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| In the CMS-Flow [[SMS:CMS-Flow Model Control|Model Control]], the user can specify a previously saved hot start file to be used as initial conditions or instruct [[SMS:CMS-Flow|CMS-Flow]] to save hot start files for future use.
| | #redirect [[SMS:CMS-Flow_Files#Hot_Start_File]] |
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| To create a hot start file, either select "Write Hot Start output file" and select an output time, or select "Automatic recurring Hot Start file" and choose an output interval.
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| *Choosing to write the hot start file at a specific output time will create the following file:
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| **''hot_start.h5'' This file has the simulation data including elevations and velocities.
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| *Choosing automatic recurring hot start files will create the following files:
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| **''HOTSTART.INFO'' This file records what time the hot start file was written and which hot start file is the most recent.
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| **''HOTSTARTx.H5'' (where "x" is a counter) These files have the simulation data including elevations and velocities.
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| Once the hot start files are created, they can be read into CMS-Flow. Open the CMS-Flow Model Control and check the "initial conditions file" check box, then select the hot start file you wish to use.
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| When using a hot start file, the following parameters should be changed as follows:
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| *''Start Date'': no change
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| *''Start Time'': no change
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| *''Simulation Duration'': decrease by the duration of the hot start file
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| *''Boundary Conditions'': no change
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| Note: For a simulation using a hot start file, the first time step of the solution will be the start time plus the value of one time step plus the duration of the hot start file.
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