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exa
docs
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3964f5a6
Commit
3964f5a6
authored
5 years ago
by
Ann Almgren
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Merge branch 'master' of
https://github.com/AMReX-Codes/MFIX-Exa
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docs/source/InputsTimeStepping.rst
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Time Stepping
Time Stepping
=============
=============
The following inputs must be preceded by "
amr
." Note that if both are specified, both criteria
The following inputs must be preceded by "
mfix
." Note that if both are specified, both criteria
are used and the simulation still stop when the first criterion is hit. In the case of unsteady flow,
are used and the simulation still stop when the first criterion is hit. In the case of unsteady flow,
the simulation will stop when either the number of steps reaches max_step or time reaches stop_time.
the simulation will stop when either the number of steps reaches max_step or time reaches stop_time.
In the case of unsteady flow, the simulation will stop when either the tolerance (difference between
In the case of unsteady flow, the simulation will stop when either the tolerance (difference between
subsequent steps) is reached or the number of iterations reaches the maximum number specified.
subsequent steps) is reached or the number of iterations reaches the maximum number specified.
+------------------+-----------------------------------------------------------------------+-------------+-----------+
| | Description | Type | Default |
+==================+=======================================================================+=============+===========+
| max_step | Maximum number of time steps to take | Int | -1 |
+------------------+-----------------------------------------------------------------------+-------------+-----------+
| stop_time | Maximum time to reach | Real | -1.0 |
+------------------+-----------------------------------------------------------------------+-------------+-----------+
The following inputs must be preceded by "mfix."
+----------------------+-----------------------------------------------------------------------+-------------+--------------+
+----------------------+-----------------------------------------------------------------------+-------------+--------------+
| | Description | Type | Default |
| | Description | Type | Default |
+======================+=======================================================================+=============+==============+
+======================+=======================================================================+=============+==============+
| max_step | Maximum number of time steps to take | Int | -1 |
+----------------------+-----------------------------------------------------------------------+-------------+--------------+
| stop_time | Maximum time to reach | Real | -1.0 |
+----------------------+-----------------------------------------------------------------------+-------------+--------------+
| fixed_dt | Should we use a fixed timestep? | Int | 0 |
| fixed_dt | Should we use a fixed timestep? | Int | 0 |
+----------------------+-----------------------------------------------------------------------+-------------+--------------+
+----------------------+-----------------------------------------------------------------------+-------------+--------------+
| cfl | CFL constraint (dt < cfl * dx / u) if fixed_dt not 1 | Real | 0.5 |
| cfl | CFL constraint (dt < cfl * dx / u) if fixed_dt not 1 | Real | 0.5 |
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