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Outflow Boundary

Outflow Boundary

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Outflow Boundary

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The Outflow boundary type is used to impose conditions at the domain outlet.

Syntax

OutflowOutlet{ {(X_Velocity = Ux| X_Traction = tx ,

          Y_Velocity = Uy| Y_Traction = ty,

          Z_Velocity = Uz| Z_Traction = tz),

         ([Pressure = Po],)

         (Temperature To | HeatFlux = qout )}

 

Comments

"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 either the Inflow or Outflow boundary.

 

 

See Also:

Boundary Conditions