ProductsAbaqus/Aqua TypeModel data LevelModel Optional parameters- INPUT
Set this parameter equal to the name of the alternate input file containing
the data lines for this option. See
Input Syntax Rules
for the syntax of such file names. If this parameter is omitted, it is assumed
that the data follow the keyword line.
- TYPE
Set TYPE=STOKES (default) to use Stokes fifth-order wave theory.
Set TYPE=AIRY to use Airy (linearized) wave theory.
Set TYPE=GRIDDED (Abaqus/Standard
only) to use gridded data to define the fluid particle velocities,
accelerations, free surface elevation, and dynamic pressure.
Set TYPE=USER to allow user-defined waves and update fluid variables like
velocity, acceleration, free surface elevation, pressure, and pressure
gradients.
Optional parameter for TYPE=AIRY- WAVE PERIOD
Include this parameter to indicate that the second field in the data line
specifies the wave period, .
If this parameter is omitted, the second field in the data line specifies the
wavelength, .
Required parameter for TYPE=GRIDDED- DATA FILE
Set this parameter equal to the name of the file containing the gridded
data. The file must be a sequential, binary-format file containing records in
the format described in
Abaqus/Aqua analysis.
Optional parameters for TYPE=GRIDDED- MINIMUM
Set this parameter equal to the elevation below which point the structure is
fully immersed for all time t. If this parameter is
omitted, the elevation of the structure is compared against the instantaneous
free surface to check for fluid surface penetration.
- QUADRATIC
Include this parameter to indicate that quadratic interpolation of the wave
data is used to determine information between grid points. If this parameter is
omitted, linear interpolation is used.
Optional parameter for TYPE=USER- STOCHASTIC
This parameter applies only to
Abaqus/Standard
analyses.
Include this parameter to make the intermediate configuration available to
user subroutine
UWAVE. Set this parameter equal to a random number seed for use
in stochastic analysis. If this parameter is omitted or is included without a
value, a default value of 0.0 is used for the random number seed. This value is
passed into user subroutine
UWAVE. It is not used otherwise by
Abaqus/Aqua.
- PROPERTIES
This parameter applies only to
Abaqus/Explicit
analyses.
Set this parameter equal to the number of constant properties required for
the user-defined wave. The default value is zero. This value is passed into
user subroutine
VWAVE as the integer argument
NPROPS, whereas the property values are passed
in as the real array PROPS.
- DEPVAR
This parameter applies only to
Abaqus/Explicit
analyses.
Set this parameter equal to the number of state variables required for
user-defined waves. The default value is zero. This value is passed into user
subroutine
VWAVE as the integer argument
NSTATEVAR. The state variables are stored at the
nodes of the elements on which the
Abaqus/Aqua
loads are applied and passed into user subroutine
VWAVE as the real array argument
STATEVAR. You must update the state variables in
the user subroutine. They are initialized to zero at the beginning of each
step.
Data line to define
Stokes fifth-order waves (TYPE=STOKES)- First (and
only) line
Wave height, H.
Period of wave, .
Phase angle, ,
in degrees.
Direction cosines giving the direction of travel of the wave,
d. In three-dimensional cases both x-
and y-components are needed; in two-dimensional cases only
the x-component is used (in that case +1 means the wave
travels in the direction of x increasing, and −1 means a
component traveling in the direction of x decreasing).
Data lines to define
Airy waves (TYPE=AIRY)- First
line
Wave component amplitude, .
Wavelength of this component,
(default), or wave period of this component,
(if the parameter WAVE PERIOD is used).
Phase angle of this component, ,
in degrees.
x-direction cosine defining the direction of the vector
(the direction of travel for this wave component). In three-dimensional cases
both x- and y-components are needed;
in two-dimensional cases only the x-component is used (in
that case +1.0 means the wave travels in the direction of
x increasing, and −1.0 means a component traveling in the
direction of x decreasing).
y-direction cosine defining the direction of the vector
(the direction of travel for this wave component). This component is not needed
in two-dimensional cases.
Repeat this data line as often
as necessary to define multiple wave trains; one line per wave
component.
Data line to define
gridded wave data (TYPE=GRIDDED)- First (and
only) line
Global x-coordinate of the origin of the wave data
grid.
Global y-coordinate of the origin of the wave data
grid.
Global z-coordinate of the origin of the wave data
grid.
Direction cosine between the local x-axis of the wave
data grid and the global x-axis. (Plus or minus one for
two-dimensional analysis.)
Direction cosine between the local x-axis of the wave
data grid and the global y-axis. (Zero for two-dimensional
analysis.)
Data lines to define
frequency versus wave amplitude data for stochastic user wave theory (TYPE=USER) in an
Abaqus/Standard
analysis- First
line
Frequency (in cycles per time, for stochastic analysis only).
Wave amplitude.
Repeat this data line as often
as necessary to define the wave spectrum. These data pairs are passed into user
subroutine
UWAVE. They are not used otherwise by
Abaqus/Aqua.
Data lines to define
wave theory (TYPE=USER) in an
Abaqus/Explicit
analysis- First
line
Enter the properties required for the user-defined wave kinematics,
separated by commas. These values will be passed into
VWAVE as the real-array argument
PROPS.
Repeat this data line as often
as necessary to include all properties, with a maximum of eight values per
line.
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