Block Format Keyword This option defines the numerical method for internal force integration. This is relevant
only for brick element and ALE legacy solver (momentum equation solved with
FEM).
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
/ALE/SOLVER/FINT |
Iform |
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Definition
Field |
Contents |
SI Unit
Example |
Iform |
Integration method
(internal force for brick elements) flag.
- = 0
- Set to 3.
- = 1
- Volume integration of the stress tensor using a
shape function.
- = 2
- Surface integration for the hydrostatic stress
tensor only.
- = 3 (Default)
- Surface integration for the stress tensor.
(Real)
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Comments
- Momentum equation has local form:
(1)
Iform is a flag defining the numerical method to
compute
when integrated over the cell with
legacy solver (nodal velocities).
- Iform=1
-
- Was the default method up to Radioss version 2019.
- Iform=2
-
- The integration method used with obsolete card /CAA (Obsolete)
- Iform=3
-
- The integration method used as of Radioss version 2020.
For volume integration, shape functions are used to compute
at node, N:
(2)
Where,
The value
is taken at the integration point. It is
assumed that:
(3)
This assumption is exact for parallelepipedic
shape only, which is why the new default value method is set to surface
integration (Iform=3).