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Boundary Conditions |
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Boundary Conditions |
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»Click here to display Table of Contents«
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Boundary Conditions |
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Boundary Conditions |
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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. |