CMS Surface Roller
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The surface roller model is run after each CMS-Wave and before each CMS-Flow run. It runs on the wave grid but is a separate model and module within the CMS. The surface roller model parameters are set within the CMS-Flow cmcmards for convenience. For more information on the surface roller model see the Surface Roller Technical Documentation.
Table 1. CMS-Flow cards related to the surface roller
| Card | Arguments | Range | Default | Description |
|---|---|---|---|---|
| CALC_ROLLER | CHARACTER | /nowiki OFF | OFF | Turns on or off the surface roller model in CMS. |
| ROLLER_DISSIPATION_COEFFICIENT | REA | 0.1 | 0.05-0.15 | Roller dissipation coefficient. |
| ROLLER_EFFICIENCY_COEFFICIENT | REAL | 1.0 | 0.5-1.0 | Roller efficiency coefficient. |
| ROLLER_SCHEME | CHARACTER | /nowikiUPWIND2 nowiki|/nowiki LAX | UPWIND1 | Determines the numerical scheme used for the surface roller calculation. UPWIND1 is a first order upwind scheme, UPWIND2 is a second order upwind scheme, and LAX is the second order Lax scheme. |