FieldQuantity Object

Properties

Methods

Summary

Descriptor of the field quantity applicable to the current problem result

Details

Every FieldQuantity object describes a physical quantity that QuickField can compute analyzing the problem results.

In ActiveField, you access individual FieldQuantity objects as members of related FieldQuantities collections containing all physical quantities accessible in particular context. To access these collections you use your problems Result property that, in its turn, provides several properties of FieldQuantities type.

FieldQuantity object does not represent a fixed value. You could rather see it as a set of parameters QuickField uses to compute either the value of a local quantity at the specified point or the value of an integral quantity calculated by integration over the specified contour. To access the quantity values calculated for a FieldQuantity object, invoke its Calculate method with appropriate arguments.

FieldQuantity properties and methods can be separated into the following groups:

Example:

This Visual Basic code prints the values of all local physical quantities available at the point (x=20, y=10) together with their identification properties (Name, Notation and Unit).

Dim QF As QuickField.Application
Dim res As QuickField.Result
Dim probePoint As QuickField.Point
Dim enm As QuickField.FieldQuantities
Dim q As QuickField.FieldQuantity

Set probePoint = QF.PointXY(20, 10)
Set enm = res.LocalFieldQuantities(probePoint)
For i = 1 To enm.Count
Set q = enm(i)
Debug.Print q.Name & " " & q.Notation _
& " = " & q.Calculate(at:=probePoint).Abs _
& " (" & q.Unit & ")"
Next

The sample prints the following lines:

Potential A = 5.57752323150635 (Wb/m)
Flux Density B = 142.473262940178 (T)
Flux Density Bx = -22.7742176055908 (T)
Flux Density By = -140.641265869141 (T)
Energy Density w = 1615313646.44266 (J/m3)
Strength H = 22675323.2586651 (A/m)
Strength Hx = -3624629.25 (A/m)
Strength Hy = -22383752 (A/m)
Current Density jtotal = 12583421081.543 (A/m2)
Current Density jsource = 29000000000 (A/m2)
Current Density jeddy = -16416578918.457 (A/m2)
Joule Heat Q = 5460085728117.93 (W/m3)
Conductivity g = 29000000 (S)
Permeability mr = 5.00000017567458 ()