SMS:RMA2 Boundary Conditions: Difference between revisions

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==Assigning Boundary Conditions==
==Assigning Boundary Conditions==
Boundary conditions are generally defined on nodestrings but may also be defined on nodes. The default boundary condition is a closed boundary (no flow).  
Boundary conditions are generally defined on nodestrings but may also be defined on nodes or elements. The default boundary condition is a closed boundary (no flow).


==Deleting Boundary Conditions==
==Deleting Boundary Conditions==
Line 6: Line 6:


==Nodal Boundary Conditions==
==Nodal Boundary Conditions==
[[Image:RMA2 Nodal BC.jpg|thumb|350 px|''RMA2 Nodal Boundary Conditions'' dialog]]
[[Image:RMA2 Nodal BC.png|thumb|350 px|''RMA2 Nodal Boundary Conditions'' dialog]]
===Boundary Condition Type===
''Boundary Condition Type''
*''None ''
*''None ''
**''Water Surface Elevation''
**''Water Surface Elevation''
<blockquote style="margin-top:0px; margin-bottom:0px;">A Water surface elevation BC is assigned to this Nodestring. This boundary condition is normally located at the tailwater location. However. RMA2 does sometime edit the water depth at the exit boundary to satisfy the finite element equations. </blockquote>
:::A water surface elevation boundary condition is assigned to the selected nodestring. This boundary condition is normally located at the tailwater location. However. RMA2 does sometime edit the water depth at the exit boundary to satisfy the finite element equations.  
*''Velocity Components''
*''Velocity Components''
*''Unit Flowrate''
*''Unit Flowrate''
*''No Slip Condition''
*''No Slip Condition''


===Boundary Angle===
''Boundary Angle''
*Specify Flow Direction
*Specify Flow Direction
**Perpendicular into Boundary
**Perpendicular into Boundary
Line 21: Line 21:
**Specified angle
**Specified angle


===Optional Parameters===
''Optional Parameters''
*Water Density
*Water Density
*Include in node summary file
*Include in node summary file
===Boundary Condition Value===
 
''Boundary Condition Value''
*Constant
*Constant
*Transient
*Transient


==Nodestring Boundary Conditions==
==Nodestring Boundary Conditions==
[[Image:RMA2 Assign BC.jpg|thumb|500 px|''RMA2 Nodestring Boundary Conditions'' dialog]]
[[Image:RMA2 Assign BC.png|thumb|500 px|''RMA2 Nodestring Boundary Conditions'' dialog]]
=== Boundary Condition Type ===
'' Boundary Condition Type ''
*''None''
*''None''
<blockquote style="margin-top:0px; margin-bottom:0px;">No Boundary Condition is assigned to this Nodestring</blockquote>
::No boundary condition is assigned to this nodestring.
*''Specified Flow Rate''
*''Specified Flow Rate''
<blockquote style="margin-top:0px; margin-bottom:0px;">A flow rate BC is assigned to this nodestring.  It is the most popular way to provide a total flow across a particular continuity line.  The total flow (cubic units per second), flow angle (degrees from positive x-axis) and distribution factor can be specified.</blockquote>
::A flow rate boundary condition is assigned to the selected nodestring.  It is the most popular way to provide a total flow across a particular continuity line.  The total flow (cubic units per second), flow angle (degrees from positive x-axis) and distribution factor can be specified.
<blockquote style="margin-top:0px; margin-bottom:0px;">[[Image:DisFactors.JPG|thumb|none|left|400 px|Lateral distribution of nodal velocities]]</blockquote>
:[[Image:DisFactors.JPG|thumb|none|left|400 px|Lateral distribution of nodal velocities]]
*''Water Surface Elevation''
*''Water Surface Elevation''
<blockquote style="margin-top:0px; margin-bottom:0px;">A Water surface elevation BC is assigned to this Nodestring.  This boundary condition is normally located at the tailwater location.  (However RMA2 does sometime edit the water depth at the exit boundary to satisfy the finite element equations)</blockquote>
::A water surface elevation boundary condition is assigned to the selected nodestring.  This boundary condition is normally located at the tailwater location.  (However RMA2 does sometime edit the water depth at the exit boundary to satisfy the finite element equations.)
*''Reflecting Boundary''
*''Reflecting Boundary''
<blockquote style="margin-top:0px; margin-bottom:0px;">Considered an advanced feature &ndash; for more information see the "Boundary Permeability (Reflection/Absorption)" section on page 99 of the Users Guide to RMA2 version 4.5</blockquote>
::Considered an advanced feature &ndash; for more information see the "Boundary Permeability (Reflection/Absorption)" section on page 99 of the Users Guide to RMA2 version 4.5.
*''Rating Curve''
*''Rating Curve''
<blockquote style="margin-top:0px; margin-bottom:0px;">A Rating curve can also be defined by selecting the '''Options...''' button</blockquote>
::A rating curve can also be defined by selecting the '''Options...''' button.


===Flowrate===
''Flow Rate''
*Constant
*Constant
*Transient
*Transient
===Boundary Reflection===
''Boundary Reflection''
*Steady state water surface
*Steady state water surface
*Tidal storage surface area
*Tidal storage surface area


===Flow Direction===
''Flow Direction''
*Degree CCW from positive X axis
*Degree CCW from positive X axis
*Perpendicular to boundary
*Perpendicular to boundary
===Advanced Options===
 
''Advanced Options''
*Make this nodestring the "Total Flow" nodestring
*Make this nodestring the "Total Flow" nodestring
*Specify vorticity
*Specify vorticity
===Flow Distribution===
 
A real number between 0.0 and 1.0, that is used to weight the nodal x and y velocity components according to the nodal depths and friction across the continuity line.
''Flow Distribution''
:A real number between 0.0 and 1.0, that is used to weight the nodal x and y velocity components according to the nodal depths and friction across the continuity line.
 
