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.

Related Topics

• CMS-Flow