SMS:RMA4 Model Control

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RMA4 Model Control dialog showing the General tab

The Model Control Dialog is used to define general, file, and constituents characteristics. The General tab includes options to set up the period of time the model will run, and hydrodynamic and geometry scale factors. The File tab includes the time step used from the RMA2 velocity file and the time subtracted from the RMA2 velocity file, RMA4 Output files options, and Informational Files to be produced when running the model. The Constituents tab includes diffusion coefficient for the constituent, constituent control, and mass check.


Simulation Titles. The RMA4 *.geo file contains three comment lines, which can be set using the Title 1, Title 2, and Title 3 edit fields.

Time control

  • Start time
  • Time Step
  • Total Steps
  • Max. Time

Model Stability

  • Special Calculations

Hydrodynamic Scale Factors

  • X-Velocity scale
  • Y-Velocity scale
  • Depth scale

Geometry Scale Factors

  • X scale
  • Y scale


RMA4 Model Control dialog showing the Files tab

RMA4 Input Files – Time steps from the RMA2 solution file that will be used for the RMA4 simulation.

  • Last time step used from the RMA2 velocity file
  • Time subtracted from the RMA2 velocity file
  • Hotstart Input file
  • Alternate Dynamic BC File

RMA4 Output files – Output files when running RMA4

  • Write Hotstart File
  • Write RMA4 Solution File
    • Write specific time range

Information Files – Files to create when running RMA4

  • Echo card input to screen
  • Write ASCII results file
    • Suppress initial conditions and detailed geometry
    • All input data
    • Suppress detailed geometry
    • Save nodal results every __ time step
    • Subroutine trace
    • Debug trace at level
  • Write summary by node file
  • Write automatically computed parameters file
  • Activate full report


  • Diffusion Coefficient – Diffusion Coefficient Method and Peclet Number Method.
  • Constituent Control – Number of constituents, initial concentration for each of the constituents, and decay coefficient for each coefficient.
  • Mass Check – Mass conservation check.
RMA4 Model Control dialog showing the Constituents tab

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