ActiveField™ Help

Main QuickField Site     Free Downloads     Contacts

ActiveField Technology
What's New
Objects Overview
Hierarchy Chart
How to Start: Application Object
How to work with Problems
How to work with Model
How to work with Data
How to Analyze Results

Objects

Properties

Methods

FieldPoint Object

Properties

Methods

Summary

Local field data in the given point.

Details

The FieldPoint object represents field data in the given point. Usually you get a FieldPoint object by the GetLocalValues method of the Result object. When you are working with the TableWindow object, you get a FieldPoint object for the table row using the Value of the TableRow object.

The FieldPoint object represents the field quantities that are common for all kinds of problem. However some problem types offers the most specific field quantities. These are contained in specific FieldPoint based objects: FieldPointES for electrostatic problems, FieldPointHE for AC magnetics (time-harmonic) problems and FieldPointSA for stress analysis problems. All of the specific FieldPoint** objects are based on the general FieldPoint object and inherits all its properties.

All of the FieldPoint object's properties are read-only.

Properties

Potential

The potential for which the Poisson equations are formulated.

Grad

Gradient of the potential as a two component vector

KGrad

The vector that is calculated as Grad (Potential) * K (see below).

K

Two component tensor that represents the coefficient in the left part of the Poisson equation

Energy

One halve of the scalar product of Grad and KGrad. For the most of problems that value is equal to local density of the field energy.

The table below clarifies the exact meaning of these general quantities for each type of problem. The scalar quantities have type Double, vector quantities are presented by type Point.

 

Potential

Grad

KGrad

K

Energy

Electrostatics

Scalar electric potential U (voltage) in (V)

Vector of electric field intensity E in (V/m)

Vector of electric displacement D in (C/m2)

Dielectric permittivity (absolute) in (F/m)

Electric field energy density in (J/m3)

Magnetostatics
(DC magnetics)

Vector magnetic potential A (one component) in (Wb/m)

Vector of magnetic flux density B in (T)

Vector of magnetic field intensity in (A/m)

Reciprocal magnetic permeability (absolute) in (H/m)

Magnetic field energy density in (J/m3)
For nonlinear problems linearized part of the energy.

AC magnetics*

Vector magnetic potential A in (Wb/m)

Vector of magnetic flux density B in (T)

Vector of magnetic field intensity in (A/m)

Reciprocal Magnetic permeability (absolute) in (H/m)

Magnetic field energy density in (J/m3)

DC conduction analysis

Scalar electric potential U (voltage) in (V)

Vector of electric field intensity E (V/m)

Vector of current density in (A/m2)

Electric conductivity in (S/m)

Specific power of Joule heat in (J/m3)

Heat transfer problems

Temperature (K)

Temperature gradient in (K/m)

Vector of thermal flux density in (W/m2)

Thermal conductivity in (W/K·m)

no physical sense

Strain and stress analysis

Modulus of the displacement vector (in length units)

Vector build of the normal components of the strain tensor

Vector build of the normal components of the stress tensor in (N/m2)

Young's modulus in (N/m2)

no physical sense

* For time harmonic problems all the field quantities are complex. Nevertheless the FieldPoint's properties are real. They are calculated as peak, root mean square (RMS) or momentary values depending upon the mode chosen for corresponding FieldPicture. You can obtain also complex values using the FieldPointHE object.