessary.

The electricforce equation only calculates the force for faces with a electrostatic potential boundary condition if the boundary condition's option Calculate Electric Force is used.

Solver Settings

For the general solver settings, see the Elmer solver settings.

The electricforce equation provides this special setting:

• ДанныеExec Solver: By default the equation is only solved after a time step passed. This means it is first solved after the solution of other equations converged. When the setting is Always the equation is solved after every iteration within a time step. (For steady-state simulations the whole simulation is one time step.)

Analysis Feature Information

The electricforce equation does not have its own analysis features. It takes the electrostatic potential boundary condition from the Electrostatic equation. In the boundary condition it is important to use the option Calculate Electric Force.

Result

The result is the electric force density in ${\displaystyle {\rm {N/m^{2}}}}$.

Elasticity equation

Электростатическое уравнение

FEM