==Element Boundary Conditions==
This dialog consists of three tabs.
*''Inflow'' &ndash; Allows assigning inflow to elements. The inflow can either be a constant value or transient.
*''Roughness'' &ndash; Allows overriding global roughness values for the selected elements. A specific roughness value can be entered or roughness by depth can specified.
*''Advanced'' &ndash; Contains options to specify marsh porosity, wind, or rainfall values for the selected element.


==Extract Nodal Boundary Conditions==
==Extract Nodal Boundary Conditions==
[[File:RMA2extractBC.jpg|thumb|300 px|Example of the ''Extract Nodal Boundary Condition'' dialog.]]
[[File:RMA2extractBC.png|thumb|300 px|Example of the ''Extract Nodal Boundary Condition'' dialog.]]
This dialog is reached through the ''RMA2'' | '''Extract Nodal BC''' command. It is only available with dynamic simulations&mdash;defined in the ''RMA2 Model Control'' dialog.
 
*''Boundary Condition Type''
*''Boundary Condition Type''
**"None"
**"None"
Line 71: Line 82:
**''Specified Angle''
**''Specified Angle''
*'''Extract'''
*'''Extract'''
<blockquote style="margin-top:0px; margin-bottom:0px;">
::[[File:RMA2extractBC2.png|thumb|none|left|300 px|Example of the ''Extract Boundary Conditions'' dialog.]]
[[File:RMA2extractBC2.jpg|thumb|none|left|300 px|Example of the ''Extract Boundary Conditions'' dialog.]]
 
</blockquote>
*'''View Extracted'''
*'''View Extracted'''


Latest revision as of 16:33, 25 July 2019

Assigning Boundary Conditions

Boundary conditions are generally defined on nodestrings but may also be defined on nodes or elements. The default boundary condition is a closed boundary (no flow).

Deleting Boundary Conditions

Boundary conditions are removed using the menu command RMA2 | Delete BC.

Nodal Boundary Conditions

RMA2 Nodal Boundary Conditions dialog

Boundary Condition Type

  • None
    • Water Surface Elevation
A water surface elevation boundary condition is assigned to the selected nodestring. This boundary condition is normally located at the tailwater location. However. RMA2 does sometime edit the water depth at the exit boundary to satisfy the finite element equations.
  • Velocity Components
  • Unit Flowrate
  • No Slip Condition

Boundary Angle

  • Specify Flow Direction
    • Perpendicular into Boundary
    • Perpendicular out of Boundary
    • Specified angle

Optional Parameters

  • Water Density
  • Include in node summary file

Boundary Condition Value

  • Constant
  • Transient

Nodestring Boundary Conditions

RMA2 Nodestring Boundary Conditions dialog

Boundary Condition Type

  • None
No boundary condition is assigned to this nodestring.
  • Specified Flow Rate
A flow rate boundary condition is assigned to the selected nodestring. It is the most popular way to provide a total flow across a particular continuity line. The total flow (cubic units per second), flow angle (degrees from positive x-axis) and distribution factor can be specified.
Lateral distribution of nodal velocities
  • Water Surface Elevation
A water surface elevation boundary condition is assigned to the selected nodestring. This boundary condition is normally located at the tailwater location. (However RMA2 does sometime edit the water depth at the exit boundary to satisfy the finite element equations.)
  • Reflecting Boundary
Considered an advanced feature – for more information see the "Boundary Permeability (Reflection/Absorption)" section on page 99 of the Users Guide to RMA2 version 4.5.
  • Rating Curve
A rating curve can also be defined by selecting the Options... button.

Flow Rate

  • Constant
  • Transient

Boundary Reflection

  • Steady state water surface
  • Tidal storage surface area

Flow Direction

  • Degree CCW from positive X axis
  • Perpendicular to boundary

Advanced Options

  • Make this nodestring the "Total Flow" nodestring
  • Specify vorticity

Flow Distribution

A real number between 0.0 and 1.0, that is used to weight the nodal x and y velocity components according to the nodal depths and friction across the continuity line.

Element Boundary Conditions

This dialog consists of three tabs.

  • Inflow – Allows assigning inflow to elements. The inflow can either be a constant value or transient.
  • Roughness – Allows overriding global roughness values for the selected elements. A specific roughness value can be entered or roughness by depth can specified.
  • Advanced – Contains options to specify marsh porosity, wind, or rainfall values for the selected element.

Extract Nodal Boundary Conditions

Example of the Extract Nodal Boundary Condition dialog.

This dialog is reached through the RMA2 | Extract Nodal BC command. It is only available with dynamic simulations—defined in the RMA2 Model Control dialog.

  • Boundary Condition Type
    • "None"
    • "Water surface elevation"
    • "Velocity"
    • "Unit-Flow"
  • Specify Flow Direction
    • Perpendicular info boundary
    • Perpendicular out of boundary
    • Specified Angle
  • Extract
Example of the Extract Boundary Conditions dialog.
  • View Extracted

Related Topics

RMA2

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