D-R-A-F-T
DD CARD: Effective Diffusion Coefficient By
Equation 64
Optional
Card Description: Effective diffusion may be activated by using the ED, PE, and
DD cards.
Field
Variable
Value Description
0, C 1-2
IC1
DD
Card group identifier.
0,C3
IC3
b/
Option 1 Global: Starting with node = J
T
Option 2 Explicit by material type = J
E
Option 3: Explicit assignment for Element = J
N
Option 4: Explicit assignment for Node = J
1
J
+
Starting or explicit value
≥0
Turbulent exchange coefficient K1 in Eq. 22 (units
2
DK1 (J)
= m2/sec)
<0
Default = 1.0
≥0
3
DK2 (J)
Turbulent exchange coefficient K2 in Eq. 22
<0
Default = 5.0
≥0
4
DK3(J)
Turbulent exchange coefficient K3 in Eq. 22
Default = 10 -5
<0
The DD card uses an equation of the form suggested by Allen Teeter, Coastal and
Hydraulics Laboratory.
Equation 64 simplified
(
)
*
De = Κ 1 Κ 2 D u + 10 -5 λ
2
where
λ
=
the element size
K1 and K2
=
constants
the variables K1, K2 and K3 ( 10 -5 above) are specified.
86 Run Control DD Card
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