CMS-Flow Model Parameters
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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.
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. |
Time Control
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. |
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 | Function of grid size | >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). |
| MATRIX_SOLVER | CHARACTER | GMRES | GAUSS-SEIDEL | GAUSS-SEIDEL-SOR | BICGSTAB | GMRES | Selects the matrix solver for flow, sediment and salinity. |
| ADVECTION_SCHEME | CHARACTER | EXPONENTIAL | NONE | HYBRID | EXPONENTIAL | HLPA | Sets the advection scheme for flow, sediment and salinity. |