Documentation du code de simulation numérique SUNFLUIDH

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Example of border boundary conditions

Example of border boundary conditions

This example is defined for a 2D geometrical configuration. The size of the domain is $1.5 \times 1.0.$
An inlet is located at the down left side of the domain.
An outlet is located at the top right side of the domain.
A symmetrical plan is located at the bottom of the domain (Y=0)

We remind the user the domain is enclosed by default. Wall boundary conditions are implicitly defined at the ends of the domain.
The inlet and the outlet are built from the namelists Inlet_Boundary_Condition and Outlet_Boundary_Condition, respectively.
These boundary conditions replace the wall boundary conditions (default) over the areas defined in the namelists.
The inlet and outlets boundary conditions are presented herein for the sake of clarity.
The border boundary condition in accordance with the described configuration are shown just after the inlet/outlet conditions.

Inflow data

The flow is homogeneous (no multi-species gas)
Conditions are constant in time

 &Inlet_Boundary_Conditions
 Type_of_BC= "INLET", Direction_Normal_Plan= 1 ,
 Plan_Location_Coordinate= 0.0   ,
 Start_Coordinate_of_First_Span = 0.0, End_Coordinate_of_First_Span = 0.5,
 Start_Coordinate_of_Second_Span= 0.0  , End_Coordinate_of_Second_Span= 0.0 ,
 Flow_Direction= 1 ,
 Normal_Velocity_Reference_Value= 1.0  , 
 Temperature_Reference_Value= 293.0 ,   
 Density_Reference_Value=  1.2,
 Define_Velocity_profile= 0 /

Outflow data

The outflow is based on the mass flowrate conservation.
The normal pressure gradient is zero (Neumann boundary condition).

&Outlet_Boundary_Conditions

 Type_of_BC= "OUTLET", Direction_Normal_Plan= 1 ,
 Plan_Location_Coordinate= 1.5   ,
 Start_Coordinate_of_First_Span = 0.5    , End_Coordinate_of_First_Span = 1.0 ,
 Start_Coordinate_of_Second_Span= 0.0    , End_Coordinate_of_Second_Span= 0.0 ,
 Flow_Direction= 1 /

Border boundary conditions

The “BACK” end of the domain must be a symmetric plan.
The other ends of the domain must be unchanged :
- WEST : Inlet + Wall (by default West_BC_Name= “None”)
- EAST : Outlet + Wall (by default East_BC_Name= “None”)
- FRONT : Wall (the default boundary condition not modified, (by default Front_BC_Name= “None”))

 &Border_Domain_Boundary_Conditions  Back_BC_Name= "Symmetric" /

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