# geometry paint-extra command

Syntax

- geometry paint-extra i keyword <range>
Primary keywords:

acceleration acceleration-x acceleration-y acceleration-z condition density displacement displacement-x displacement-y displacement-z extra pore-pressure property property-fluid property-thermal ratio-local saturation strain-increment strain-rate stress stress-strength-ratio stress-effective temperature timestep-dynamic unbalanced-force unbalanced-force-x unbalanced-force-y unbalanced-force-z velocity velocity-x velocity-y velocity-z

“Paint” a scalar value from a zone field. The value is painted onto nodes in the current geometric set. The values are placed in the extra variable index i on each node. The range selects which nodes of the geometric set are painted.

If the value is gridpoint-based, then a value at the node location is calculated using a weighting function inside the zone.

If the value is zone-based, the value will be determined by a curve-fitting algorithm extrapolated to the node location. Which algorithm is used can be specified in the following [zonefieldoptions]. By default a value is considered constant within a zone.

Note that if the need for “painting” is temporary (i.e., for visualization), this can be done on a geometry plot item when plotting — which bypasses the command and the overhead it requires to store the field values at gridpoints. CS: this should have a link to a topic that describes how to do that

- acceleration [zonefieldoptions]
Paint acceleration magnitude at the gridpoint (only available if

`model configure dynamic`

has been specified).

- acceleration-x [zonefieldoptions]
Paint

*x*-acceleration at the gridpoint (only available if`model configure dynamic`

has been specified).

- acceleration-y [zonefieldoptions]
Paint

*y*-acceleration at the gridpoint (only available if`model configure dynamic`

has been specified).

- acceleration-z [zonefieldoptions]
Paint

*z*-acceleration at the gridpoint (only available if`model configure dynamic`

has been specified).

- condition [zonefieldoptions]
Paint a measure of how badly deformed a zone is. [URGENT: CS: content required for link here appears to need adding to doc set: Link to wherever the contents of section 1.1.5 in the Command Reference end up

- density [zonefieldoptions]
Paint the density of the zone.

- displacement [zonefieldoptions]
Paint displacement magnitude at the gridpoint.

- displacement-x [zonefieldoptions]
Paint

*x*-displacement at the gridpoint.

- displacement-y [zonefieldoptions]
Paint

*y*-displacement at the gridpoint.

- displacement-z [zonefieldoptions]
Paint

*z*-displacement at the gridpoint.

- extra [zonefieldoptions]
Paint an extra variable value. The extra variable index used will default to 1 and can be changed with the index modifier keyword. The value will by default come from the zone extra variables, but this can be specified using the source modifier keyword. The value will by default be treated as a scalar floating point type, but this can be specified using the type modifier keyword.

- pore-pressure [zonefieldoptions]
Paint pore pressure in a zone. By default this will be the average zone pore pressure, but the gridpoint pressure can be specified by using the source keyword modifier.

- property [zonefieldoptions]
Paint a property of the mechanical constitutive model of the zone. The property name must be specified using the name keyword modifier. By default it will be assumed the property is a floating point scalar, but this can be specified using the type modifier keyword.

- property-fluid [zonefieldoptions]
Paint a property of the fluid constitutive model of the zone. The property name must be specified using the name keyword modifier. By default it will be assumed the property is a floating point scalar, but this can be specified using the type modifier keyword.

- property-thermal [zonefieldoptions]
Paint a property of the thermal constitutive model of the zone. The property name must be specified using the name keyword modifier. By default it will be assumed the property is a floating point scalar, but this can be specified using the type modifier keyword.

- ratio-local [zonefieldoptions]
Paint the local unbalanced force ratio at each gridpoint. Like all results, this can be changed to the logarithm of the value by using the :lkwd:’log’ keyword modifier.

- saturation [zonefieldoptions]
Paint the saturation at the gridpoint (only available if

`model configure fluid`

has been specified).

- strain-increment [zonefieldoptions]
Paint the strain increment tensor of the zone, determined by the current displacement field. Use the quantity keyword to specify which scalar value to retrieve from the tensor.

- strain-rate [zonefieldoptions]
Paint the strain rate tensor of the zone, determined by the current velocity field. Use the quantity keyword to specify which scalar value to retrieve from the tensor.

- stress [zonefieldoptions]
Paint the stress tensor of the zone, determined by the weighted average of the subzone stresses. Use the quantity keyword to specify which scalar value to retrieve from the tensor.

- stress-strength-ratio [zonefieldoptions]
Paint the ratio of the current stress to a failure surface of the zone, as determined by the current zone constitutive model. Not all constitutive models support this calculation. If unsupported, the value returned will be 10. The value returned is generally held to a maximum of 10.

- stress-effective [zonefieldoptions]
Paint the effective stress tensor of the zone, determined by the weighted average of the subzone stresses minus the zone averaged pore pressure. Use the quantity keyword to specify which scalar value to retrieve from the tensor.

- temperature [zonefieldoptions]
Paint the temperature at the gridpoints. The source modifier keyword can be used to specify that zone based temperature should be used instead.

- timestep-dynamic [zonefieldoptions]
Paint the local critical dynamic time step of that particular gridpoint. (only available if

`model configure dynamic`

has been specified).

- unbalanced-force [zonefieldoptions]
Paint the unbalanced force magnitude at the gridpoint.

- unbalanced-force-x [zonefieldoptions]
Paint the

*x*-unbalanced force at the gridpoint.

- unbalanced-force-y [zonefieldoptions]
Paint the

*y*-unbalanced force at the gridpoint.

