`model solve`

command

Syntax

- model solve keyword ...
Primary keywords:

and calm clock convergence creep cycles cycles-super cycles-total dynamic elastic fish-call fish-halt fluid mechanical or ratio ratio-average ratio-local ratio-maximum syncronize thermal time time-total time-total-zone unbalanced-average unbalanced-maximum

Solve to a specified limit. The solve logic provides a mechanism to continue cycling a model until specified criteria are met, oftentimes resulting in a model that is in equilibrium to some tolerance. Any combination of the keywords below can be given in a single model.solve command.

Note

If multiple solve limits are given, then cycling will continue until one of the limits is met, unless the and keyword is used, in which case

*all*criteria must be met before cycling stops.- and
Specify that when multiple solve limits are given, all must be met before cycling is stopped. The default behavior is to stop once

*any*solve limit is met.

- calm i
Specify that every i cycles, the model will be calmed. For mechanical processes, all velocities (both linear and angular) that are not fixed are nulled during a

`calm`

.

- convergence f
Limit based on the maximum convergence value of all gridpoints, zones, structural nodes, balls, clumps, or rigid blocks. The convergence value is defined as the ratio of the current mechanical force ratio to the target force ratio of the gridpoint. See the

`zone gridpoint initialize ratio-target`

and`structure node initialize ratio-target`

commands. A convergence value of 1.0 is therefore considered “converged”, but it is possible to restrict or relax that by using a value greater or less than 1.0.

- creep keyword
Specify a solve limit for the creep process specifically.

- cycles i
Limit of the number of cycles to take with creep active during this solve operation.

- cycles-total i
Total number of cycles taken with creep active since model creation.

- cycles-total-zone i
Total number of cycles taken with creep active in the zone module.

- time f
Limit of the time accumulated while this process is active during this solve operation.

- time-total f
Limit of the time accumulated while this process is active since model creation.

- time-total-zone f
Total accumulated creep time in the zone module.

- cycles i
Synonym to

`model cycle`

.

- cycles-super i
A solve limit based on the number of “Super-Cycles” taken during the current solve command. One “Super-Cycle” cycle includes all leader and follower steps taken as part of a loosely coupled solve system.

- cycles-total i
A solve limit based on the total number of accumulated cycles.

- dynamic
Specify a solve limit for the dynamic process specifically.

- cycles i
Limit of the number of cycles to take with dynamic active during this solve operation.

- cycles-total i
Total number of cycles taken with dynamic active since model creation.

- cycles-total-zone i
Total number of cycles taken with dynamic active in the zone module.

- time f
Limit of the time accumulated while this process is active during this solve operation.

- time-total f
Limit of the time accumulated while this process is active since model creation.

- time-total-zone f
Total accumulated dynamic time in the zone module.

- elastic <only>
Perform a mechanical calculation in two steps: first, assuming elastic behavior; then, using the actual strength values of the material. The cohesion and tensile strength for all materials in the model are set to high values for the first step. For the second step, the cohesion and tensile strength are reset to their original values. If the optional only keyword is provided, then only the elastic portion (i.e., the first step) is undertaken. This keyword only applies to the mechanical process.

- fish-call f s <keyword>
Add the FISH function s to the Fish-Call list at location f, as with the

`fish callback`

command. See the section FISH Callback Events for a discussion of FISH callbacks. The following keywords are available to reduce the frequency of the callback.- process keyword
If specified, then the function will only be called if the process indicated is active during that particular cycle.

- creep
The callback will only execute if the creep and mechanical process is active

- dynamic
The callback will only execute if the dynamic and mechanical process is active

- fluid
The callback will only execute if the fluid process is active

- mechanical
The callback will only execute if the mechanical process is active

- thermal
The callback will only execute if the thermal process is active

- fish-halt s
The FISH function s is called during every cycle to determine whether cycling should continue. If s returns false, cycling continues; otherwise, cycling terminates.

- fluid keyword
Specifies a solve limit for the fluid process specifically.

- cycles i
Limit of the number of cycles to take with fluid-flow active during this solve operation.

