Figure 1. CMS-Flow Model Control : Model Parameters tab in SMS 11.0.
All of the CMS-Flow model parameters, settings, and output options are controlled from the CMS-Flow Model Control window (Figure 1). The window has several tabs including the Flow tab in which most of the general settings are set for CMS-Flow. To open the CMS-Flow Model Control window, click on CMS-Flow | Model Control. The first tab will be the Flow tab. There are several sections within the tab including Time Control and Hot Start options.
Below are some of the CMS cards related to the Time Control of the Flow tab. Table 1 provides a brief description of the CMS cards used for time control.
Card
Arguments
Default
Range
Description
STARTING_JDATE
REAL
none
none
Julian data in YYDDD with YY being last two digits of the year, and DDD the Julian day of the year.
STARTING_JDATE_HOUR
REAL
none
none
Julian hour .
HYDRO_TIME_STEP
REAL
Calculated based on solution scheme and courant number
none
Sets to the time step for hydrodynamics in seconds.
DURATION_RUN
REAL
48.0
>RAMP>0
Sets the duration of the model simulation in hours.
DURATION_RAMP
REAL
1.0
Sets the length of the ramp period in which the model forcing is slowly ramped from zero.
Hot Start
Card
Arguments
Default
Range
Description
INITIAL_STARTUP_FILE
CHARACTER
none
none
Julian data in YYDDD with YY being last two digits of the year, and DDD the Julian day of the year.
HOT_START_OUTPUT_FILE
CHARACTER
none
none
Julian hour.
HOT_START_TIME
REAL
none
none
Sets the hot start output time.
AUTO_HOT_START_INTERVAL
REAL
none
none
Sets the recurring hot start output time.
General Parameters
Card
Arguments
Default
Range
Description
WATER_DENSITY
REAL
none
none
Julian data in YYDDD with YY being last two digits of the year, and DDD the Julian day of the year.
WATER_TEMPERATURE
REAL
none
none
Julian hour .
DRYING_DEPTH
REAL
Calculated based on solution scheme and courant number
none
Sets to the time step for hydrodynamics in seconds.
SOLUTION_SCHEME
REAL
48.0
>RAMP>0
Sets the duration of the model simulation in hours.
DURATION_RAMP
REAL
1.0
Sets the length of the ramp period in which the model forcing is slowly ramped from zero.
Advanced Options
Card
Arguments
Default
Range
Description
WATER_PONDING
CHARACTER
OFF
ON | OFF
Turns On or Off water ponding. If water ponding is Off, isolated bodies of water will become dry.
ONE_CELL_WIDE_CHANNELS
CHARACTER
ON
ON | OFF
Limits wetting and drying to areas with at least 3 cells wide. When turned off, the model stability is improved.
HYDRO_MAX_ITERATIONS
INTEGER
20
>0
Sets the maximum number of iterations for the flow (hydro) solver (outer loop).
PRESSURE_ITERATIONS
INTEGER
Depends on Solver
>0
Sets the number of solver iterations for the pressure equation (inner loop).
VELOCITY_ITERATIONS
INTEGER
Depends on Solver
>0
Sets the number of solver iterations for the velocity or momentum equations (inner loop).
