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. |