SMS:CMS-Flow Hot Start

In the CMS-Flow Model Control, the user can specify a previously saved hot start file to be used as initial conditions or instruct CMS-Flow to save hot start files for future use.

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.

• Choosing to write the hot start file at a specific output time will create the following file:
  • hot_start.h5 This file has the simulation data including elevations and velocities.

• Choosing automatic recurring hot start files will create the following files:
  • HOTSTART.INFO This file records what time the hot start file was written and which hot start file is the most recent.
  • HOTSTARTx.H5 (where "x" is a counter) These files have the simulation data including elevations and velocities.

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.

When using a hot start file, the following parameters should be changed as follows:

• Start Date: no change
• Start Time: no change
• Simulation Duration: decrease by the duration of the hot start file
• Boundary Conditions: no change

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.