FEM EquationElectrostatic/ru

Electricforce equation

Flow equation

FEM

FEM EquationElectrostatic
Системное название
FEM EquationElectrostatic
Расположение в меню
Solve → Equation electrostatic
Верстаки
FEM
Быстрые клавиши
Нет
Представлено в версии
-
См. также
FEM tutorial

В разработке...

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

Usage

1. After adding an Elmer solver as described here, select it in the tree view.
2. Now either use the toolbar button or the menu Solve → Electromagnetic Equations → Electrostatic equation.
3. Change the equation's solver settings or the general solver settings if necessary.

Solver Settings

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

The electrostatic equation provides these special settings:

• ДанныеCalculate Capacitance Matrix: Calculates the capacitance matrix. The matrix contains the point charges of the mesh knots.
• ДанныеCalculate Electric Energy: Calculates the electric potential energy.
• ДанныеCalculate Electric Field: Calculates the electric field.
• ДанныеCalculate Electric Flux: Calculates the electric flux.
• ДанныеCalculate Surface Charge: Calculates the surface charge.
• ДанныеCapacitance Matrix Filename: File in which the capacitance matrix is being saved. It is only used if ДанныеCalculate Capacitance Matrix is set to true.
• ДанныеConstant Weights: If constant weighting for results is used.
• ДанныеPotential Difference: Potential difference in Volt for which the capacitance is calculated. It is only used if ДанныеCalculate Capacitance Matrix is set to false. Therefore in fact this setting specifies the voltage between the electrodes of a simple capacitor. Note that the given voltage has to be consistent with the potentials defined in the boundary conditions.

Analysis Feature Information

The electrostatic equation takes the following analysis features into account if they are set:

• Electrostatic potential boundary condition
• Constant vacuum permittivity

Note

Except for calculations in 2D, for electrostatic potential boundary conditions it is important that they act on a face or body. Boundary conditions in 3D set to lines or vertices are not recognized by the Elmer solver.

Results

The available results depend on the solver settings. If none of the ДанныеCalculate * settings was set to true, only the electric force density and the electric potential are calculated. Otherwise also the corresponding results will be available.

The possible results are:

• Electric energy density in ${\rm {J/m^{3}}}$
• Electric field in ${\rm {V/m}}$
• Electric flux in ${\rm {A\cdot s/m^{2}}}$
• Electric force density in ${\rm {N/m^{2}}}$
• Potential in ${\rm {V}}$
• Potential loads in ${\rm {C}}$

Electricforce equation

Flow equation

FEM

FEM

• FEM Analysis

• Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor

• Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)

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Constraints

• Electromagnetic: Electrostatic potential, Current density, Magnetization

• Fluid: Initial flow velocity, Initial pressure, Flow velocity

• Geometrical: Plane rotation, Section print, Transform

• Mechanical: Fixed, Displacement, Contact, Tie, Spring, Force, Pressure, Centrif, Self weight

• Thermal: Initial temperature, Heat flux, Temperature, Body heat source

• Overwrite Constants: Constant vacuum permittivity

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• Mesh: Mesh Netgen, Mesh GMSH, Mesh boundary layer, Mesh region, Mesh group, Nodes set, Mesh to mesh

• Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run

• Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box

• Utilities: Clipping plane, Remove clipping planes, Open FEM examples; Mesh clear, Mesh display info

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• Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types

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