- cycles-total i
Total number of cycles taken with fluid-flow active since model creation.

- cycles-total-zone i (valid only if FLAC zones exist)
Total number of cycles taken with fluid-flow active in the zone module.

- ratio-flow f (FLAC3D only)
Specifies a limiting convergence ratio as defined by the fluid-flow logic. See section xxx of the fluid discussion — CS on 3/7/17 still don’t know where this should go

- time f
Limit of the time accumulated while this process is active during this solve operation.

- time-total f
Limit of the time accumulated while this process is active since model creation.

- time-total-zone f (valid only if FLAC zones exist)
Total accumulated dynamic time in the zone module.

- mechanical keyword
Specifies a solve limit for the mechanical process specifically.

- convergence f
Limit based on the maximum convergence value of all gridpoints and zones in the model (note that currently PFC balls do not support this keyword). The convergence value for a gridpoint or node is defined as the ratio of the current mechanical force ratio to the target force ratio of the gridpoint. See the

`zone gridpoint initialize ratio-target`

and`structure node initialize ratio-target`

commands. A convergence value of 1.0 is therefore considered “converged”, but it is possible to restrict or relax that by using a value greater or less than 1.0.

- cycles i
Limit of the number of cycles to take with mechanical active during this solve operation.

- cycles-total i
Total number of cycles taken with mechanical active since model creation.

- cycles-total-zone i
Total number of cycles taken with mechanical active in the zone module.

- ratio f
Limit based on the current convergence ratio value, as defined by the various modules that use it. By default this is the same as ratio-average. See ref-equilibrium-.

- ratio-average f
Limited based on the average convergence ratio. See ref-equilibrium-.

- ratio-local f
Limited based on the local convergence ratio. See ref-equilibrium-.

- ratio-maximum f
Limited based on the maximum convergence ratio. See ref-equilibrium-. CS: Common trouble

- time f
Limit of the time accumulated while this process is active during this solve operation.

- time-total f
Limit of the time accumulated while this process is active since model creation.

- time-total-zone f
Total accumulated mechanical time in the zone module.

- unbalanced-maximum f
Limit based on the maximum unbalanced force among model objects.

- or
Specify that when multiple solve limits are set, cycling should stop when any one limit is met. This is the default behavior.

- ratio f
Limit based on the convergence ratio returned by all active modules.

- ratio-average f
Limit based on the average convergence ratio returned by all active modules.

- ratio-local f
Limit based on the local convergence ratio returned by all active modules.

- ratio-maximum f
Limit based on the maximum convergence ratio returned by all active modules.

- syncronize
In a typical loosely coupled analysis (most commonly fluid-mechanical) the leader process (fluid) takes one or more cycles and then the follower process (mechanical) cycles to equilibrium. In some cases both processes have timesteps that are meaningful (fluid-thermal coupling, fluid-creep, etc). In which case you can use the synchronize keyword. In this case the follower process(es) will not solve to equilibrium but will instead cycle until the accumulated time matches the time in the leader process.

- thermal keyword
Specifies a solve limit for the thermal process specifically.

- cycles i
Limit of the number of cycles to take with thermal active during this solve operation.

- cycles-total i
Total number of cycles taken with thermal active since model creation.

- cycles-total-zone i
Total number of cycles taken with thermal active in the zone module.

- ratio f
Specifies a limiting convergence ratio as defined by the thermal logic.

- ratio-local f
Specifies a limiting local convergence ratio as defined by the thermal logic.

- time f
Limit of the time accumulated while this process is active during this solve operation.

- time-total f
Limit of the time accumulated while this process is active since model creation.

- time-total-zone f
Total accumulated dynamic time in the zone module.

- time f
Cycle until the total time accumulated by any active process after the initiation of the solve meets or exceeds f. This is distinct from the time-total keyword that refers to the total age of the process.

- time-total f
Cycle until the total age of any active process meets or exceeds f. This is distinct from the time keyword.

- time-total-zone f
Cycle until the total age of any active process in a zone module meets or exceeds f. This is distinct from the time keyword.

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