Manufacturing Solutions

# Boundary Conditions

The Outflow boundary type is used to impose conditions at either end of the billet.

Syntax

Outflow Outlet {

X_Velocity = Ux | X_Traction = tx

Y_Velocity = Uy | Y_Traction = ty

Z_Velocity = Uz | Z_Traction = tz

Pressure = Po

Temperature = To | HeatFlux = qout

}

• | "Outlet" is the name of the user-specified outflow boundary. |

• | For each component of the momentum equation, you must specify either the velocity or the tractions. |

• | The X_Velocity, Y_Velocity, and Z_Velocity entities specify the primary degrees of freedom for each component of the momentum equation. |

• | The X_Traction, Y_Traction, and Z_Traction entities specify the secondary degrees of freedom. Pressure is specified only if tractions are imposed. |

• | Either Temperature or HeatFlux is specified for the energy equation when solving non-isothermal flows. |

• | The velocities, tractions, pressure, temperatures, and heat fluxes can be input as a function of space and time. |

Valid data types for each field are given in the following table:

## Variable Name |
## Description |
## Valid Data Types |

Velocity (Ui) |
Velocity component (i=x,y,z) |
CONSTANT, EXPRESSION f(x,y,z,t) |

Traction (ti) |
Traction component (i=x,y,z) |
CONSTANT, EXPRESSION f(x,y,z,t) |

Pressure (P) |
Static pressure |
CONSTANT, EXPRESSION f(x,y,z,t) |

Temperature (T) |
Static temperature |
CONSTANT, EXPRESSION f(x,y,z,t) |

HeatFlux (q) |
Magnitude of surface heat flux |
CONSTANT, EXPRESSION f(x,y,z,t) |

Note: | Pressure must be specified on at least one element face of Outflow boundary. |

• | ClampSurface BC is used to impose conditions on the surface of the billet that comes in contact with manipulator/clamp at each end of the workpice. |

• | There will be two ClampSurface BCs to represent clamp locations on either end of the billet. |

Syntax

ClampSurface LeftClamp {

Temperature = To (or)

HeatFlux = qout (or)

ConvCoeff = h

ConvTref = Tref

IsActive = 0 (or) 1

Location = “Left” (or) “Right”

}

Comments

• | While solving non-isothermal flows, either Temperature or HeatFlux or Convection boundary condition is specified for the energy equation. |

• | IsActive – specifies whether the clamp is idle or holding the billet |

• | Location – specifies the location of the clamp with respect to the billet assuming it is oriented in the positive Z-Axis direction |

Syntax

PunchContact Punchsurface {

Temperature = To (or)

HeatFlux = qout (or)

ConvCoeff = h

ConvTref = Tref

}

Comments

• | While solving non-isothermal flows, either Temperature or HeatFlux or Convection boundary condition is specified for the energy equation. |