- unbalanced-force-z [zonefieldoptions]
Paint the

*z*-unbalanced force at the gridpoint.

- velocity [zonefieldoptions]
Paint the velocity magnitude at the gridpoint.

- velocity-x [zonefieldoptions]
Paint the

*x*-velocity at the gridpoint.

- velocity-y [zonefieldoptions]
Paint the

*y*-velocity at the gridpoint.

- velocity-z [zonefieldoptions]
Paint the

*z*-velocity at the gridpoint.

Block of Common Zone Field Modifier Options

The following modifiers are available to specify additional information for the

`geometry paint-extra`

keywords. The following keywords are available.`acceleration`

,`acceleration-x`

,`acceleration-y`

,`acceleration-z`

,`condition`

,`density`

,`displacement`

,`displacement-x`

,`displacement-y`

,`displacement-z`

,`extra`

,`pore-pressure`

,`property`

,`property-fluid`

,`property-thermal`

,`ratio-local`

,`saturation`

,`strain-increment`

,`strain-rate`

,`stress`

,`stress-effective`

,`stress-strength-ratio`

,`temperature`

,`timestep-dynamic`

,`unbalanced-force`

,`unbalanced-force-x`

,`unbalanced-force-y`

,`unbalanced-force-z`

,`velocity`

,`velocity-x`

,`velocity-y`

and`velocity-z`

.

- component keyword
This keyword selects which scalar to retrieve from a vector type value, such as velocity or displacement. If the value type is not vector, this setting is ignored. The available options are:

- x
Get the

x-component of the vector.

- y
Get the

y-component of the vector

- z
Get the

z-component of the vector

- magnitude
Get the vector magnitude.

- index i
For keywords that require it (most notably extra), this specifies the index that should be used. The default value will be 1.

- gravity b
If on, then gravitational forces are included in the returned applied force. The default is off.

- label s
Assign a label to the history (used in prints and plots).

- log b
If on, the returned number is the base 10 log of the absolute value of the original value. The default is off.

- method
This specifies the method of calculation used to bring zone-based quantities to arbitrary locations in space (including at gridpoint positions).

- constant
Assumes values are constant inside zones. This is the default option. Values at gridpoints or at zone boundaries will pick one adjacent zone to use.

- average
This uses an volume weighted average of all the zones connected to the gridpoint.

- inverse-distance-weight
This uses a weighted average of up to 32 zones in the immediate vicinity of the point. The weighting is determined by a power of the distance of the zone centroid from the specified point.

- power f
Specify the power of the distance used to weight values. The default power is 3.0.

- radius-ratio f
Specify the ratio of the maximum distance from the point of the zones selected, to the ratio used to calculate weighted values. Zones farther from this value are discounted. The default value is 0.75.

- name s
Certain keywords (most notably property) require a name value to be fully specified. This will determine the specific property name retrieved.

- null
Specify the criteria used to ignore zone values. By default mechanical null zones are ignored.

- quantity keyword
This keyword selects which scalar to retrieve from a symmetric tensor type value, such as stress or strain. If the value type is not a tensor, this setting is ignored. The available options are:

- intermediate
Get the intermediate principal stress.

- maximum
Get the maximum (most positive) value of principal stress. [CS: doc needs to be added for this to work in PFC] Note that in -flac3d- ref-compressive stresses are negative <stresssignconventions>-.

- mean
Get the mean pressure value, defined as the trace of the tensor divided by 3. For stresses this is most often referred to as the pressure.

- minimum
Get the minimum (most negative) principal stress. [CS: doc needs to be added for this to work in PFC] Note that in -flac3d- ref-compressive stresses are negative <stresssignconventions>-.

- norm
Get the norm of the strain rate. [CS: again, we need a doc from FLAC3D for this to work in PFC]; see the equation in ref-sec_zonefielddatanames-.

- octahedral
Get octahedral stress. [CS: again, we need a doc from FLAC3D for this to work in PFC]; see the equation in ref-sec_zonefielddatanames-.

- shear-maximum
Get the maximum shear stress.

- total-measure
Get the distance of tensor value to the origin in principal space.

- volumetric
Get the volumetric change, or trace.

- von-mises
Get the Von Mises measure. [CS: again, we need a doc from FLAC3D for this to work in PFC]; see the equation in ref-sec_zonefielddatanames-.

- xx
Get the

xx-component of the tensor.

- xy
Get the

xy-component of the tensor.

- xz
Get the

xz-component of the tensor.

- yy
Get the

yy-component of the tensor.

- yz
Get the

yz-component of the tensor.

- zz
Get the

zz-component of the tensor.

- source keyword
Certain keywords (like extra and pore-pressure) can be retrieved either from the zone structure or from the gridpoint structure. The default value is gridpoint.

- gridpoint
Values are retrieved directly from the gridpoint.

- zone
Values are retrieved from the zone.

- stress b
A few of the tensor type quantity options do different things depending if the value is considered a stress. When coming from a value like extra, this cannot be determined automatically. This allows the user to specify that the incoming tensor value should be considered a stress quantity.

- type keyword
In certain cases the type (scalar, vector, or tensor) of the value cannot necessarily be determined ahead of time. Extra variables, for example, can hold values of all three types. This keyword allows one to specify which type it is assumed to be. If the original value type does not match, 0.0 is returned.

- scalar
Set type to scalar float. This is the default.

- vector
Set type to vector.

- tensor
Set type to tensor.

Was this helpful? ... | PFC 6.0 © 2019, Itasca | Updated: Sep 25, 2020 |